A supernova is a stellar explosion that is more energetic than a nova. It is pronounced // with the plural supernovae // or supernovas. Supernovae are extremely luminous and cause a burst of radiation that often briefly outshines an entire galaxy, before fading from view over several weeks or months. During this short interval a supernova can radiate as much energy as the Sun is expected to emit over its entire life span. The explosion expels much or all of a star's material at a velocity of up to 30,000 km/s (10% of the speed of light), driving a shock wave into the surrounding interstellar medium. This shock wave sweeps up an expanding shell of gas and dust called a supernova remnant.
Nova (plural novae) means "new" in Latin, referring to what appears to be a very bright new star shining in the celestial sphere; the prefix "super-" distinguishes supernovae from ordinary novae, which also involve a star increasing in brightness, though to a lesser extent and through a different mechanism. The word supernova was coined by Swiss astrophysicist and astronomer Fritz Zwicky, and was first used in print in 1926. Several types of supernovae exist. Types I and II can be triggered in one of two ways, either turning off or suddenly turning on the production of energy through nuclear fusion. After the core of an aging massive star ceases generating energy from nuclear fusion, it may undergo sudden gravitational collapse into a neutron star or black hole, releasing gravitational potential energy that heats and expels the star's outer layers. Alternatively a white dwarf star may accumulate sufficient material from a stellar companion (either through accretion or via a merger) to raise its core temperature enough to ignite carbon fusion, at which point it undergoes runaway nuclear fusion, completely disrupting it. Stellar cores whose furnaces have permanently gone out collapse when their masses exceed the Chandrasekhar limit, while accreting white dwarfs ignite as they approach this limit (roughly 1.38 times the solar mass). White dwarfs are also subject to a different, much smaller type of thermonuclear explosion fueled by hydrogen on their surfaces called a nova. Solitary stars with a mass below approximately 9 solar masses, such as the Sun, evolve into white dwarfs without ever becoming supernovae.
Although no supernova has been observed in the Milky Way since 1604, supernovae remnants indicate on average the event occurs about once every 50 years in the Milky Way. They play a significant role in enriching the interstellar medium with higher mass elements. Furthermore, the expanding shock waves from supernova explosions can trigger the formation of new stars.
- 1 Observation history
- 2 Discovery
- 3 Naming convention
- 4 Classification
- 5 Current models
- 6 Interstellar impact
- 7 Milky Way candidates
- 8 See also
- 9 Notes
- 10 References
- 11 Further reading
- 12 External links
Hipparchus' interest in the fixed stars may have been inspired by the observation of a supernova (according to Pliny). The earliest recorded supernova, SN 185, was viewed by Chinese astronomers in 185 AD. The brightest recorded supernova was the SN 1006, which was described in detail by Chinese and Islamic astronomers. The widely observed supernova SN 1054 produced the Crab Nebula. Supernovae SN 1572 and SN 1604, the latest to be observed with the naked eye in the Milky Way galaxy, had notable effects on the development of astronomy in Europe because they were used to argue against the Aristotelian idea that the universe beyond the Moon and planets was immutable. Johannes Kepler began observing SN 1604 on October 17, 1604. It was the second supernova to be observed in a generation (after SN 1572 seen by Tycho Brahe in Cassiopeia).
Since the development of the telescope the field of supernova discovery has extended to other galaxies, starting with the 1885 observation of supernova S Andromedae in the Andromeda galaxy. Supernovae provide important information on cosmological distances. During the twentieth century successful models for each type of supernova were developed, and scientists' comprehension of the role of supernovae in the star formation process is growing[update]. American astronomers Rudolph Minkowski and Fritz Zwicky developed the modern supernova classification scheme beginning in 1941.
In the 1960s astronomers found that the maximum intensities of supernova explosions could be used as standard candles, hence indicators of astronomical distances. Some of the most distant supernovae recently observed appeared dimmer than expected. This supports the view that the expansion of the universe is accelerating. Techniques were developed for reconstructing supernova explosions that have no written records of being observed. The date of the Cassiopeia A supernova event was determined from light echoes off nebulae, while the age of supernova remnant RX J0852.0-4622 was estimated from temperature measurements and the gamma ray emissions from the decay of titanium-44. In 2009 nitrates were discovered in Antarctic ice deposits that matched the times of past supernova events.
Early work on what was originally believed to be simply a new category of novae was performed during the 1930s by Walter Baade and Fritz Zwicky at Mount Wilson Observatory. The name super-novae was first used in a 1931 lecture at Caltech by Zwicky, then used publicly in 1933 at a meeting of the American Physical Society. By 1938, the hyphen had been lost and the modern name was in use.
Because supernovae are relatively rare events within a galaxy, occurring about once every 50 years in the Milky Way, obtaining a good sample of supernovae to study requires regular monitoring of many galaxies.
Supernovae in other galaxies cannot be predicted with any meaningful accuracy. Normally, when they are discovered, they are already in progress. Most scientific interest in supernovae—as standard candles for measuring distance, for example—require an observation of their peak luminosity. It is therefore important to discover them well before they reach their maximum. Amateur astronomers, who greatly outnumber professional astronomers, have played an important role in finding supernovae, typically by looking at some of the closer galaxies through an optical telescope and comparing them to earlier photographs.
Towards the end of the 20th century astronomers increasingly turned to computer-controlled telescopes and CCDs for hunting supernovae. While such systems are popular with amateurs, there are also professional installations such as the Katzman Automatic Imaging Telescope. Recently the Supernova Early Warning System (SNEWS) project has begun using a network of neutrino detectors to give early warning of a supernova in the Milky Way galaxy. Neutrinos are particles that are produced in great quantities by a supernova explosion, and they are not significantly absorbed by the interstellar gas and dust of the galactic disk.
Supernova searches fall into two classes: those focused on relatively nearby events and those looking for explosions farther away. Because of the expansion of the universe, the distance to a remote object with a known emission spectrum can be estimated by measuring its Doppler shift (or redshift); on average, more distant objects recede with greater velocity than those nearby, and so have a higher redshift. Thus the search is split between high redshift and low redshift, with the boundary falling around a redshift range of z = 0.1–0.3—where z is a dimensionless measure of the spectrum's frequency shift.
High redshift searches for supernovae usually involve the observation of supernova light curves. These are useful for standard or calibrated candles to generate Hubble diagrams and make cosmological predictions. Supernova spectroscopy, used to study the physics and environments of supernovae, is more practical at low than at high redshift. Low redshift observations also anchor the low-distance end of the Hubble curve, which is a plot of distance versus redshift for visible galaxies. (See also Hubble's law).
Supernova discoveries are reported to the International Astronomical Union's Central Bureau for Astronomical Telegrams, which sends out a circular with the name it assigns to that supernova. The name is the marker SN followed by the year of discovery, suffixed with a one or two-letter designation. The first 26 supernovae of the year are designated with a capital letter from A to Z. Afterward pairs of lower-case letters are used: aa, ab, and so on. Hence, for example,SN 2003C designates the third supernova reported in the year 2003. The last supernova of 2005 was SN 2005nc, indicating that it was the 367th[nb 1] supernova found in 2005. Since the year 2000, professional and amateur astronomers find several hundreds of supernovae each year (572 in 2007, 261 in 2008, 390 in 2009).
Historical supernovae are known simply by the year they occurred: SN 185, SN 1006, SN 1054, SN 1572 (called Tycho's Nova) and SN 1604 (Kepler's Star). Since 1885 the additional letter notation has been used, even if there was only one supernova discovered that year (e.g. SN 1885A, SN 1907A, etc.) — this last happened with SN 1947A. SN, for SuperNova, is a standard prefix. Until 1987, two-letter designations were rarely needed; since 1988, however, they have been needed every year.
As part of the attempt to understand supernovae, astronomers have classified them according to the absorption lines of different chemical elements that appear in their spectra. The first element for a division is the presence or absence of a line caused by hydrogen. If a supernova's spectrum contains a line of hydrogen (known as the Balmer series in the visual portion of the spectrum) it is classified Type II; otherwise it is Type I. Among those types, there are subdivisions according to the presence of lines from other elements and the shape of the light curve (a graph of the supernova's apparent magnitude as a function of time).
Supernova taxonomy Type Characteristics Type I Type Ia Lacks hydrogen and presents a singly ionized silicon (Si II) line at 615.0 nm (nanometers), near peak light. Type Ib Non-ionized helium (He I) line at 587.6 nm and no strong silicon absorption feature near 615 nm. Type Ic Weak or no helium lines and no strong silicon absorption feature near 615 nm. Type II Type IIP Reaches a "plateau" in its light curve Type IIL Displays a "linear" decrease in its light curve (linear in magnitude versus time).
The supernovae of Type II can also be sub-divided based on their spectra. While most Type II supernova show very broad emission lines which indicate expansion velocities of many thousands of kilometres per second, some have relatively narrow features. These are called Type IIn, where the 'n' stands for 'narrow'. Supernovae that do not fit into the normal classifications are designated peculiar, or 'pec'.
A few supernovae, such as SN 1987K and SN 1993J, appear to change types: they show lines of hydrogen at early times, but, over a period of weeks to months, become dominated by lines of helium. The term "Type IIb" is used to describe the combination of features normally associated with Types II and Ib.
The type codes described above that astronomers give to supernovas are taxonomic in nature: the type number describes the light observed from the supernova, not necessarily its cause. The following summarize what astronomers currently believe are the most plausible explanations for supernovas.
There are several means by which a supernova of this type can form, but they share a common underlying mechanism. If a carbon-oxygen[nb 2] white dwarf accreted enough matter to reach the Chandrasekhar limit of about 1.38 solar masses (for a non-rotating star), it would no longer be able to support the bulk of its plasma through electron degeneracy pressure and would begin to collapse. However, the current view is that this limit is not normally attained; increasing temperature and density inside the core ignite carbon fusion as the star approaches the limit (to within about 1%), before collapse is initiated. Within a few seconds, a substantial fraction of the matter in the white dwarf undergoes nuclear fusion, releasing enough energy (1–2 × 1044 joules) to unbind the star in a supernova explosion. An outwardly expanding shock wave is generated, with matter reaching velocities on the order of 5,000–20,000 km/s, or roughly 3% of the speed of light. There is also a significant increase in luminosity, reaching an absolute magnitude of −19.3 (or 5 billion times brighter than the Sun), with little variation.
One model for the formation of this category of supernova is a close binary star system. The larger of the two stars is the first to evolve off the main sequence, and it expands to form a red giant. The two stars now share a common envelope, causing their mutual orbit to shrink. The giant star then sheds most of its envelope, losing mass until it can no longer continue nuclear fusion. At this point it becomes a white dwarf star, composed primarily of carbon and oxygen. Eventually the secondary star also evolves off the main sequence to form a red giant. Matter from the giant is accreted by the white dwarf, causing the latter to increase in mass.
Another model for the formation of a Type Ia explosion involves the merger of two white dwarf stars, with the combined mass momentarily exceeding the Chandrasekhar limit. A white dwarf could also accrete matter from other types of companions, including a main sequence star (if the orbit is sufficiently close).
Type Ia supernovae follow a characteristic light curve—the graph of luminosity as a function of time—after the explosion. This luminosity is generated by the radioactive decay of nickel-56 through cobalt-56 to iron-56. The peak luminosity of the light curve was believed to be consistent across Type Ia supernovae (the vast majority of which are initiated with a uniform mass via the accretion mechanism), having a maximum absolute magnitude of about -19.3. This would allow them to be used as a secondary standard candle to measure the distance to their host galaxies. However, recent discoveries reveal that there is some evolution in the average lightcurve width, and thus in the intrinsic luminosity of supernovae, although significant evolution is found only over a large redshift baseline.
Type Ib and Ic
These events, like supernovae of Type II, are probably massive stars running out of fuel at their centers; however, the progenitors of Types Ib and Ic have lost most of their outer (hydrogen) envelopes due to strong stellar winds or else from interaction with a companion. Type Ib supernovae are thought to be the result of the collapse of a massive Wolf-Rayet star. There is some evidence that a few percent of the Type Ic supernovae may be the progenitors of gamma ray bursts (GRB), though it is also believed that any hydrogen-stripped, Type Ib or Ic supernova could be a GRB, dependent upon the geometry of the explosion.
Stars with at least nine solar masses of material evolve in a complex fashion. In the core of the star, hydrogen is fused into helium and the thermal energy released creates an outward pressure, which maintains the core in hydrostatic equilibrium and prevents collapse.
When the core's supply of hydrogen is exhausted, this outward pressure is no longer created. The core begins to collapse, causing a rise in temperature and pressure which becomes great enough to ignite the helium and start a helium-to-carbon fusion cycle, creating sufficient outward pressure to halt the collapse. The core expands and cools slightly, with a hydrogen-fusion outer layer, and a hotter, higher pressure, helium-fusion center. (Other elements such as magnesium, sulfur and calcium are also created and in some cases burned in these further reactions.)
This process repeats several times; each time the core collapses, and the collapse is halted by the ignition of a further process involving more massive nuclei and higher temperatures and pressures. Each layer is prevented from collapse by the heat and outward pressure of the fusion process in the next layer inward; each layer also burns hotter and quicker than the previous one—the final burn of silicon to iron consumes its fuel in just a few days at most. The star becomes layered like an onion, with the burning of more easily fused elements occurring in larger shells.
In the later stages increasingly heavier elements with higher binding energy undergo nuclear fusion. Fusion produces progressively less energy, and also at higher core energies photodisintegration and electron capture occur which cause further energy loss in the core, requiring a general acceleration of the fusion processes to maintain hydrostatic equilibrium. This escalation culminates with the production of nickel-56, which is unable to produce energy through fusion (but does produce iron-56 through radioactive decay). As a result, a nickel-iron core builds up that cannot produce further outward pressure on the scale needed to support the rest of the structure. It can only support the overlaying mass of the star through the degeneracy pressure of electrons in the core. If the star is sufficiently large, then the iron-nickel core will eventually exceed the Chandrasekhar limit (1.38 solar masses), at which point this mechanism catastrophically fails. The forces holding atomic nuclei apart in the innermost layer of the core suddenly give way, the core implodes due to its own mass, and no further fusion process is available to ignite and prevent collapse this time.
The core collapses in on itself with velocities reaching 70,000 km/s (0.23c), resulting in a rapid increase in temperature and density. The energy loss processes operating in the core cease to be in equilibrium. Through photodisintegration, gamma rays decompose iron into helium nuclei and free neutrons, absorbing energy, while electrons and protons merge via electron capture, producing neutrons and electron neutrinos, which escape.
In a typical Type II supernova the newly formed neutron core has an initial temperature of about 100 billion kelvin (100 GK), 6000 times the temperature of the sun's core. A further release of neutrinos carries away much of the thermal energy, allowing a stable neutron star to form (the neutrons would "boil away" if this cooling did not occur). These 'thermal' neutrinos form as neutrino-antineutrino pairs of all flavors, and total several times the number of electron-capture neutrinos. About 1046 joules of gravitational energy—approximately 10% of the star's rest mass—is converted into a ten-second burst of neutrinos, which is the main output of the event. These carry away energy from the core and accelerate the collapse, while some neutrinos are absorbed by the star's outer layers and provide energy to the supernova explosion.
The inner core eventually reaches typically 30 km diameter, and a density comparable to that of an atomic nucleus, and further collapse is abruptly stopped by strong force interactions and by degeneracy pressure of neutrons. The infalling matter, suddenly halted, rebounds, producing a shock wave that propagates outward. Computer simulations indicate that this expanding shock does not directly cause the supernova explosion; rather, it stalls within milliseconds in the outer core as energy is lost through the dissociation of heavy elements, and a process that is not clearly understood[update] is necessary to allow the outer layers of the core to reabsorb around 1044 joules[nb 3] (1 foe) of energy, producing the visible explosion. Current[update] research focuses upon a combination of neutrino reheating, rotational and magnetic effects as the basis for this process.
When the progenitor star is below about 20 solar masses (depending on the strength of the explosion and the amount of material that falls back), the degenerate remnant of a core collapse is a neutron star. Above this mass the remnant collapses to form a black hole. (This type of collapse is one of many candidate explanations for gamma ray bursts, possibly producing a large burst of gamma rays through a hypernova explosion.) The theoretical limiting mass for this type of core collapse scenario was estimated around 40–50 solar masses.
Above 50 solar masses stars were believed to collapse directly into a black hole without forming a supernova explosion, although uncertainties in models of supernova collapse make accurate calculation of these limits difficult. Above about 140 solar masses stars may become pair-instability supernovae that do not leave behind a black hole remnant.
Light curves and unusual spectra
The light curves for Type II supernovae are distinguished by the presence of hydrogen Balmer absorption lines in the spectra. These light curves have an average decay rate of 0.008 magnitudes per day, much lower than the decay rate for Type I supernovae. Type II are sub-divided into two classes, depending on whether there is a plateau in their light curve (Type II-P) or a linear decay rate (Type II-L). The net decay rate is higher at 0.012 magnitudes per day for Type II-L compared to 0.0075 magnitudes per day for Type II-P. The difference in the shape of the Type II-L supernovae light curve is believed to be caused by the expulsion of most of the hydrogen envelope of the progenitor star.
The plateau phase in Type II-P supernovae is due to a change in the opacity of the exterior layer. The shock wave ionizes the hydrogen in the outer envelope, which greatly increases the opacity. This prevents photons from the inner parts of the explosion from escaping. Once the hydrogen cools sufficiently to recombine, the outer layer becomes transparent.
Of the Type II supernovae with unusual features in their spectra, Type IIn supernovae may be produced by the interaction of the ejecta with circumstellar material. Type IIb supernovae are likely massive stars which have lost most, but not all, of their hydrogen envelopes through tidal stripping by a companion star. As the ejecta of a Type IIb expands, the hydrogen layer quickly becomes optically thin and reveals the deeper layers.
The peak absolute magnitude of Type II supernovae varies from one to another, but they are dimmer than Type Ia. For instance, the low-luminosity SN 1987A had a peak visual absolute magnitude of -15.5 (apparent magnitude +3 for a distance of 51 kpc), as compared to the standard -19.3 for Type Ia.
The core temperature of a star of over about 140 solar masses can become so high that photons convert spontaneously to electron-positron pairs, reducing the photon pressure supporting the star's outer layers and triggering a collapse that leads to a supernova explosion. This pair-instability supernova creates a larger quantity of elements heavier than helium ("metals") than other types of supernova and leaves no black hole as a remnant. Stars of this size can only form from interstellar gas with very low metal content, which is characteristic of the early universe before the first supernovae produced metals from the primordial hydrogen and helium. It is believed that supernova SN 2007bi was of this type; it was distinguished from other supernovae by very long duration—77 days to peak brightness, bright enough to observe for 555 days—and production of much more radioactive nickel. The pair-instability supernova was predicted by Gary S. Fraley in 1968.
A long-standing puzzle surrounding Type II supernovae is why the compact object remaining after the explosion is given a large velocity away from the core. (Neutron stars are observed, as pulsars, to have high velocities; black holes presumably do as well, but are far harder to observe in isolation.) The initial impetus can be substantial, propelling an object of more than a solar mass at a velocity of 500 km/s or greater. This displacement indicates an asymmetry in the explosion, but the mechanism by which this momentum is transferred to the compact object remains[update] a puzzle. Proposed explanations for this kick include convection in the collapsing star and jet production during neutron star formation.
One possible explanation for the asymmetry in the explosion is large-scale convection above the core. The convection can create variations in the local abundances of elements, resulting in uneven nuclear burning during the collapse, bounce and resulting explosion.
Another possible explanation is that accretion of gas onto the central neutron star can create a disk that drives highly directional jets, propelling matter at a high velocity out of the star, and driving transverse shocks that completely disrupt the star. These jets might play a crucial role in the resulting supernova explosion. (A similar model is now favored for explaining long gamma ray bursts.)
Initial asymmetries have also been confirmed in Type Ia supernova explosions through observation. This result may mean that the initial luminosity of this type of supernova depends on the viewing angle. However, the explosion becomes more symmetrical with the passage of time. Early asymmetries are detectable by measuring the polarization of the emitted light.
Because they have a similar functional model, Types Ib, Ic and various Types II supernovae are collectively called Core Collapse supernovae. A fundamental difference between Type Ia and Core Collapse supernovae is the source of energy for the radiation emitted near the peak of the light curve. The progenitors of Core Collapse supernovae are stars with extended envelopes that can attain a degree of transparency with relatively little expansion. Most of the energy powering the emission at peak light is derived from the shock wave that heats and ejects the envelope.
The progenitors of Type Ia supernovae, on the other hand, are compact objects, much smaller (but more massive) than the Sun, that must expand (and therefore cool) enormously before becoming transparent. Heat from the explosion is dissipated in the expansion and is not available for light production. The radiation emitted by Type Ia supernovae is thus entirely attributable to the decay of radionuclides produced in the explosion; principally nickel-56 (with a half-life of 6.1 days) and its daughter cobalt-56 (with a half-life of 77 days). Gamma rays emitted during this nuclear decay are absorbed by the ejected material, heating it to incandescence.
As the material ejected by a Core Collapse supernova expands and cools, radioactive decay eventually takes over as the main energy source for light emission in this case also. A bright Type Ia supernova may expel 0.5–1.0 solar masses of nickel-56, while a Core Collapse supernova probably ejects closer to 0.1 solar mass of nickel-56.
Source of heavy elements
Supernovae are a key source of elements heavier than oxygen. These elements are produced by nuclear fusion (for iron-56 and lighter elements), and by nucleosynthesis during the supernova explosion for elements heavier than iron. Supernovae are the most likely, although not undisputed, candidate sites for the r-process, which is a rapid form of nucleosynthesis that occurs under conditions of high temperature and high density of neutrons. The reactions produce highly unstable nuclei that are rich in neutrons. These forms are unstable and rapidly beta decay into more stable forms.
The r-process reaction, which is likely to occur in type II supernovae, produces about half of all the element abundance beyond iron, including plutonium and uranium. The only other major competing process for producing elements heavier than iron is the s-process in large, old red giant stars, which produces these elements much more slowly, and which cannot produce elements heavier than lead.
Role in stellar evolution
The remnant of a supernova explosion consists of a compact object and a rapidly expanding shock wave of material. This cloud of material sweeps up the surrounding interstellar medium during a free expansion phase, which can last for up to two centuries. The wave then gradually undergoes a period of adiabatic expansion, and will slowly cool and mix with the surrounding interstellar medium over a period of about 10,000 years.
The Big Bang produced hydrogen, helium, and traces of lithium, while all heavier elements are synthesized in stars and supernovae. Supernovae tend to enrich the surrounding interstellar medium with metals—elements other than hydrogen and helium.
These injected elements ultimately enrich the molecular clouds that are the sites of star formation. Thus, each stellar generation has a slightly different composition, going from an almost pure mixture of hydrogen and helium to a more metal-rich composition. Supernovae are the dominant mechanism for distributing these heavier elements, which are formed in a star during its period of nuclear fusion, throughout space. The different abundances of elements in the material that forms a star have important influences on the star's life, and may decisively influence the possibility of having planets orbiting it.
The kinetic energy of an expanding supernova remnant can trigger star formation due to compression of nearby, dense molecular clouds in space. The increase in turbulent pressure can also prevent star formation if the cloud is unable to lose the excess energy.
Evidence from daughter products of short-lived radioactive isotopes shows that a nearby supernova helped determine the composition of the Solar System 4.5 billion years ago, and may even have triggered the formation of this system. Supernova production of heavy elements over astronomic periods of time ultimately made the chemistry of life on Earth possible.
Effect on Earth
A near-Earth supernova is a supernova close enough to the Earth to have noticeable effects on its biosphere. This would need to be nearer than about 100 to 3000 light-years away, depending upon type and energy—different figures have been suggested. Gamma rays from a supernova would induce a chemical reaction in the upper atmosphere converting molecular nitrogen into nitrogen oxides, depleting the ozone layer enough to expose the surface to harmful solar and cosmic radiation. This has been proposed as the cause of the Ordovician–Silurian extinction, which resulted in the death of nearly 60% of the oceanic life on Earth. In 1996 it was theorized that traces of past supernovae might be detectable on Earth in the form of metal isotope signatures in rock strata. Iron-60 enrichment was later reported in deep-sea rock of the Pacific Ocean. In 2009, elevated levels of nitrate ions were found in Antarctic ice, which coincided with the 1006 and 1054 supernovae. Gamma rays from these supernovae could have boosted levels of nitrogen oxides, which became trapped in the ice.
Type Ia supernovae are thought to be potentially the most dangerous if they occur close enough to the Earth. Because these supernovae arise from dim, common white dwarf stars, it is likely that a supernova that can affect the Earth will occur unpredictably and in a star system that is not well studied. One theory suggests that a Type Ia supernova would have to be closer than a thousand parsecs (3300 light-years) to affect the Earth. The closest known candidate is IK Pegasi (see below). Recent estimates predict that a Type II supernova would have to be closer than eight parsecs (26 light-years) to destroy half of the Earth's ozone layer.
Milky Way candidates
Several large stars within the Milky Way have been suggested as possible supernovae within the next million years. These include Rho Cassiopeiae, Eta Carinae, RS Ophiuchi, U Scorpii, VY Canis Majoris, Betelgeuse, Antares, and Spica. Many Wolf–Rayet stars, such as Gamma Velorum, WR 104, and those in the Quintuplet Cluster, are also considered possible precursor stars to a supernova explosion in the 'near' future.
The nearest supernova candidate is IK Pegasi (HR 8210), located at a distance of 150 light-years. This closely orbiting binary star system consists of a main sequence star and a white dwarf 31 million kilometres apart. The dwarf has an estimated mass 1.15 times that of the Sun. It is thought that several million years will pass before the white dwarf can accrete the critical mass required to become a Type Ia supernova.
- Champagne Supernova
- Dwarf nova
- Guest star (astronomy)
- List of supernovae
- List of supernova remnants
- Neutron star
- Quark nova
- Supernovae in fiction
- Timeline of white dwarfs, neutron stars, and supernovae
- Supernova impostor
- ^ The value is obtained by converting the suffix "nc" from base 26, with a = 1, b = 2, c =3, ... z = 26. Thus nc = n × 26 + c = 14 × 26 + 3 = 367.
- ^ For a core primarily composed of oxygen, neon and magnesium, the collapsing white dwarf will typically form a neutron star. In this case, only a fraction of the star's mass will be ejected during the collapse.
See: Fryer, C. L.; New, K. C. B. (2006-01-24). 2.1 Collapse scenario. "Gravitational Waves from Gravitational Collapse". Living Reviews in Relativity 6 (2). http://relativity.livingreviews.org/open?pubNo=lrr-2003-2&page=articlesu1.html. Retrieved 2007-06-07.
- ^ Per the American Physical Society Neutrino Study reference, Barwick, Beacom et al. (2004), roughly 99% of the gravitational potential energy is released as neutrinos of all flavors. The remaining 1% is equal to 1044 J
- ^ Giacobbe, F. W. (2005). "How a Type II Supernova Explodes". Electronic Journal of Theoretical Physics 2 (6): 30–38. Bibcode 2005EJTP....2f..30G.
- ^ "Introduction to Supernova Remnants". NASA/GSFC. 2007-10-04. http://heasarc.gsfc.nasa.gov/docs/objects/snrs/snrstext.html. Retrieved 2011-03-15.
- ^ Schawinski, K.; et al. (2008). "Supernova Shock Breakout from a Red Supergiant". Science 321 (5886): 223–226. Bibcode 2008Sci...321..223S. doi:10.1126/science.1160456. PMID 18556514.
- ^ Zwicky, F.. "Name NASA's Next Great Observatory". NASA. http://chandra.harvard.edu/contest/zwicess.html. Retrieved 2010-02-20.
- ^ a b Baade, W.; Zwicky, F. (1934). "On Super-novae". Proceedings of the National Academy of Sciences 20 (5): 254–259. Bibcode 1934PNAS...20..254B. doi:10.1073/pnas.20.5.254. PMC 1076395. PMID 16587881. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=1076395.
- ^ "Supernova". Merriam-Webster's Online Collegiate Dictionary. http://www.merriam-webster.com/dictionary/supernova. Retrieved 2009-06-10.
- ^ a b c Mazzali, P. A.; Röpke, F. K.; Benetti, S.; Hillebrandt, W. (2007). "A Common Explosion Mechanism for Type Ia Supernovae". Science 315 (5813): 825–828. arXiv:astro-ph/0702351. Bibcode 2007Sci...315..825M. doi:10.1126/science.1136259. PMID 17289993.
- ^ a b "Integral identifies supernova rate for Milky Way". European Space Agency. 2006-01-04. http://www.esa.int/SPECIALS/Integral/SEMACK0VRHE_0.html. Retrieved 2007-02-02.
- ^ Whittet, D. C. B. (2003). Dust in the Galactic Environment. CRC Press. pp. 45–46. ISBN 0750306246.
- ^ a b Krebs, J.; Hillebrandt, W. (1983). "The interaction of supernova shockfronts and nearby interstellar clouds". Astronomy and Astrophysics 128 (2): 411–419. Bibcode 1983A&A...128..411K.
- ^ Allen, J. (1998-02-02). "Supernova Effects". NASA/GSFC. http://imagine.gsfc.nasa.gov/docs/ask_astro/answers/980202b.html. Retrieved 2007-02-02.
- ^ Boss, A. P.; et al. (2008). "Simultaneous Triggered Collapse of the Presolar Dense Cloud Core and Injection of Short-Lived Radioisotopes by a Supernova Shock Wave". Astrophysical Journal Letters 686 (2): L119–122. Bibcode 2008ApJ...686L.119B. doi:10.1086/593057.
- ^ a b Motz, L.; Weaver, J. H. (2001). The Story of Astronomy. Basic Books. pp. 76. ISBN 0738205869. http://books.google.com/?id=HRcddzNMlzkC&pg=PA76&dq#v=onepage&q=&f=false.
- ^ "Astronomers Peg Brightness of History’s Brightest Star" (Press release). National Optical Astronomy Observatory. 2003-03-05. http://www.noao.edu/outreach/press/pr03/pr0304.html. [dead link]
- ^ Clark, D. H.; Stephenson, F. R. (1981-06-29). "The Historical Supernovae". Supernovae: A survey of current research; Proceedings of the Advanced Study Institute. Cambridge, England: Dordrecht, D. Reidel. pp. 355–370. Bibcode 1982sscr.conf..355C.
- ^ "Bill Blair's Kepler's Supernova Remnant Page". http://fuse.pha.jhu.edu/~wpb/Kepler/kepler.html. Retrieved 2009-10-07.
- ^ van Zyl, J. E. (2003). "Variable Stars VI". Astronomical Society of Southern Africa. Archived from the original on 2006-09-23. http://web.archive.org/web/20060923095244/http://www.aqua.co.za/assa_jhb/new/canopus/can2003/c039litu.htm. Retrieved 2006-09-27.
- ^ da Silva, L. A. L. (1993). "The Classification of Supernovae". Astrophysics and Space Science 202 (2): 215–236. Bibcode 1993Ap&SS.202..215D. doi:10.1007/BF00626878.
- ^ Kowal, C. T. (1968). "Absolute magnitudes of supernovae". Astronomical Journal 73: 1021–1024. Bibcode 1968AJ.....73.1021K. doi:10.1086/110763.
- ^ Leibundgut, B.; Sollerman, J. (2001). "A cosmological surprise: the universe accelerates". Europhysics News 32 (4): 121. Bibcode 2001ENews..32..121L. doi:10.1051/epn:2001401. http://www.eso.org/~bleibund/papers/EPN/epn.html.
- ^ "Confirmation of the accelerated expansion of the Universe". Centre National de la Recherche Scientifique. 2003-08-19. http://www2.cnrs.fr/en/45.htm?&debut=160xt/. Retrieved 2006-11-03.
- ^ Fabian, A. C. (2008). "A Blast from the Past". Science 320 (5880): 1167–1168. doi:10.1126/science.1158538. PMID 18511676.
- ^ Aschenbach, B. (1998). "Discovery of a young nearby supernova remnant". Nature 396 (6707): 141–142. Bibcode 1998Natur.396..141A. doi:10.1038/24103.
- ^ Iyudin, A. F.; et al. (1998). "Emission from 44Ti associated with a previously unknown Galactic supernova". Nature 396 (6707): 142–144. Bibcode 1998Natur.396..142I. doi:10.1038/24106.
- ^ "Ancient supernovae found written into the Antarctic ice". New Scientist (2698). 2009-03-04. http://www.newscientist.com/article/mg20126984.800-ancient-supernovae-found-written-into-the-antarctic-ice.html.
- ^ Motizuki, Y.; et al. (2009). "An Antarctic ice core recording both supernovae and solar cycles". arXiv:0902.3446 [astro-ph.HE].
- ^ Murdin, Paul; Murdin, Lesley (1985). Supernovae (2nd ed.). Cambridge University Press. p. 42. ISBN 052130038X.
- ^ Bishop, D. (2011-03-14). "Bright Supernovae". Rochester's Astronomy Club. http://www.rochesterastronomy.org/snimages/. Retrieved 2011-03-15.
- ^ Zuckerman, B.; Malkan, M. A. (1996). The Origin and Evolution of the Universe. Jones & Bartlett Learning. p. 68. ISBN 0-763-70030-4. http://books.google.com/books?id=G0iR4jpWKN4C&pg=PA68.
- ^ Evans, R. O. (1993). "Supernova Search Manual, 1993". American Association of Variable Star Observers. Archived from the original on 2006-09-24. http://web.archive.org/web/20060924083150/http://www.aavso.org/observing/programs/sn/. Retrieved 2006-10-05.
- ^ Antonioli, P.; et al. (2004). "SNEWS: the SuperNova Early Warning System". New Journal of Physics 6: 114. arXiv:astro-ph/0406214. Bibcode 2004NJPh....6..114A. doi:10.1088/1367-2630/6/1/114.
- ^ "SNEWS: Supernova Early Warning System". National Science Foundation. http://snews.bnl.gov/. Retrieved 2006-11-28.
- ^ Beacom, J. F. (1999). "Supernova Neutrinos and the Neutrino Masses". arXiv:hep-ph/9901300 [hep-ph].
- ^ Frieman, J. (2006). "SDSS Supernova Survey". SDSS. http://sdssdp47.fnal.gov/sdsssn/sdsssn.html. Retrieved 2006-08-10. [dead link]
- ^ Perlmutter, S. (2000-09-25). "High Redshift Supernova Search". Lawrence Berkeley National Laboratory. http://www-supernova.lbl.gov/public/. Retrieved 2006-10-09.
- ^ Linder, E. V.; Huterer, D. (2003). "Importance of supernovae at z>1.5 to probe dark energy". Physical Review D 67 (8): 081303. arXiv:astro-ph/0208138. Bibcode 2002astro.ph..8138L. doi:10.1103/PhysRevD.67.081303.
- ^ Perlmutter, S.; et al. (1997). "Measurements of the Cosmological Parameters Ω and Λ from the First Seven Supernovae at z ≥ 0.35". Astrophysical Journal 483 (2): 565. arXiv:astro-ph/9608192. Bibcode 1997ApJ...483..565P. doi:10.1086/304265.
- ^ Aldering, G. (2009-05-27). "The Nearby Supernova Factory". Lawrence Berkeley National Laboratory. http://snfactory.lbl.gov/. Retrieved 2006-12-01.
- ^ "List of Supernovae". Harvard-Smithsonian Center for Astrophysics. http://www.cbat.eps.harvard.edu/lists/Supernovae.html. Retrieved 2011-09-21.
- ^ "List of Supernovae". IAU Central Bureau for Astronomical Telegrams. http://cbat.eps.harvard.edu/lists/Supernovae.html. Retrieved 2010-10-25.
- ^ "The Padova-Asiago supernova catalogue". Osservatorio Astronomico di Padova. http://web.oapd.inaf.it/supern/snean.txt. Retrieved 2006-11-28.
- ^ Cappellaro, E.; Turatto, M. (2000-08-08). "Supernova Types and Rates". Influence of Binaries on Stellar Population Studies. Brussels, Belgium: Dordrecht: Kluwer Academic Publishers. Bibcode 2000astro.ph.12455C.
- ^ a b c Montes, M. (2002-02-12). "Supernova Taxonomy". US Naval Research Laboratory. http://rsd-www.nrl.navy.mil/7212/montes/snetax.html. Retrieved 2006-11-09.
- ^ a b Doggett, J. B.; Branch, D. (1985). "A Comparative Study of Supernova Light Curves". Astronomical Journal 90: 2303–2311. Bibcode 1985AJ.....90.2303D. doi:10.1086/113934.
- ^ a b Lieb, E. H.; Yau, H.-T. (1987). "A rigorous examination of the Chandrasekhar theory of stellar collapse". Astrophysical Journal 323 (1): 140–144. Bibcode 1987ApJ...323..140L. doi:10.1086/165813.
- ^ Canal, R.; Gutiérrez, J. L. (1997). "The possible white dwarf-neutron star connection". In Isern, J.; Hernanz, M.; Gracia-Berro, E.. Proceedings of the 10th European Workshop on White Dwarfs. 214. Dordrecht: Kluwer Academic Publishers. pp. 49. Bibcode 1997astro.ph..1225C. ISBN 0792345851.
- ^ Wheeler, J. C. (2000). Cosmic Catastrophes: Supernovae, Gamma-Ray Bursts, and Adventures in Hyperspace. Cambridge University Press. pp. 96. ISBN 0521651956.
- ^ Khokhlov, A.; Müller, E.; Hoeflich, P. (1993). "Light curves of Type IA supernova models with different explosion mechanisms". Astronomy and Astrophysics 270 (1–2): 223–248. Bibcode 1993A&A...270..223K.
- ^ Röpke, F. K.; Hillebrandt, W. (2004). "The case against the progenitor's carbon-to-oxygen ratio as a source of peak luminosity variations in Type Ia supernovae". Astronomy and Astrophysics Letters 420 (1): L1–L4. arXiv:astro-ph/0403509. Bibcode 2004A&A...420L...1R. doi:10.1051/0004-6361:20040135.
- ^ a b Hillebrandt, W.; Niemeyer, J. C. (2000). "Type IA Supernova Explosion Models". Annual Review of Astronomy and Astrophysics 38 (1): 191–230. arXiv:astro-ph/0006305. Bibcode 2000ARA&A..38..191H. doi:10.1146/annurev.astro.38.1.191.
- ^ Richmond, M.. "Late stages of evolution for low-mass stars". Rochester Institute of Technology. http://spiff.rit.edu/classes/phys230/lectures/planneb/planneb.html. Retrieved 2011-03-15.
- ^ Paczynski, B. (July 28 – August 1, 1975). "Common Envelope Binaries". Structure and Evolution of Close Binary Systems. Cambridge, England: Dordrecht, D. Reidel. pp. 75–80. Bibcode 1976IAUS...73...75P.
- ^ Postnov, K. A.; Yungelson, L. R. (2006). 3.5 Common envelope stage. "The Evolution of Compact Binary Star Systems". Living Reviews in Relativity 9 (6). http://relativity.livingreviews.org/open?pubNo=lrr-2006-6&page=articlesu8.html.
- ^ "Type Ia Supernova Progenitors". Swinburne University. http://cosmos.swin.edu.au/entries/typeiasupernovaprogenitors/typeiasupernovaprogenitors.html?e=1. Retrieved 2007-05-20.
- ^ Macri, L. M.; et al. (2006). "A New Cepheid Distance to the Maser-Host Galaxy NGC 4258 and Its Implications for the Hubble Constant". Astrophysical Journal 652 (2): 1133–1149. arXiv:astro-ph/0608211. Bibcode 2006ApJ...652.1133M. doi:10.1086/508530.
- ^ Colgate, S. A. (1979). "Supernovae as a standard candle for cosmology". Astrophysical Journal 232 (1): 404–408. Bibcode 1979ApJ...232..404C. doi:10.1086/157300.
- ^ Howell, D. A.; Sullivan, M.; Conley, A.; Carlberg, R. (2007). "Predicted and Observed Evolution in the Mean Properties of Type Ia Supernovae with Redshift". Astrophysical Journal Letters 667 (1): L37–L40. arXiv:astro-ph/0701912. Bibcode 2007ApJ...667L..37H. doi:10.1086/522030.
- ^ Malesani, D.; et al. (2008). "Early spectroscopic identification of SN 2008D". arXiv:0805.1188M.
- ^ Naeye, R.; Gutro, R. (2008-05-21). "NASA's Swift Satellite Catches First Supernova in the Act of Exploding". NASA/GSFC. http://www.nasa.gov/centers/goddard/news/topstory/2008/swift_supernova.html. Retrieved 2008-05-22.
- ^ Pols, O. (1997). "Close Binary Progenitors of Type Ib/Ic and IIb/II-L Supernovae". In Leung, K.-C. Proceedings of The Third Pacific Rim Conference on Recent Development on Binary Star Research. ASP Conference Series. 130. pp. 153–158. Bibcode 1997rdbs.conf..153P.
- ^ Ryder, S. D.; et al. (2004). "Modulations in the radio light curve of the Type IIb supernova 2001ig: evidence for a Wolf-Rayet binary progenitor?". Monthly Notices of the Royal Astronomical Society 349 (3): 1093–1100. arXiv:astro-ph/0401135. Bibcode 2004MNRAS.349.1093R. doi:10.1111/j.1365-2966.2004.07589.x.
- ^ Gilmore, G. (2004). "The Short Spectacular Life of a Superstar". Science 304 (5697): 1915–1916. doi:10.1126/science.1100370. PMID 15218132.
- ^ a b c d e f Woosley, S.; Janka, H.-T. (2005). "The Physics of Core-Collapse Supernovae". Nature Physics 1 (3): 147–154. arXiv:astro-ph/0601261. Bibcode 2005NatPh...1..147W. doi:10.1038/nphys172.
- ^ Richmond, M. "Late stages of evolution for low-mass stars". Rochester Institute of Technology. http://spiff.rit.edu/classes/phys230/lectures/planneb/planneb.html. Retrieved 2006-08-04.
- ^ a b Hinshaw, G. (2006-08-23). "The Life and Death of Stars". NASA/WMAP. http://map.gsfc.nasa.gov/m_uni/uni_101stars.html. Retrieved 2006-09-01.
- ^ Fewell, M. P. (1995). "The atomic nuclide with the highest mean binding energy". American Journal of Physics 63 (7): 653–658. Bibcode 1995AmJPh..63..653F. doi:10.1119/1.17828.
- ^ Fleurot, F. "Evolution of Massive Stars". Laurentian University. http://nu.phys.laurentian.ca/~fleurot/evolution/. Retrieved 2007-08-13.
- ^ a b Fryer, C. L.; New, K. C. B. (2006-01-24). "Gravitational Waves from Gravitational Collapse". Living Reviews in Relativity 6 (2). http://relativity.livingreviews.org/Articles/lrr-2003-2/. Retrieved 2006-12-14.
- ^ Mann, A. K. (1997). Shadow of a star: The neutrino story of Supernova 1987A. W. H. Freeman. pp. 122. ISBN 0716730979.
- ^ Gribbin, J. R.; Gribbin, M. (2000). Stardust: Supernovae and Life - The Cosmic Connection. Yale University Press. pp. 173. ISBN 9780300090970.
- ^ Barwick, S.; et al. (2004-10-29). "APS Neutrino Study: Report of the Neutrino Astrophysics and Cosmology Working Group". American Physical Society. http://www.aps.org/policy/reports/multidivisional/neutrino/upload/Neutrino_Astrophysics_and_Cosmology_Working_Group.pdf. Retrieved 2006-12-12.
- ^ Hayakawa, T.; et al. (2006). "Principle of Universality of Gamma-Process Nucleosynthesis in Core-Collapse Supernova Explosions". Astrophysical Journal Letters 648 (1): L47–L50. Bibcode 2006ApJ...648L..47H. doi:10.1086/507703.
- ^ S. Myra, E.; Burrows, A. (1990). "Neutrinos from type II supernovae- The first 100 milliseconds". Astrophysical Journal 364: 222–231. Bibcode 1990ApJ...364..222M. doi:10.1086/169405.
- ^ Fryer, C. L.; New, K. C. B. (2006-01-24). 3.1 Collapse scenario. "Gravitational Waves from Gravitational Collapse". Living Reviews in Relativity 6 (2). http://relativity.livingreviews.org/open?pubNo=lrr-2003-2&page=articlesu1.html. Retrieved 2006-12-14.
- ^ Chris L., M. (2003). "Black Hole Formation from Stellar Collapse". Classical and Quantum Gravity 20 (10): S73–S80. Bibcode 2003CQGra..20S..73F. doi:10.1088/0264-9381/20/10/309.
- ^ "Cosmological Gamma-Ray Bursts and Hypernovae Conclusively Linked". European Southern Observatory. 2003-06-18. http://www.eso.org/outreach/press-rel/pr-2003/pr-16-03.html. Retrieved 2006-10-30.
- ^ Fryer, C. L. (1999). "Mass Limits For Black Hole Formation". Astrophysical Journal 522 (1): 413–418. arXiv:astro-ph/9902315. Bibcode 1999ApJ...522..413F. doi:10.1086/307647.
- ^ Boen, B. (2007-05-05). "NASA's Chandra Sees Brightest Supernova Ever". NASA. http://www.nasa.gov/mission_pages/chandra/news/chandra_bright_supernova.html. Retrieved 2007-08-09.
- ^ Sanders, R. (2007-05-07). "Largest, brightest supernova ever seen may be long-sought pair-instability supernova". University of California, Berkeley. http://hubblesite.org/newscenter/newsdesk/archive/releases/1991/12/text/. Retrieved 2006-05-24.
- ^ "Type II Supernova Light Curves". Swinburne University of Technology. http://cosmos.swin.edu.au/lookup.html?e=typeiisupernovalightcurves. Retrieved 2007-03-17.
- ^ Pastorello, A.; et al. (2002). "The type IIn supernova 1995G: interaction with the circumstellar medium". Monthly Notices of the Royal Astronomical Society 333 (1): 27–38. arXiv:astro-ph/0201483. Bibcode 2002MNRAS.333...27P. doi:10.1046/j.1365-8711.2002.05366.x.
- ^ Utrobin, V. P. (1996). "Nonthermal ionization and excitation in Type IIb supernova 1993J". Astronomy and Astrophysics 306: 219–231. Bibcode 1996A&A...306..219U.
- ^ Richardson, D.; et al. (2002). "A Comparative Study of the Absolute Magnitude Distributions of Supernovae". Astronomical Journal 123 (2): 745–752. arXiv:astro-ph/0112051. Bibcode 2002AJ....123..745R. doi:10.1086/338318.
- ^ Fraley, G. S. (1968). "Supernovae Explosions Induced by Pair-Production Instability". Astrophysics and Space Science 2 (1): 96–114. Bibcode 1968Ap&SS...2...96F. doi:10.1007/BF00651498.
- ^ Hoflich, P.; Kumar, P.; Wheeler, J. C. (2004). "Neutron star kicks and supernova asymmetry". Cosmic explosions in three dimensions: Asymmetries in supernovae and gamma-ray bursts. Cambridge University Press. pp. 276. Bibcode 2004cetd.conf..276L.
- ^ Beasley, D.; Roy, S.; Watzke, M.; Villard, R. (2002-09-19). "Space Movie Reveals Shocking Secrets of the Crab Pulsar". NASA. http://hubblesite.org/newscenter/archive/releases/2002/24/text/. Retrieved 2006-08-10.
- ^ Frail, D. A.; Giacani, E. B.; Goss, W. M.; Dubner, G. (1996). "The Pulsar Wind Nebula Around PSR B1853+01 in the Supernova Remnant W44". Astrophysical Journal Letters 464 (2): L165–L168. arXiv:astro-ph/9604121. Bibcode 1996ApJ...464L.165F. doi:10.1086/310103.
- ^ Fryer, C. L. (2004). "Neutron Star Kicks from Asymmetric Collapse". Astrophysical Journal 601 (2): L175–L178. arXiv:astro-ph/0312265. Bibcode 2004ApJ...601L.175F. doi:10.1086/382044.
- ^ "Jets, Not Neutrinos, May Cause Supernova Explosions, Scientists Say". McDonald Observatory. 2002-03-02. http://mcdonaldobservatory.org/news/releases/2000/0302a.html. Retrieved 2006-12-11.
- ^ Foust, J. (2000-01-09). "Evidence presented for new supernova explosion model". Spaceflight Now. http://spaceflightnow.com/news/n0101/09supernova/. Retrieved 2006-12-13.
- ^ "The VLT Measures the Shape of a Type Ia Supernova". European Southern Observatory. 2003-08-06. http://www.eso.org/outreach/press-rel/pr-2003/pr-23-03.html. Retrieved 2006-12-11.
- ^ Leibundgut, B. (August 29 – September 12, 1993). "Observations of Supernovae". Proceedings of the NATO Advanced Study Institute on the Lives of the Neutron Stars. Kemer, Turkey: Dordrecht, Kluwer Academic Publishers. pp. 3. Bibcode 1995lns..conf....3L. ISBN 0-7923-324-6-6.
- ^ Matz, S. M.; Share, G. H. (1990). "A limit on the production of Ni-56 in a type I supernova". Astrophysical Journal 362: 235–24. Bibcode 1990ApJ...362..235M. doi:10.1086/169259.
- ^ Schlegel, E. M.; Kirshner, R. P. (1989). "The type Ib supernova 1984L in NGC 991". Astrophysical Journal 98: 577–589. Bibcode 1989AJ.....98..577S. doi:10.1086/115158.
- ^ François, P.; et al. (2004). "The evolution of the Milky Way from its earliest phases: Constraints on stellar nucleosynthesis". Astronomy and Astrophysics 421 (2): 613–621. arXiv:astro-ph/0401499. Bibcode 2004A&A...421..613F. doi:10.1051/0004-6361:20034140.
- ^ Woosley, S. E.; Arnett, W. D.; Clayton, D. D. (1973). "The Explosive Burning of Oxygen and Silicon". Astrophysical Journal Supplement 26: 231–312. Bibcode 1973ApJS...26..231W. doi:10.1086/190282.
- ^ Qian, Y.-Z.; Vogel, P.; Wasserburg, G. J. (1998). "Diverse Supernova Sources for the r-Process". Astrophysical Journal 494 (1): 285–296. arXiv:astro-ph/9706120. Bibcode 1998ApJ...494..285Q. doi:10.1086/305198.
- ^ Gonzalez, G.; Brownlee, D.; Ward, P. (2001). "The Galactic Habitable Zone: Galactic Chemical Evolution". Icarus 152 (1): 185–200. arXiv:astro-ph/0103165. Bibcode 2001Icar..152..185G. doi:10.1006/icar.2001.6617. Archived from the original on 2006-09-12. http://web.archive.org/web/20060912184254/http://isotope.colorado.edu/~astr5835/Gonzalez+et+al.+2001.pdf.
- ^ "Introduction to Supernova Remnants". High Energy Astrophysics Science Archive Research Center, NASA. 2006-09-07. http://heasarc.gsfc.nasa.gov/docs/objects/snrs/snrstext.html. Retrieved 2006-10-20.
- ^ Kulyk, C. L. (2006-06-19). "Explosive Debate: Supernova Dust Lost and Found". Space.com. http://www.space.com/scienceastronomy/060619_mystery_monday.html. Retrieved 2006-12-01.
- ^ Preibisch, T.; Zinnecker, H. (2001). "Triggered Star Formation in the Scorpius-Centaurus OB Association (Sco OB2)". ASP Conference Proceedings, From Darkness to Light: Origin and Evolution of Young Stellar Clusters. 243. San Francisco: Astronomical Society of the Pacific. p. 791. Bibcode 2001ASPC..243..791P.
- ^ Taylor, G. J. (2003-05-21). "Triggering the Formation of the Solar System". Planetary Science Research. http://www.psrd.hawaii.edu/May03/SolarSystemTrigger.html. Retrieved 2006-10-20.
- ^ Melott, A.; et al. (2004). "Did a gamma-ray burst initiate the late Ordovician mass extinction?". International Journal of Astrobiology 3 (2): 55–61. arXiv:astro-ph/0309415. Bibcode 2004IJAsB...3...55M. doi:10.1017/S1473550404001910.
- ^ "Researchers Detect 'Near Miss' Supernova Explosion". University of Illinois College of Liberal Arts and Sciences. Fall/Winter 2005–2006. pp. 17. Archived from the original on 2006-09-01. http://web.archive.org/web/20060901084028/http://www.las.uiuc.edu/alumni/news/fall2005/05fall_supernova.html. Retrieved 2007-02-01.
- ^ Knie, K.; et al. (2004). "60Fe Anomaly in a Deep-Sea Manganese Crust and Implications for a Nearby Supernova Source". Physical Review Letters 93 (17): 171103–171106. Bibcode 2004PhRvL..93q1103K. doi:10.1103/PhysRevLett.93.171103.
- ^ Fields, B. D.; Ellis, J. (1999). "On Deep-Ocean Fe-60 as a Fossil of a Near-Earth Supernova". New Astronomy 4 (6): 419–430. arXiv:astro-ph/9811457. Bibcode 1999NewA....4..419F. doi:10.1016/S1384-1076(99)00034-2.
- ^ Matson, J. (May 2009). "Supernovae in Ice". Scientific American: 28. http://net.planet.ee/raamat/ScientificAmerican2009/05_Scientific_American_-_May_2009.pdf.
- ^ See section 4 in Richmond, M. (2005-04-08). "Will a Nearby Supernova Endanger Life on Earth?". http://www.tass-survey.org/richmond/answers/snrisks.txt. Retrieved 2006-03-30.
- ^ Gorelick, M. (2007). "The Supernova Menace". Sky & Telescope.
- ^ Gehrels, N.; et al. (2003). "Ozone Depletion from Nearby Supernovae". Astrophysical Journal 585 (2): 1169–1176. arXiv:astro-ph/0211361. Bibcode 2003ApJ...585.1169G. doi:10.1086/346127.
- ^ van der Sluys, M,; Lamers, H. J. G. L. M. (2003). "The dynamics of the Wolf–Rayet ring nebula M1-67". Astronomical Institute of Utrecht. http://www.astro.uu.nl/~sluys/m1-67/. Retrieved 2007-06-07.
- ^ "The William Herschel telescope finds the best candidate for a supernova explosion". Particle Physics and Astronomy Research Council. 2003-01-31. http://www.ing.iac.es/PR/press/ing12003.html. Retrieved 2007-01-05.
- ^ van Boekel, R.; Schöller, M.; Herbst, T. (2003-11-18). "Biggest Star in Our Galaxy Sits within a Rugby-Ball Shaped Cocoon". European Southern Observatory. http://www.eso.org/outreach/press-rel/pr-2003/pr-31-03.html. Retrieved 2007-01-08.
- ^ Milan, W. (2000-03-07). "Possible Hypernova Could Affect Earth". Space.com. http://www.space.com/scienceastronomy/astronomy/milan_eta_carinae_000307.html. Retrieved 2007-01-06.
- ^ Than, K. (2006-07-19). "Mystery of Explosive Star Solved". Space.com. http://www.space.com/scienceastronomy/060719_ophiuchi_nova.html. Retrieved 2007-01-08.
- ^ "Astronomers See Future Supernova Developing". SpaceDaily. 2006-07-25. http://www.spacedaily.com/reports/Astronomers_See_Future_Supernova_Developing_999.html. Retrieved 2006-12-01.
- ^ Thoroughgood, T. D.; et al. (2002). "The recurrent nova U Scorpii — A type Ia supernova progenitor". The Physics of Cataclysmic Variables and Related Objects. 261. San Francisco, CA: Astronomical Society of the Pacific. Bibcode 2002ASPC..261...77T.
- ^ Weaver, D.; Humphreys, R. (2007-01-08). "Astronomers Map a Hypergiant Star's Massive Outbursts". HubbleSite NewsCenter. http://hubblesite.org/newscenter/archive/releases/2007/03/full/. Retrieved 2007-01-16.
- ^ "Supernova Remnants and Neutron Stars". Harvard-Smithsonian Center for Astrophysics. 2008-09-05. http://chandra.harvard.edu/resources/faq/sources/snr/snr-5.html. Retrieved 2011-03-15.
- ^ Kaler, J.. "Regor". University of Illinois. http://www.astro.uiuc.edu/~kaler/sow/regor.html. Retrieved 2007-01-08.
- ^ Kaler, J. (1999-04-09). "WR 104: Pinwheel Star". Astronomy Picture of the Day. http://zuserver2.star.ucl.ac.uk/~apod/apod/ap990409.html. Retrieved 2007-01-08.
- ^ Lloyd, R. (2006-09-04). "Strange Space Pinwheels Spotted". Space.com. http://www.space.com/scienceastronomy/060904_mystery_monday.html. Retrieved 2007-01-08.
- ^ Landsman, W.; Simon, T.; Bergeron, P. (1999). "The hot white-dwarf companions of HR 1608, HR 8210, and HD 15638". Astronomical Society of the Pacific 105 (690): 841–847. Bibcode 1993PASP..105..841L. doi:10.1086/133242.
- ^ Samuel, E. (2002-05-23). "Supernova poised to go off near Earth". New Scientist. http://www.newscientist.com/article.ns?id=dn2311. Retrieved 2007-01-12.
- ^ Tzekova, S. Y.; et al. (2004). "IK Pegasi (HR 8210)". European Southern Observatory. http://www.eso.org/outreach/eduoff/edu-prog/catchastar/CAS2004/casreports-2004/rep-310/. Retrieved 2007-01-12.
- Bethe, H. (September 1990). "SUPERNOVAE. By what mechanism do massive stars explode?". Physics Today 43 (9): 24–27. Bibcode 1990PhT....43i..24B. doi:10.1063/1.881256. http://www.physicstoday.org/vol-43/iss-9/vol43no9p24_27.pdf.
- Croswell, K. (1996). The Alchemy of the Heavens: Searching for Meaning in the Milky Way. Anchor Books. ISBN 0385472145. A popular-science account.
- Filippenko, A. V. (1997). "Optical Spectra of Supernovae". Annual Review of Astronomy and Astrophysics 35 (1): 309–355. Bibcode 1997ARA&A..35..309F. doi:10.1146/annurev.astro.35.1.309. An article describing spectral classes of supernovae.
- Takahashi, K.; Sato, K.; Burrows, A.; Thompson, T. A. (2003). "Supernova Neutrinos, Neutrino Oscillations, and the Mass of the Progenitor Star". Physical Review D 68 (11): 77–81. arXiv:hep-ph/0306056. Bibcode 2003PhRvD..68k3009T. doi:10.1103/PhysRevD.68.113009. A good review of supernova events.
- Hillebrandt, W.; Janka, H.-T.; Müller, E. (2006). "How to Blow Up a Star". Scientific American 295 (4): 42–49. doi:10.1038/scientificamerican1006-42. http://www.sciam.com/article.cfm?chanID=sa026&articleID=000160CC-A71B-150E-A26183414B7F0000.
- Woosley, S.; Janka, H.-T. (2005). "The Physics of Core-Collapse Supernovae". Nature Physics 1 (3): 147–154. arXiv:astro-ph/0601261. Bibcode 2005NatPh...1..147W. doi:10.1038/nphys172.
- List of Supernovae-related Web pages.
- "RSS news feed" (RSS). The Astronomer's Telegram. http://www.astronomerstelegram.org/?rss+supernova. Retrieved 2006-11-28.
- Tsvetkov, D. Yu.; Pavlyuk, N. N.; Bartunov, O. S.; Pskovskii, Yu. P.. "Sternberg Astronomical Institute Supernova Catalogue". Sternberg Astronomical Institute, Moscow University. http://www.sai.msu.su/sn/sncat/. Retrieved 2006-11-28. A searchable catalog.*Tsvetkov, D. Yu.; Pavlyuk, N. N.; Bartunov, O. S.; Pskovskii, Yu. P.. "Sternberg Astronomical Institute Supernova Catalogue". Sternberg Astronomical Institute, Moscow University. http://www.sai.msu.su/sn/sncat/. Retrieved 2006-11-28. A searchable catalog.
- Anonymous (2011-09-04). "The Boom Next Door". Kabummer.com. http://kabummer.com/2011/09/the-great-boom-next-door/. Retrieved 2011-09-04. A short note on SN 2011fe Supernova, the closest supernova after 30 years.
- Anonymous (2007-01-18). "BoomCode". WikiUniversity. http://en.wikiversity.org/wiki/BoomCode. Retrieved 2007-03-17. Professional-grade type II supernova simulator on Wikiversity.
- "List of Supernovae with IAU Designations". IAU: Central Bureau for Astronomical Telegrams. http://www.cbat.eps.harvard.edu/lists/RecentSupernovae.html. Retrieved 2010-10-25.
- Overbye, D. (2008-05-21). "Scientists See Supernova in Action". The New York Times. http://www.nytimes.com/2008/05/22/science/22nova.html. Retrieved 2008-05-21.
Supernovae Classes Related Structure Progenitors Remnants Discovery Lists Notable Research Variable stars PulsatingCepheids and
earlyspectraBeta Cephei · PV TelescopiiMira · Semiregular · Slow irregularOther
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