COROT-Exo-2b

Planetbox begin
name = COROT-Exo-2b| Planetbox star
star = COROT-Exo-2
constell = Serpens
dist_ly = 930
dist_pc = 290
RA = 19^h 27^m#ifeq: 06.5|06.5| 06.5^s|cite journal
url = http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008A%26A...482L..21A&db_key=AST&nosetcookie=1
author = Alonso, R.; Auvergne, M.; Baglin, A.; Ollivier, M.; Moutou, C.; Rouan, D.; Deeg, H. J.; Aigrain, S.; Almenara, J. M.; Barbieri, M.; Barge, P.; Benz, W.; Bordé, P.; Bouchy, F.; de La Reza, R.; Deleuil, M.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gillon, M.; Gondoin, P.; Guillot, T.; Hatzes, A.; Hébrard, G.; Kabath, P.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Loeillet, B.; Magain, P.; Mayor, M.; Mazeh, T.; Pätzold, M.; Pepe, F.; Pont, F.; Queloz, D.; Rauer, H.; Shporer, A.; Schneider, J.; Stecklum, B.; Udry, S.; Wuchterl, G.
title = Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an active G star
journal = Astronomy and Astrophysics
volume = 482
issue = 3
year = 2008
pages = L21–L24 ]
DEC = +1° 23′#ifeq: 01.5|01.5| 01.5″|
class = G7Vcite journal
url = http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2008A%26A...482L..25B&db_key=AST&nosetcookie=1
author = Bouchy, F.; Queloz, D.; Deleuil, M.; Loeillet, B.; Hatzes, A. P.; Aigrain, S.; Alonso, R.; Auvergne, M.; Baglin, A.; Barge, P.; Benz, W.; Bordé, P.; Deeg, H. J.; de La Reza, R.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gondoin, P.; Guillot, T.; Hébrard, G.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Magain, P.; Mayor, M.; Moutou, C.; Ollivier, M.; Pätzold, M.; Pepe, F.; Pont, F.; Rauer, H.; Rouan, D.; Schneider, J.; Triaud, A. H. M. J.; Udry, S.; Wuchterl, G.
title = Transiting exoplanets from the CoRoT space mission. III. The spectroscopic transit of CoRoT-Exo-2b with SOPHIE and HARPS
journal = Astronomy and Astrophysics
volume = 482
issue = 3
year = 2008
pages = L25–L28 ] Planetbox orbit
semimajor = 0.0281 ± 0.0005 [The paper gives the semimajor axis as 6.70 ± 0.03 times the radius of the star, which is estimated at 0.902 ± 0.018 solar radii.]
eccentricity = 0 (assumed)
period = 1.7429964 ± 0.0000017
inclination = 87.84 ± 0.10
t_transit = 2454237.53562 ± 0.00014Planetbox character
mass = 3.31 ± 0.16
radius = 1.429 ± 0.047
density = 1310 ± 40
gravity = 38.2 [Calculated using Newtonian gravity: $extstyle\; g=frac\{GM\}\{R^2\}$]
temperature = 1537 ± 35 Planetbox discovery
discovery_date = 2007-12-??, announced 2007-12-20
discoverers = Corot mission
discovery_method = Transit method
discovery_site = Earth's orbit
discovery_status = Confirmed

COROT-Exo-2b is the second extrasolar planet to be detected by the French-led COROT mission, which orbits the star COROT-Exo-2 at a distance of 930 light years from Earth towards the constellation Serpens. Its discovery was announced on 20 December 2007. [cite web | title = COROT surprises a year after launch | url = http://www.esa.int/SPECIALS/COROT/SEMF0C2MDAF_0.html | accessdate = 2007-12-21]

The planet is a large hot jupiter, about 1.43 times the radius of Jupiter and approximately 3.3 times as massive. Its huge size is due to the intense heating from its parent star, which causes the outer layers of its atmosphere to bloat. The extremely large radius of the planet indicates that Corot-Exo-2b is really hot, estimated to be around 1500 K, even hotter than would be expected given its location close to its parent star. At Jupiter-like distances its radius would roughly be the same as JupiterFact|date=May 2008. This fact may be a sign of tidal heating due to interactions with another planet. [cite web | title = CoRoT-exo-2 c? | url = http://oklo.org/?p=262 | accessdate = 2007-12-21]

COROT-exo-2b orbits its star approximately once every 1.7 days, and orbits the star in a prograde direction close to the star's equator. Its parent star is a G-type star, a bit cooler than the Sun but more active. It is located about 800 light-years from Earth, in the direction of the constellation Serpens.

Orbit

As of August 2008, the COROT-Exo-2b spin-orbit angle (that is, the angle between the equator of the star and the plane of the planet orbit) was calculated by Bouchy "et al." by mean of the Rossiter-McLaughlin effect [cite arXiv | title= Measuring accurate transit parameters | author=Joshua N. Winn | eprint=0807.4929v2 |class=astro-ph |year=2008] with a value of +7.2 ± 4.5 degrees. [cite journal| journal=A&A |volume=482 |page=L25| title= | author=Bouchy "et al." |year=2008]

References

External links

* [http://exoplanet.eu/planet.php?p1=CoRoT-Exo-2&p2=b COROT-Exo-2 on the Extrasolar Planets Encyclopaedia]
* [http://www.perseus.gr/Astro-Photometry-CoRoTExo2-20080606.htm COROT-Exo-2 light curve using differential photometry]