COROT-1b

COROT-1b^[1][2]

Extrasolar planet		List of extrasolar planets
Size comparison of COROT-1b with Jupiter.
Parent star
Star		COROT-1[2]
Constellation		Monoceros
Right ascension	(α)	6h 48m 19.17s[3]
Declination	(δ)	−3° 06′ 07.78″[3]
Distance		1,560 ly (480 pc)
Spectral type		G0V[2][3]
Orbital elements
Semimajor axis	(a)	0.025±0.001[4] AU
Eccentricity	(e)	~0[3]
Orbital period	(P)	1.5089557±0.0000064[3] d
		(36.214936 h)
Inclination	(i)	85.1±0.5[3]°
Time of transit	(Tt)	2454159.4532±0.0001[3] JD
Physical characteristics
Mass	(m)	1.03±0.12[3] MJ
Radius	(r)	1.49±0.08[3] RJ
Density	(ρ)	380±50[3] kg m-3
Surface gravity	(g)	11.5[5] m/s²
Temperature	(T)	1,898±50[3] K
Discovery information
Discovery date		1 May 2007
Discoverer(s)		Barge et al.
Detection method		Transit
Discovery site		France
Discovery status		Confirmed
Other designations
CoRoT-Exo-1b
Database references
Extrasolar Planets Encyclopaedia		data
SIMBAD		data

COROT-1b^[2] (previously named COROT-Exo-1b)^[1] is an extrasolar planet approximately 1,560 light-years away in the constellation of Monoceros. The planet was discovered orbiting the yellow dwarf star COROT-1 in May 2007. The planet was the first discovery by the French-led COROT Mission.

Detection and discovery

Artist's impression of COROT-1b passing in front of its parent star.

The planet was announced by the COROT mission (a CNES project with European Space Agency participation). The planet is a large hot Jupiter, about 1.49 times the radius of Jupiter and approximately 1.03 times as massive, based on ground observations of the star. Its large size is due to its low density combined with the intense heating of its parent star causing the outer layers of the atmosphere to bloat.

Observation of phases

In May 2009 COROT-1b became the first extrasolar planet for which optical (as opposed to infrared) observations of phases were reported.^[6] These observations suggest that there is not significant heat transfer between the (tidally locked) night and day sides of the planet.^[7]

See also

• 51 Pegasi b
• COROT
• COROT-2b
• TrES-1

Notes and references

1. ^ ^{a b} Schneider, J. (2009-03-10). "Change in CoRoT planets names". Exoplanets mailing list. http://listes.obs.ujf-grenoble.fr/wws/arc/exoplanets/2009-03/msg00003.html. Retrieved 2009-03-19. 
2. ^ ^{a b c d} "Notes for planet CoRoT-1 b". http://exoplanet.eu/planet.php?p1=CoRoT-1&p2=b. Retrieved 2009-03-17. 
3. ^ ^{a b c d e f g h i j k} Barge et al.; Baglin, A.; Auvergne, M.; Rauer, H.; Léger, A.; Schneider, J.; Pont, F.; Aigrain, S. et al. (2008). "Transiting exoplanets from the CoRoT space mission. I. CoRoT-Exo-1b: a low-density short-period planet around a G0V star". Astronomy and Astrophysics 482 (3): L17–L20. Bibcode 2008A&A...482L..17B. doi:10.1051/0004-6361:200809353. 
4. ^ The paper gives the semimajor axis as 4.92 ± 0.08 times the radius of the star, which is estimated at 1.11 ± 0.05 solar radii
5. ^ Calculated using Newtonian gravity: $\textstyle g=\frac{GM}{R^2}$
6. ^ Ignas A. G. Snellen; Ernst J. W. de Mooij; Simon Albrecht (2009-05-28). "The changing phases of extrasolar planet CoRoT-1b". Nature 459 (7246): 543–545. Bibcode 2009Natur.459..543S. doi:10.1038/nature08045. PMID 19478779. http://www.nature.com/nature/journal/v459/n7246/full/nature08045.html. 
7. ^ Andrea Thompson (2009-05-27). "Exoplanet Phases Seen in Optical Light". Space.com. http://www.space.com/scienceastronomy/090527-exoplanet-phases.html. Retrieved 2009-05-27. 

External links

Media related to COROT-1b at Wikimedia Commons

• "COROT discovers its first exoplanet and catches scientists by surprise". European Space Agency. 2007-05-03. http://www.esa.int/esaCP/SEMCKNU681F_index_0.html. Retrieved 2008-06-29. 
• Morelle, Rebecca (2007-05-03). "Space telescope spots new planet". BBC News. http://news.bbc.co.uk/2/hi/science/nature/6611557.stm. Retrieved 2008-06-29. 

Coordinates: 06^h 48^m 19.17^s, −03° 06′ 07.78″