ORBi: Gillon Michaël - The thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8 μm

Reference : The thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8 μm


	Document type :	Scientific journals : Article
	Discipline(s) :	Physical, chemical, mathematical & earth Sciences : Space science, astronomy & astrophysics
	To cite this reference:	http://hdl.handle.net/2268/4658

Title :	The thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8 μm
Language :	English
Author, co-author :	Gillon, Michaël [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
	Lanotte, Audrey [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
	Barman, T. [Lowell Observatory, 1400 West Mars Hill Road, Flagstaff, AZ 86001, USA]
	Miller, N. [Department of Astronomy and Astrophysics, University of California, Santa Cruz, USA]
	Demory, B.-O. [Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland]
	Deleuil, M. [LAM, UMR 6110 CNRS, 38 rue Frédéric Joliot-Curie, 13388 Marseille, France]
	Montalban Iglesias, Josefa [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie >]
	Bouchy, F. [Observatoire de Haute Provence, USR 2207 CNRS, OAMP, 04870 St-Michel l'Observatoire, France]
	Collier Cameron, A. [School of Physics and Astronomy, University of St. Andrews, North Haugh, Fife, KY16 9SS, UK]
	Deeg, H. J. [Instituto de Astrofísica de Canarias, C. Via Lactea S/N, 38200 La Laguna, Spain]
	Fortney, J. J. [Department of Astronomy and Astrophysics, University of California, Santa Cruz, USA]
	Fridlund, M. [Research and Scientific Support Department, European Space Agency, ESTEC, 220 Noordwijk, The Netherlands]
	Harrington, J. [Planetary Sciences Group, Department of Physics, University of Central Florida, Orlando, FL 32816, USA]
	Magain, Pierre [Université de Liège - ULg > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image >]
	Moutou, C. [LAM, UMR 6110 CNRS, 38 rue Frédéric Joliot-Curie, 13388 Marseille, France]
	Queloz, D. [Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland]
	Rauer, H. [Institut für Planetenforschung, DLR, Rutherford str. 2, 12489 Berlin, Germany; Zentrum für Astronomie und Astrophysik, Hardenbergstr. 36, 10623 Berlin, Germany]
	Rouan, D. [LESIA, UMR 8109 CNRS, Observatoire de Paris, UVSQ, Université Paris-Diderot, 5 Place J. Janssen, 92195 Meudon, France]
	Schneider, J. [LUTH, UMR 8102 CNRS, Observatoire de Paris-Meudon, 5 Place J. Janssen, 92195 Meudon, France)]
Publication date :	1-Feb-2010
Journal title :	Astronomy and Astrophysics
Publisher :	EDP Sciences
Volume :	511
Pages :	3-26
Audience :	International
ISSN :	0004-6361
e-ISSN :	1432-0746
City :	Les Ulis
Country :	France
Keywords :	[en] Astrophysics - Earth and Planetary Astrophysics
Abstract :	[en] We report measurements of the thermal emission of the young and massive planet CoRoT-2b at 4.5 and 8 microns with the Spitzer Infrared Array Camera (IRAC). Our measured occultation depths are 0.510 +- 0.042 % and 0.41 +- 0.11 % at 4.5 and 8 microns, respectively. In addition to the CoRoT optical measurements, these planet/star flux ratios indicate a poor heat distribution to the night side of the planet and are in better agreement with an atmosphere free of temperature inversion layer. Still, the presence of such an inversion is not definitely ruled out by the observations and a larger wavelength coverage is required to remove the current ambiguity. Our global analysis of CoRoT, Spitzer and ground-based data confirms the large mass and size of the planet with slightly revised values (Mp = 3.47 +- 0.22 Mjup, Rp = 1.466 +- 0.044 Rjup). We find a small but significant offset in the timing of the occultation when compared to a purely circular orbital solution, leading to e cos(omega) = -0.00291 +- 0.00063 where e is the orbital eccentricity and omega is the argument of periastron. Constraining the age of the system to be at most of a few hundreds of Myr and assuming that the non-zero orbital eccentricity is not due to a third undetected body, we model the coupled orbital-tidal evolution of the system with various tidal Q values, core sizes and initial orbital parameters. For log(Q_s') = 5 - 6, our modelling is able to explain the large radius of CoRoT-2b if log(Q_p') <= 5.5 through a transient tidal circularization and corresponding planet tidal heating event. Under this model, the planet will reach its Roche limit within 20 Myr at most.
Permalink :	http://hdl.handle.net/2268/4658
	also: http://hdl.handle.net/2268/130377
DOI :	10.1051/0004-6361/200913507
Other URL :	http://adsabs.harvard.edu/abs/2009arXiv0911.5087G
	http://de.arxiv.org/abs/0911.5087
Mentions required by the publisher for OA :	The authors thank EDP Sciences for their deposit authorization.
Commentary :	0911 <br />5087 <br />13 pages, 2 tables, 11 figures. Accepted for publication in Astronomy and Astrophysics

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