• DOI:10.1051/0004-6361:200809431
• Corpus ID: 14288300

Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an

@article{Alonso2008TransitingEF,
  title={Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an},
  author={Roi Alonso and Michel Auvergne and Annie Baglin and Marc Ollivier and Claire Moutou and Daniel Rouan and Hans J. Deeg and Suzanne Aigrain and Jose M. Almenara and Mauro Barbieri and Pierre Barge and W. Benz and P. Bord'e and François Bouchy and Ramiro de la Reza and Magali Deleuil and Rudolf Dvorak and Anders Erikson and Malcolm Fridlund and Micha{\"e}l Gillon and Ph. Gondoin and Tristan Guillot and A. P. Hatzes and Guillaume H'ebrard and Petr Kab{\'a}th and Laurent Jorda and Helmut Lammer and Alain L'eger and Antoine Llebaria and B. Loeillet and Pierre Magain and Michel Mayor and Tsevi Mazeh and Martin Patzold and Francesco A. Pepe and Fr'ed'eric Pont and Didier Queloz and Heike Rauer and Avi Shporer and Jodi Schneider and B. Stecklum and St{\'e}phane Udry and G{\"u}nther Wuchterl},
  journal={Astronomy and Astrophysics},
  year={2008}
}

• R. Alonso, M. Auvergne, +40 authors G. Wuchterl
• Published 21 March 2008
• Physics, Geology
• Astronomy and Astrophysics

Context. The CoRoT mission, a pioneer in exoplanet searches from space, has completed its first 150 days of continuous observations of ∼12 000 stars in the galactic plane. An analysis of the raw data identifies the most promising candidates and triggers the ground-based follow-up. Aims. We report on the discovery of the transiting planet CoRoT-Exo-2b, with a period of 1.743 days, and characterize its main parameters. Methods. We filter the CoRoT raw light curve of cosmic impacts, orbital residuals, and low frequency signals from the star. The folded light curve of 78 transits is fitted to a model to obtain the main parameters. Radial velocity data obtained with the SOPHIE, CORALIE and HARPS spectrographs are combined to characterize the system. The 2.5 min binned phase-folded light curve is affected by the effect of sucessive occultations of stellar active regions by the planet, and the dispersion in the out of transit part reaches a level of 1.09 × 10 −4 in flux units. Results. We derive a radius for the planet of 1.465 ± 0.029 RJup and a mass of 3.31 ± 0.16 MJup, corresponding to a density of 1.31 ± 0.04 g/cm 3 . The large radius of CoRoT-Exo-2b cannot be explained by current models of evolution of irradiated planets.