Transiting exoplanets from the CoRoT space mission II. CoRoT-Exo-2b: A transiting planet around an active G star
- Creators
- 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, Pascal
- 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, Jodi
- Stecklum, B.
- Udry, S.
- Wuchterl, G.
- Others:
- Laboratoire d'Astrophysique de Marseille (LAM) ; Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales [Toulouse] (CNES)-Centre National de la Recherche Scientifique (CNRS)
- Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA) ; Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
- Institut d'astrophysique spatiale (IAS) ; Université Paris-Sud - Paris 11 (UP11)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- European Southern Observatory (ESO)
- Observatoire de Paris - Site de Paris (OP) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
- Departement de recherche SPAtiale (DESPA) ; Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)
- Institut d'Astrophysique de Paris (IAP) ; Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- School of Physics ; University of Exeter
- Instituto de Astrofisica de Canarias (IAC)
- Physikalisches Institut [Bern] ; Universität Bern [Bern] (UNIBE)
- Observatoire Astronomique de l'Université de Genève (ObsGE) ; Université de Genève = University of Geneva (UNIGE)
- ON/MCT (ON/MCT, 20921-030, Rio de Janeiro, Brazil)) ; ON/MCT
- DLR Institute of Planetary Research ; German Aerospace Center (DLR)
- Research and Scientific Support Department, ESTEC (RSSD) ; European Space Research and Technology Centre (ESTEC) ; European Space Agency (ESA)-European Space Agency (ESA)
- Geneva Observatory ; Université de Genève = University of Geneva (UNIGE)
- Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides (CASSIOPEE) ; Université Nice Sophia Antipolis (1965 - 2019) (UNS) ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de la Côte d'Azur ; COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Université Côte d'Azur (UCA)-Université Côte d'Azur (UCA)-Centre National de la Recherche Scientifique (CNRS)
- Thüringer Landessternwarte Tautenburg (TLS)
- Space Research Institute of Austrian Academy of Sciences (IWF) ; Austrian Academy of Sciences (OeAW)
- School of Physics and Astronomy [Tel Aviv] ; Tel Aviv University [Tel Aviv]
- Institute for Geophysics and Meteorology [Köln] (IGM) ; University of Cologne
- Laboratoire Univers et Théories (LUTH (UMR_8102)) ; Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris ; Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
Description
Context. The CoRoT mission, a pioneer in exoplanet searches from space, has completed its first 150 days of continuous observations of ~12000 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 spectro-graphs 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 1.09x10-4 in flux units. Results. We derive a radius for the planet of 1.465+-0.029 R_Jup and a mass of 3.31+-0.16 M_Jup, 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.
Abstract
A&A Letters (in press), 7 pages, 3 figures
Abstract
International audience
Additional details
- URL
- https://hal.archives-ouvertes.fr/hal-00325089
- URN
- urn:oai:HAL:hal-00325089v1
- Origin repository
- UNICA