Published 2008
| Version v1
Journal article
Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an active G star
Creators
- Alonso, Roi
- Auvergne, Michel
- Baglin, Annie
- Ollivier, Marc
- Moutou, Claire
- Rouan, Daniel
- Deeg, Hans J.
- Aigrain, Suzanne
- Almenara, J. M.
- Barbieri, Mauro
- Barge, Pierre
- Benz, Willy
- Bordé, P.
- Bouchy, François
- de la Reza, R.
- Deleuil, Magali
- Dvorak, Rudolf
- Erikson, Anders
- Fridlund, Malcolm C.
- Gillon, Michel
- Gondoin, Philippe
- Guillot, Tristan
- Hatzes, Artie P.
- Hébrard, Guillaume
- Kabath, P.
- Jorda, Laurent
- Lammer, Helmut
- Léger, Alain
- Llebaria, Antoine
- Loeillet, B.
- Magain, Pierre
- Mayor, Michel
- Mazeh, Tsevi
- Pätzold, M.
- Pepe, Francesco
- Pont, Frédéric
- Queloz, Didier
- Rauer, Heike
- Shporer, A.
- Schneider, Jean
- Stecklum, Bringfried
- Udry, Stéphane
- Wuchterl, Günther
Contributors
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)
- Pôle Astronomie du LESIA ; 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)-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) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Instituto de Astrofísica de Canarias (IAC)
- School of Physics, University of Exeter
- Physikalisches Institut, Universität Bern
- Institut d'Astrophysique de Paris (IAP) ; Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)
- Observatório Nacional/MCTI
- Institut für Astronomie, Universität Wien (IfA)
- Institute of Planetary Research, Deutsches Zentrum für Luft- und Raumfahrt (DLR)
- Research and Scientific Support Department, ESA-ESTEC (RSSD)
- Observatoire Astronomique de l'Université de Genève
- Observatoire de la Côte d'Azur (OCA) ; Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)
- Thüringer Landessternwarte, Tautenburg Observatory
- Institut für Weltraumforschung, Österreichische Akademie der Wissenschaften (IWF)
- Institut d'Astrophysique, Géophysique et Océanographie, Université de Liège
- Tel Aviv University [Tel Aviv]
- Rheinisches Institut für Umweltforschung an der Universität zu Köln (RIU)
- 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 ~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 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.
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 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
International audienceAdditional details
Identifiers
- URL
- https://hal.archives-ouvertes.fr/hal-03786026
- URN
- urn:oai:HAL:hal-03786026v1