Transiting exoplanets from the CoRoT space mission II. CoRoT-Exo-2b: A transiting planet around an active G star
R. Alonso
(1)
,
M. Auvergne
(2)
,
A. Baglin
(2)
,
M. Ollivier
(3)
,
C. Moutou
(1, 4)
,
D. Rouan
(5, 6)
,
H. J. Deeg
(7)
,
S. Aigrain
(8)
,
J. M. Almenara
(9)
,
M. Barbieri
(1)
,
P. Barge
(1)
,
W. Benz
(10)
,
Pascal Bordé
(3)
,
F. Bouchy
(7, 11)
,
R. de La Reza
(9)
,
M. Deleuil
(1)
,
R. Dvorak
(12)
,
A. Erikson
(13)
,
M. Fridlund
(14)
,
M. Gillon
(14)
,
P. Gondoin
(15)
,
T. Guillot
(16)
,
A. Hatzes
(17)
,
G. Hébrard
(7)
,
P. Kabath
(13)
,
L. Jorda
(1)
,
H. Lammer
(18)
,
A. Léger
(7)
,
A. Llebaria
(1)
,
B. Loeillet
(1)
,
P. Magain
(9)
,
M. Mayor
(11)
,
T. Mazeh
(19)
,
M. Pätzold
(20)
,
F. Pepe
(11)
,
F. Pont
(8, 15, 11)
,
D. Queloz
(11)
,
H. Rauer
(13)
,
A. Shporer
(8)
,
Jodi Schneider
(21)
,
B. Stecklum
(17)
,
S. Udry
(11)
,
G. Wuchterl
(17)
1
LAM -
Laboratoire d'Astrophysique de Marseille
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 IAS - Institut d'astrophysique spatiale
4 ESO - European Southern Observatory
5 OP - Observatoire de Paris - Site de Paris
6 DESPA - Departement de recherche SPAtiale
7 IAP - Institut d'Astrophysique de Paris
8 School of Physics
9 IAC - Instituto de Astrofisica de Canarias
10 Physikalisches Institut [Bern]
11 ObsGE - Observatoire Astronomique de l'Université de Genève
12 ON/MCT, 20921-030, Rio de Janeiro, Brazil) - ON/MCT
13 DLR Institute of Planetary Research
14 RSSD - Research and Scientific Support Department, ESTEC
15 Geneva Observatory
16 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
17 TLS - Thüringer Landessternwarte Tautenburg
18 IWF - Space Research Institute of Austrian Academy of Sciences
19 TAU - School of Physics and Astronomy [Tel Aviv]
20 IGM - Institute for Geophysics and Meteorology [Köln]
21 LUTH (UMR_8102) - Laboratoire Univers et Théories
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 IAS - Institut d'astrophysique spatiale
4 ESO - European Southern Observatory
5 OP - Observatoire de Paris - Site de Paris
6 DESPA - Departement de recherche SPAtiale
7 IAP - Institut d'Astrophysique de Paris
8 School of Physics
9 IAC - Instituto de Astrofisica de Canarias
10 Physikalisches Institut [Bern]
11 ObsGE - Observatoire Astronomique de l'Université de Genève
12 ON/MCT, 20921-030, Rio de Janeiro, Brazil) - ON/MCT
13 DLR Institute of Planetary Research
14 RSSD - Research and Scientific Support Department, ESTEC
15 Geneva Observatory
16 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
17 TLS - Thüringer Landessternwarte Tautenburg
18 IWF - Space Research Institute of Austrian Academy of Sciences
19 TAU - School of Physics and Astronomy [Tel Aviv]
20 IGM - Institute for Geophysics and Meteorology [Köln]
21 LUTH (UMR_8102) - Laboratoire Univers et Théories
C. Moutou
- Fonction : Auteur
- PersonId : 1156835
- IdHAL : claire-moutou
- ORCID : 0000-0002-2842-3924
- IdRef : 10151218X
J. M. Almenara
- Fonction : Auteur
- PersonId : 760392
- ORCID : 0000-0003-3208-9815
M. Barbieri
- Fonction : Auteur
- PersonId : 760395
- ORCID : 0000-0001-8362-3462
Pascal Bordé
- Fonction : Auteur
- PersonId : 651
- IdHAL : pascal-borde
- IdRef : 059503793
M. Deleuil
- Fonction : Auteur
- PersonId : 174546
- IdHAL : magali-deleuil
- ORCID : 0000-0001-6036-0225
- IdRef : 095234209
M. Fridlund
- Fonction : Auteur
- PersonId : 760393
- ORCID : 0000-0002-0855-8426
- IdRef : 095236449
M. Gillon
- Fonction : Auteur
- PersonId : 756643
- ORCID : 0000-0003-1462-7739
T. Guillot
- Fonction : Auteur
- PersonId : 16166
- IdHAL : tristanguillot
- ORCID : 0000-0002-7188-8428
- IdRef : 110334965
L. Jorda
- Fonction : Auteur
- PersonId : 746464
- IdHAL : laurent-jorda
- ORCID : 0000-0001-8735-3308
- IdRef : 180975161
S. Udry
- Fonction : Auteur
- PersonId : 755482
- ORCID : 0000-0001-7576-6236
Résumé
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.