Transiting exoplanets from the CoRoT space mission I - CoRoT-Exo-1b: a low-density short-period planet around a G0V star
P. Barge
(1)
,
A. Baglin
(2)
,
M. Auvergne
(2)
,
H. Rauer
(3)
,
A. Leger
(4)
,
Jodi Schneider
(5)
,
F. Pont
(6, 7)
,
S. Aigrain
(6)
,
J. -M. Almenara
(8)
,
R. Alonso
(1)
,
M. Barbieri
(1)
,
Pascal Bordé
(2, 9, 10)
,
F. Bouchy
(1, 4, 7)
,
H. -J. Deeg
(4)
,
R. de La Reza
(8)
,
M. Deleuil
(1)
,
R. Dvorak
(11)
,
A. Erikson
(3)
,
M. Fridlund
(12)
,
M. Gillon
(12)
,
P. Gondoin
(13)
,
T. Guillot
(14)
,
A. Hatzes
(15)
,
G. Hebrard
(4)
,
L. Jorda
(1)
,
P. Kabath
(3)
,
H. Lammer
(16)
,
A. Llebaria
(1)
,
B. Loeillet
(1)
,
P. Magain
(8)
,
T. Mazeh
(17)
,
C. Moutou
(1, 18)
,
M. Ollivier
(9)
,
M. Patzold
(19)
,
D. Queloz
(7)
,
D. Rouan
(10, 20)
,
A. Shporer
(6)
,
G. Wuchterl
(15)
1
LAM -
Laboratoire d'Astrophysique de Marseille
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 DLR Institute of Planetary Research
4 IAP - Institut d'Astrophysique de Paris
5 LUTH (UMR_8102) - Laboratoire Univers et Théories
6 School of Physics
7 ObsGE - Observatoire Astronomique de l'Université de Genève
8 IAC - Instituto de Astrofisica de Canarias
9 IAS - Institut d'astrophysique spatiale
10 DESPA - Departement de recherche SPAtiale
11 ON/MCT, 20921-030, Rio de Janeiro, Brazil) - ON/MCT
12 RSSD - Research and Scientific Support Department, ESTEC
13 Geneva Observatory
14 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
15 TLS - Thüringer Landessternwarte Tautenburg
16 IWF - Space Research Institute of Austrian Academy of Sciences
17 TAU - School of Physics and Astronomy [Tel Aviv]
18 ESO - European Southern Observatory
19 IGM - Institute for Geophysics and Meteorology [Köln]
20 OP - Observatoire de Paris - Site de Paris
2 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
3 DLR Institute of Planetary Research
4 IAP - Institut d'Astrophysique de Paris
5 LUTH (UMR_8102) - Laboratoire Univers et Théories
6 School of Physics
7 ObsGE - Observatoire Astronomique de l'Université de Genève
8 IAC - Instituto de Astrofisica de Canarias
9 IAS - Institut d'astrophysique spatiale
10 DESPA - Departement de recherche SPAtiale
11 ON/MCT, 20921-030, Rio de Janeiro, Brazil) - ON/MCT
12 RSSD - Research and Scientific Support Department, ESTEC
13 Geneva Observatory
14 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
15 TLS - Thüringer Landessternwarte Tautenburg
16 IWF - Space Research Institute of Austrian Academy of Sciences
17 TAU - School of Physics and Astronomy [Tel Aviv]
18 ESO - European Southern Observatory
19 IGM - Institute for Geophysics and Meteorology [Köln]
20 OP - Observatoire de Paris - Site de Paris
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
C. Moutou
- Fonction : Auteur
- PersonId : 1156835
- IdHAL : claire-moutou
- ORCID : 0000-0002-2842-3924
- IdRef : 10151218X
Résumé
Context. The pioneer space mission for photometric planet searches, CoRoT, steadily monitors about 12,000 stars in each of its fields of view; it is able to detect transit candidates early in the processing of the data and before the end of a run. Aims. We report the detection of the first planet discovered by CoRoT and characterizing it with the help of follow-up observations. Methods. Raw data were filtered from outliers and residuals at the orbital period of the satellite. The orbital parameters and the radius of the planet were estimated by best fitting the phase folded light curve with 34 successive transits. Doppler measurements with the SOPHIE spectrograph permitted us to secure the detection and to estimate the planet mass. Results. The accuracy of the data is very high with a dispersion in the 2.17 min binned phase-folded light curve that does not exceed 3.10-4 in flux unit. The planet orbits a mildly metal-poor G0V star of magnitude V=13.6 in 1.5 days. The estimated mass and radius of the star are 0.95+-0.15Msun and 1.11+-0.05Rsun. We find the planet has a radius of 1.49+-0.08Rjup, a mass of 1.03+-0.12Mjup, and a particularly low mean density of 0.38 +-0.05g cm-3.