Transiting exoplanets from the CoRoT space mission XXI. CoRoT-19b: A low density planet orbiting an old inactive F9V-star
E. W. Guenther
(1)
,
R. F. Diaz
(2, 3)
,
J. -C. Gazzano
(4)
,
T. Mazeh
(5)
,
D. Rouan
(6)
,
N. Gibson
(7)
,
Sz. Csizmadia
(8)
,
S. Aigrain
(7)
,
R. Alonso
(9)
,
J. M. Almenara
(10)
,
M. Auvergne
(6)
,
A. Baglin
(6)
,
P. Barge
(11)
,
A. S. Bonomo
(11)
,
Pascal Bordé
(12)
,
F. Bouchy
(2, 3)
,
H. Bruntt
(13)
,
J. Cabrera
(14)
,
L. Carone
(15)
,
S. Carpano
(16)
,
C. Cavarroc
(12)
,
H. J. Deeg
(10)
,
M. Deleuil
(11)
,
S. Dreizler
(17)
,
R. Dvorak
(18)
,
A. Erikson
(14)
,
S. Ferraz-Mello
(19)
,
M. Fridlund
(16)
,
D. Gandolfi
(16)
,
M. Gillon
(20)
,
T. Guillot
(4, 21)
,
A. Hatzes
(1)
,
M. Havel
(21, 4)
,
G. Hebrard
(2)
,
E. Jehin
(20)
,
L. Jorda
(11)
,
H. Lammer
(22)
,
A. Leger
(12)
,
C. Moutou
(11)
,
L. Nortmann
(17)
,
M. Ollivier
(12)
,
A. Ofir
(5)
,
Th. Pasternacki
(23)
,
M. Paetzold
(15)
,
H. Parviainen
(10)
,
D. Queloz
(9)
,
H. Rauer
(23, 24)
,
B. Samuel
(12)
,
A. Santerne
(11, 3)
,
Jodi Schneider
(25)
,
L. Tal-Or
(5)
,
B. Tingley
(10)
,
J. Weingrill
(22)
,
G. Wuchterl
(1)
1
TLS -
Thüringer Landessternwarte Tautenburg
2 IAP - Institut d'Astrophysique de Paris
3 OHP - Observatoire de Haute-Provence
4 Observatoire de la Côte d'Azur
5 TAU - School of Physics and Astronomy [Tel Aviv]
6 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
7 Department of Physics [Oxford]
8 DLR Institute of Planetary Research
9 ObsGE - Observatoire Astronomique de l'Université de Genève
10 IAC - Instituto de Astrofisica de Canarias
11 LAM - Laboratoire d'Astrophysique de Marseille
12 IAS - Institut d'astrophysique spatiale
13 Department of Physics and Astronomy [Aarhus]
14 DLR - German Aerospace Center
15 RIU - Rheinisches Institut für Umweltforschung
16 ESTEC - European Space Research and Technology Centre
17 Georg-August-University = Georg-August-Universität Göttingen
18 Universität Wien = University of Vienna
19 Universidade Federal de São Paulo
20 Institut d'Astrophysique et de Géophysique [Liège]
21 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
22 IWF - Space Research Institute of Austrian Academy of Sciences
23 German Aerospace Centre (DLR), Institute of Aerodynamics & Flow Technology
24 TU - Technical University of Berlin / Technische Universität Berlin
25 LUTH (UMR_8102) - Laboratoire Univers et Théories
2 IAP - Institut d'Astrophysique de Paris
3 OHP - Observatoire de Haute-Provence
4 Observatoire de la Côte d'Azur
5 TAU - School of Physics and Astronomy [Tel Aviv]
6 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique = Laboratory of Space Studies and Instrumentation in Astrophysics
7 Department of Physics [Oxford]
8 DLR Institute of Planetary Research
9 ObsGE - Observatoire Astronomique de l'Université de Genève
10 IAC - Instituto de Astrofisica de Canarias
11 LAM - Laboratoire d'Astrophysique de Marseille
12 IAS - Institut d'astrophysique spatiale
13 Department of Physics and Astronomy [Aarhus]
14 DLR - German Aerospace Center
15 RIU - Rheinisches Institut für Umweltforschung
16 ESTEC - European Space Research and Technology Centre
17 Georg-August-University = Georg-August-Universität Göttingen
18 Universität Wien = University of Vienna
19 Universidade Federal de São Paulo
20 Institut d'Astrophysique et de Géophysique [Liège]
21 CASSIOPEE - Laboratoire de Cosmologie, Astrophysique Stellaire & Solaire, de Planétologie et de Mécanique des Fluides
22 IWF - Space Research Institute of Austrian Academy of Sciences
23 German Aerospace Centre (DLR), Institute of Aerodynamics & Flow Technology
24 TU - Technical University of Berlin / Technische Universität Berlin
25 LUTH (UMR_8102) - Laboratoire Univers et Théories
J. M. Almenara
- Fonction : Auteur
- PersonId : 760392
- ORCID : 0000-0003-3208-9815
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
D. Gandolfi
- Fonction : Auteur
- PersonId : 761173
- ORCID : 0000-0001-8627-9628
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
E. Jehin
- Fonction : Auteur
- PersonId : 759915
- ORCID : 0000-0001-8923-488X
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
Observations of transiting extrasolar planets are of key importance to our understanding of planets because their mass, radius, and mass density can be determined. The CoRoT space mission allows us to achieve a very high photometric accuracy. By combining CoRoT data with high-precision radial velocity measurements, we derive precise planetary radii and masses. We report the discovery of CoRoT-19b, a gas-giant planet transiting an old, inactive F9V-type star with a period of four days. After excluding alternative physical configurations mimicking a planetary transit signal, we determine the radius and mass of the planet by combining CoRoT photometry with high-resolution spectroscopy obtained with the echelle spectrographs SOPHIE, HARPS, FIES, and SANDIFORD. To improve the precision of its ephemeris and the epoch, we observed additional transits with the TRAPPIST and Euler telescopes. Using HARPS spectra obtained during the transit, we then determine the projected angle between the spin of the star and the orbit of the planet. We find that the host star of CoRoT-19b is an inactive F9V-type star close to the end of its main-sequence life. The host star has a mass M*=1.21+/-0.05 Msun and radius R*=1.65+/-0.04 Rsun. The planet has a mass of Mp=1.11+/-0.06 Mjup and radius of Rp=1.29+/-0.03 Rjup. The resulting bulk density is only rho=0.71+/-0.06 gcm-3, which is much lower than that for Jupiter. The exoplanet CoRoT-19b is an example of a giant planet of almost the same mass as Jupiter but a 30% larger radius.