Transiting exoplanets from the CoRoT space mission: XXVII. CoRoT-28b, a planet orbiting an evolved star, and CoRoT-29b, a planet showing an asymmetric transit
Journal article, 2015
© ESO, 2015. Context. We present the discovery of two transiting extrasolar planets by the satellite CoRoT. Aims. We aim at a characterization of the planetary bulk parameters, which allow us to further investigate the formation and evolution of the planetary systems and the main properties of the host stars. Methods. We used the transit light curve to characterize the planetary parameters relative to the stellar parameters. The analysis of HARPS spectra established the planetary nature of the detections, providing their masses. Further photometric and spectroscopic ground-based observations provided stellar parameters (log g, T
eff
, vsini) to characterize the host stars. Our model takes the geometry of the transit to constrain the stellar density into account, which when linked to stellar evolutionary models, determines the bulk parameters of the star. Because of the asymmetric shape of the light curve of one of the planets, we had to include the possibility in our model that the stellar surface was not strictly spherical. Results. We present the planetary parameters of CoRoT-28b, a Jupiter-sized planet (mass 0.484 ± 0.087 M
Jup
; radius 0.955 ± 0.066 R
Jup
) orbiting an evolved star with an orbital period of 5.208 51 ± 0.000 38 days, and CoRoT-29b, another Jupiter-sized planet (mass 0.85 ± 0.20 M
Jup
; radius 0.90 ± 0.16 R
Jup
) orbiting an oblate star with an orbital period of 2.850 570 ± 0.000 006 days. The reason behind the asymmetry of the transit shape is not understood at this point. Conclusions. These two new planetary systems have very interesting properties and deserve further study, particularly in the case of the star CoRoT-29.
Techniques: spectroscopic
Techniques: photometric
Planetary systems
Techniques: radial velocities
Author
J. Cabrera
German Aerospace Center (DLR)
S. Csizmadia
German Aerospace Center (DLR)
G. Montagnier
Pierre and Marie Curie University (UPMC)
Malcolm Fridlund
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
M. Ammler-Von Eiff
S. Chaintreuil
Paris Diderot University
C. Damiani
Laboratoire d'Astrophysique de Marseille
M. Deleuil
Laboratoire d'Astrophysique de Marseille
S. Ferraz-Mello
University of Sao Paulo (USP)
A. Ferrigno
Paris Diderot University
D. Gandolfi
Heidelberg University
T. Guillot
Université Nice Sophia Antipolis (UNS)
E. W. Guenther
Institut fur Weltraumforschung
A. Hatzes
G. Hebrard
Pierre and Marie Curie University (UPMC)
P. Klagyivik
Instituto de Astrofísica de Canarias
University of La Laguna
H. Parviainen
University of Oxford
T. Pasternacki
German Aerospace Center (DLR)
M. Patzold
University of Cologne
D. Sebastian
M. T. dos Santos
University of Sao Paulo (USP)
G. Wuchterl
S. Aigrain
University of Oxford
R. Alonso
University of La Laguna
Instituto de Astrofísica de Canarias
J. M. Almenara
Laboratoire d'Astrophysique de Marseille
J.D. Armstrong
Las Cumbres Observatory Global Telescope Network
University of Hawaii
M. Auvergne
Paris Diderot University
A. Baglin
Paris Diderot University
P. Barge
Laboratoire d'Astrophysique de Marseille
S.C.C. Barros
Laboratoire d'Astrophysique de Marseille
A. S. Bonomo
Istituto nazionale di astrofisica (INAF)
P. Bordé
Laboratoire d'Astrophysique de Bordeaux
F. Bouchy
Laboratoire d'Astrophysique de Marseille
S. Carpano
Max Planck Society
C. Chaffey
Torrance High School
H. J. Deeg
Instituto de Astrofísica de Canarias
University of La Laguna
R. F. Diaz
University of Geneva
R. Dvorak
University of Vienna
A. Erikson
German Aerospace Center (DLR)
S. Grziwa
University of Cologne
J. Korth
University of Cologne
H. Lammer
Institut fur Weltraumforschung
C. Lindsay
Iolani School
T. Mazeh
Tel Aviv University
C. Moutou
Laboratoire d'Astrophysique de Marseille
CFHT Corporation
A. Ofir
University of Göttingen
M. Ollivier
University of Paris-Sud
E. Palle
Instituto de Astrofísica de Canarias
University of La Laguna
H. Rauer
German Aerospace Center (DLR)
Technische Universität Berlin
D. Rouan
Paris Diderot University
B. Samuel
Paris Diderot University
A. Santerne
University of Porto
J. Schneider
Paris Diderot University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 579 A36Subject Categories
Fusion, Plasma and Space Physics
DOI
10.1051/0004-6361/201424501