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
Artikel i vetenskaplig tidskrift, 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
Författare
J. Cabrera
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Csizmadia
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
G. Montagnier
Université Pierre et Marie Curie (UPMC)
Malcolm Fridlund
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
M. Ammler-Von Eiff
S. Chaintreuil
Université Paris Diderot
C. Damiani
Laboratoire d'Astrophysique de Marseille
M. Deleuil
Laboratoire d'Astrophysique de Marseille
S. Ferraz-Mello
Universidade de Sao Paulo (USP)
A. Ferrigno
Université Paris Diderot
D. Gandolfi
Universität Heidelberg
T. Guillot
Université Nice Sophia Antipolis (UNS)
E. W. Guenther
Institut fur Weltraumforschung
A. Hatzes
G. Hebrard
Université Pierre et Marie Curie (UPMC)
P. Klagyivik
Instituto de Astrofísica de Canarias
Universidad de la Laguna
H. Parviainen
University of Oxford
T. Pasternacki
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
M. Patzold
Universität zu Köln
D. Sebastian
M. T. dos Santos
Universidade de Sao Paulo (USP)
G. Wuchterl
S. Aigrain
University of Oxford
R. Alonso
Universidad de 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
Université Paris Diderot
A. Baglin
Université Paris Diderot
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-Gesellschaft
C. Chaffey
Torrance High School
H. J. Deeg
Instituto de Astrofísica de Canarias
Universidad de la Laguna
R. F. Diaz
Université de Genève
R. Dvorak
Universität Wien
A. Erikson
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
S. Grziwa
Universität zu Köln
J. Korth
Universität zu Köln
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
Georg-August-Universität Göttingen
M. Ollivier
Université Paris-Sud
E. Palle
Instituto de Astrofísica de Canarias
Universidad de la Laguna
H. Rauer
Deutsches Zentrums für Luft- und Raumfahrt (DLR)
Technische Universität Berlin
D. Rouan
Université Paris Diderot
B. Samuel
Université Paris Diderot
A. Santerne
Universidade do Porto
J. Schneider
Université Paris Diderot
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 579 A36Ämneskategorier
Fusion, plasma och rymdfysik
DOI
10.1051/0004-6361/201424501