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 Astrofisico 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 Astrofisico de Canarias

J. M. Almenara

Laboratoire d'Astrophysique de Marseille

J.D. Armstrong

Las Cumbres Observatory Global Telescope Network, Inc

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 Institute

C. Chaffey

Torrance High School

H. J. Deeg

Instituto Astrofisico 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 Astrofisico 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

Universidade do Porto

J. Schneider

Paris Diderot University

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 579 A36

Subject Categories

Fusion, Plasma and Space Physics

DOI

10.1051/0004-6361/201424501

More information

Latest update

4/4/2019 1