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: photometric

Planetary systems

Techniques: spectroscopic

Techniques: radial velocities

Författare

J. Cabrera

Deutsches Zentrum fur Luft- Und Raumfahrt

S. Csizmadia

Deutsches Zentrum fur Luft- Und Raumfahrt

G. Montagnier

Universite Pierre et Marie Curie

Malcolm Fridlund

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

M. Ammler-Von Eiff

S. Chaintreuil

Universite Paris 7- Denis 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

Universite Paris 7- Denis Diderot

D. Gandolfi

Universität Heidelberg

T. Guillot

Université Nice Sophia Antipolis (UNS)

E. W. Guenther

Institut fur Weltraumforschung

A. Hatzes

G. Hebrard

Universite Pierre et Marie Curie

P. Klagyivik

Universidad de la Laguna

Instituto Astrofisico de Canarias

H. Parviainen

University of Oxford

T. Pasternacki

Deutsches Zentrum fur Luft- Und Raumfahrt

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 Astrofisico de Canarias

J. M. Almenara

Laboratoire d'Astrophysique de Marseille

J.D. Armstrong

University of Hawaii System

Las Cumbres Observatory Global Telescope Network, Inc

M. Auvergne

Universite Paris 7- Denis Diderot

A. Baglin

Universite Paris 7- Denis Diderot

P. Barge

Laboratoire d'Astrophysique de Marseille

S.C.C. Barros

Laboratoire d'Astrophysique de Marseille

A. S. Bonomo

Istituto Nazionale Di Astrofisica, Rome

P. Bordé

Laboratoire d'Astrophysique de Bordeaux

F. Bouchy

Laboratoire d'Astrophysique de Marseille

S. Carpano

Max Planck-institutet

C. Chaffey

Torrance High School

H. J. Deeg

Instituto Astrofisico de Canarias

Universidad de la Laguna

R. F. Diaz

Universite de Geneve

R. Dvorak

Universität Wien

A. Erikson

Deutsches Zentrum fur Luft- Und Raumfahrt

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

CFHT Corporation

Laboratoire d'Astrophysique de Marseille

A. Ofir

Georg-August-Universität Göttingen

M. Ollivier

Universite Paris-Sud XI

E. Palle

Instituto Astrofisico de Canarias

Universidad de la Laguna

H. Rauer

Technische Universität Berlin

Deutsches Zentrum fur Luft- Und Raumfahrt

D. Rouan

Universite Paris 7- Denis Diderot

B. Samuel

Universite Paris 7- Denis Diderot

A. Santerne

Universidade do Porto

J. Schneider

Universite Paris 7- Denis Diderot

Astronomy and Astrophysics

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

Vol. 579 A36

Ämneskategorier

Fusion, plasma och rymdfysik

DOI

10.1051/0004-6361/201424501