Transiting exoplanets from the CoRoT space mission XXII. CoRoT-16b: a hot Jupiter with a hint of eccentricity around a faint solar-like star

Author(s)

Marc Ollivier, Michel Gillon, Alexandre Santerne, Rudolf Dvorak

Abstract

Aims. We report the discovery of CoRoT-16b, a low density hot jupiter that orbits a faint G5V star (mV = 15.63) in 5.3523 +/- 0.0002 days with slight eccentricity. A fit of the data with no a priori assumptions on the orbit leads to an eccentricity of 0.33 +/- 0.1. We discuss this value and also derive the mass and radius of the planet.

 

Methods. We analyse the photometric transit curve of CoRoT-16 given by the CoRoT satellite, and radial velocity data from the HARPS and HIRES spectrometers. A combined analysis using a Markov chain Monte Carlo algorithm is used to get the system parameters.

 

Results. CoRoT-16b is a 0.535 -0.083/+0.085 M-J, 1.17 -0.14/+0.16 R-J hot Jupiter with a density of 0.44 -0.14/+0.21 g cm(-3). Despite its short orbital distance (0.0618 +/- 0.0015 AU) and the age of the parent star (6.73 +/- 2.8 Gyr), the planet orbit exhibits significantly non-zero eccentricity. This is very uncommon for this type of objects as tidal effects tend to circularise the orbit. This value is discussed taking into account the characteristics of the star and the observation accuracy.

Organisation(s)

Department of Astrophysics

External organisation(s)

Institute d'Astrophysique Spatiale - IAS, Université de Liège, Université de Provence Aix-Marseille I

Journal

Astronomy & Astrophysics

Volume

541

ISSN

0004-6361

DOI

https://doi.org/10.1051/0004-6361/201117460

Publication date

2012

Peer reviewed

Yes

Austrian Fields of Science 2012

103004 Astrophysics

Portal url

https://ucrisportal.univie.ac.at/en/publications/transiting-exoplanets-from-the-corot-space-mission-xxii-corot16b-a-hot-jupiter-with-a-hint-of-eccentricity-around-a-faint-solarlike-star(e4b6fa38-0869-4c37-9c1e-10c332d869ca).html