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

M. Ollivier*, M. Gillon, A. Santerne, G. Wuchterl, M. Havel, H. Bruntt, P. Bordé, T. Pasternacki, M. Endl, D. Gandolfi, S. Aigrain, J. M. Almenara, R. Alonso, M. Auvergne, A. Baglin, P. Barge, A. S. Bonomo, F. Bouchy, J. Cabrera, L. CaroneS. Carpano, C. Cavarroc, W. D. Cochran, Sz Csizmadia, H. J. Deeg, M. Deleuil, R. F. Diaz, R. Dvorak, A. Erikson, S. Ferraz-Mello, M. Fridlund, J. C. Gazzano, S. Grziwa, E. Guenther, T. Guillot, P. Guterman, A. Hatzes, G. Hébrard, H. Lammer, A. Léger, C. Lovis, P. J. MacQueen, M. Mayor, T. Mazeh, C. Moutou, A. Ofir, M. Pätzold, D. Queloz, H. Rauer, D. Rouan, B. Samuel, J. Schneider, M. Tadeu Dos Santos, L. Tal-Or, B. Tingley, J. Weingrill

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

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.

Original languageEnglish
Article numberA149
JournalAstronomy and Astrophysics
Volume541
DOIs
StatePublished - 2012

Funding

FundersFunder number
Not addedST/G002266/1
National Aeronautics and Space AdministrationNNX09AB30G
W. M. Keck Foundation
Science and Technology Facilities CouncilST/G002266/2
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung140444
Deutsches Zentrum für Luft- und Raumfahrt50OW0204, 50QP07011, 50O0603
Israel Science Foundation655/07
Ministerio de Ciencia e Innovación
Universität zu Köln

    Keywords

    • Planetary systems
    • Stars: fundamental parameters
    • Techniques: photometric
    • Techniques: radial velocities
    • Techniques: spectroscopic

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