Transiting exoplanets from the CoRoT space mission: XV. CoRoT-15b: A brown-dwarf transiting companion

F. Bouchy*, M. Deleuil, T. Guillot, S. Aigrain, L. Carone, W. D. Cochran, J. M. Almenara, R. Alonso, M. Auvergne, A. Baglin, P. Barge, A. S. Bonomo, P. Bordé, Sz Csizmadia, K. De Bondt, H. J. Deeg, R. F. Díaz, R. Dvorak, M. Endl, A. EriksonS. Ferraz-Mello, M. Fridlund, D. Gandolfi, J. C. Gazzano, N. Gibson, M. Gillon, E. Guenther, A. Hatzes, M. Havel, G. Hébrard, L. Jorda, A. Léger, C. Lovis, A. Llebaria, H. Lammer, P. J. MacQueen, T. Mazeh, C. Moutou, A. Ofir, M. Ollivier, H. Parviainen, M. Pätzold, D. Queloz, H. Rauer, D. Rouan, A. Santerne, J. Schneider, B. Tingley, G. Wuchterl

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We report the discovery by the CoRoT space mission of a transiting brown dwarf orbiting a F7V star with an orbital period of 3.06 days. CoRoT-15b has a radius of 1.12+0.30-0.15 RJup and a mass of 63.3 ± 4.1 MJup, and is thus the second transiting companion lying in the theoretical mass domain of brown dwarfs. CoRoT-15b is either very young or inflated compared to standard evolution models, a situation similar to that of M-dwarf stars orbiting close to solar-typestars. Spectroscopic constraints and an analysis of the lightcurve imply a spin period in the range 2.9-3.1 days for the central star, which is compatible with a double-synchronisation of the system.

Original languageEnglish
Article numberA68
JournalAstronomy and Astrophysics
Volume525
Issue number19
StatePublished - Jan 2011

Keywords

  • Brown dwarfs
  • Planetary systems
  • Stars: low-mass
  • Techniques: photometric
  • Techniques: radial velocities
  • Techniques: spectroscopic

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