SOPHIE velocimetry of Kepler transit candidates: a long-period, eccentric transiting brown dwarf to an evolved Sun

We report the discovery of a long-period brown-dwarf transiting companion of the solar-type star KOI-415. The transits were detected by the Kepler space telescope. We conducted Doppler measurements using the SOPHIE spectrograph at the Observatoire de Haute-Provence. The photometric and spectroscopic signals allow us to characterize a 62.14+-2.69 Mjup, brown-dwarf companion of an evolved 0.94+-0.06 Msun star in a highly eccentric orbit of P = 166.78805+-0.00022 days and e = 0.698+-0.002. The radius of KOI-415 b is 0.79 (-0.07,+0.12) Rjup, a value that is compatible with theoretical predictions for a 10 Gyr, low-metallicity and non-irradiated object.

SOPHIE velocimetry of Kepler transit candidates IX. KOI-415 b: a long-period, eccentric transiting brown dwarf to an evolved Sun

C. Moutou, A.S. Bonomo, G. Bruno, G. Montagnier, F. Bouchy, J.M. Almenara, S.C.C. Barros, M. Deleuil, R.F. Diaz, G. Hebrard, A. Santerne (Submitted on 4 Sep 2013)

Comments: accepted in A&A Letters

Subjects: Earth and Planetary Astrophysics (astro-ph.EP)

Cite as: arXiv:1309.0905 [astro-ph.EP]

(or arXiv:1309.0905v1 [astro-ph.EP] for this version) Submission history From: Claire Moutou [v1] Wed, 4 Sep 2013 03:25:06 GMT (46kb)

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