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. DÍAZ; G. HÉBRARD; A. SANTERNE

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2013 vol. 558 p. 1 - 5

0004-6361

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 M⊙   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+0.12RJup , a value that is compatible with theoretical predictions for a 10 Gyr, low-metallicity and non-irradiated object.