SOPHIE velocimetry of Kepler transit candidates. XIX. The transiting temperate giant planet KOI-3680b

G. Hebrard; A. S. Bonomo; R. F. Diaz; A. Santerne; N. C. Santos; J. -M. Almenara; S. C. C. Barros; I. Boisse; F. Bouchy; G. Bruno; B. Courcol; M. Deleuil; O. Demangeon; T. Guillot; G. Montagnier; C. Moutou; J. Rey; P. A. Wilson

doi:10.1051/0004-6361/201834333

arXiv · 1811.09580

SOPHIE velocimetry of Kepler transit candidates. XIX. The transiting temperate giant planet KOI-3680b

G. Hebrard·A. S. Bonomo·R. F. Diaz·A. Santerne·N. C. Santos·J. -M. Almenara·S. C. C. Barros·I. Boisse·F. Bouchy·G. Bruno·B. Courcol·M. Deleuil·O. Demangeon·T. Guillot·G. Montagnier·C. Moutou·J. Rey·P. A. Wilson

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Abstract

Whereas thousands of transiting giant exoplanets are known today, only a few are well characterized with long orbital periods. Here we present KOI-3680b, a new planet in this category. First identified by the Kepler team as a promising candidate from the photometry of the Kepler spacecraft, we establish here its planetary nature from the radial velocity follow-up secured over two years with the SOPHIE spectrograph at Observatoire de Haute-Provence, France. The combined analysis of the whole dataset allows us to fully characterize this new planetary system. KOI-3680b has an orbital period of 141.2417 +/- 0.0001 days, a mass of 1.93 +/- 0.20 M_Jup, and a radius of 0.99 +/- 0.07 R_Jup. It exhibits a highly eccentric orbit (e = 0.50 +/- 0.03) around an early G dwarf. KOI-3680b is the transiting giant planet with the longest period characterized so far around a single star; it offers opportunities to extend studies which were mainly devoted to exoplanets close to their host stars, and to compare both exoplanet populations.

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G. Hebrard, A. S. Bonomo, R. F. Diaz, A. Santerne, N. C. Santos, J. -M. Almenara, S. C. C. Barros, I. Boisse, F. Bouchy, G. Bruno, B. Courcol, M. Deleuil, O. Demangeon, T. Guillot, G. Montagnier, C. Moutou, J. Rey, P. A. Wilson. 2018-11-23. SOPHIE velocimetry of Kepler transit candidates. XIX. The transiting temperate giant planet KOI-3680b. https://doi.org/10.1051/0004-6361%2F201834333

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