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

G. Hébrard, A. S. Bonomo, R. F. Díaz, 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

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 2 yr 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 MJup, and a radius of 0.99 ± 0.07 RJup. 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.

Keywords
planetary systems; techniques: radial velocities; techniques: photometric; techniques: spectroscopic; stars: individual: KOI-3680

Astronomy and Astrophysics
Volume 623, Article Number A104, Number of pages 10
2019 March

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Instituto de Astrofísica e Ciências do Espaço Universidade do Porto Faculdade de Ciências da Universidade de Lisboa
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia