Volume 623, March 2019
|Number of page(s)||10|
|Section||Planets and planetary systems|
|Published online||11 March 2019|
SOPHIE velocimetry of Kepler transit candidates
XIX. The transiting temperate giant planet KOI-3680b
Institut d’Astrophysique de Paris, UMR7095 CNRS, Université Pierre & Marie Curie,
98bis Boulevard Arago,
2 Observatoire de Haute-Provence, CNRS, Université d’Aix-Marseille, 04870 Saint-Michel-l’Observatoire, France
3 INAF, Osservatorio Astrofisico di Torino, Via Osservatorio 20, 10025, Pino Torinese, Italy
4 CONICET, Instituto de Astronomía y Física del Espacio (IAFE), Universidad de Buenos Aires, Buenos Aires, Argentina
5 CNRS, CNES, Laboratoire d’Astrophysique de Marseille, Aix Marseille Université, 13388 Marseille, France
6 Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal
7 Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua Campo Alegre, 4169-007 Porto, Portugal
8 Université Grenoble Alpes, CNRS, IPAG, 38000 Grenoble, France
9 Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, 1290 Sauverny, Switzerland
10 INAF, Osservatorio Astrofisico di Catania, Via S. Sofia, 78, 95123 Catania, Italy
11 Université Côte d’Azur, OCA, Lagrange CNRS, 06304 Nice, France
12 Canada France Hawaii Telescope Corporation, Kamuela, HI 96743, USA
13 Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
14 Centre for Exoplanets and Habitability, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK
Accepted: 19 November 2018
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.
Key words: planetary systems / techniques: radial velocities / techniques: photometric / techniques: spectroscopic / stars: individual: KOI-3680
© ESO 2019
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