SOPHIE velocimetry of Kepler transit candidates. XIX. The transiting temperate giant planet KOI-3680b
Journal
Date Issued
2019
Author(s)
Hébrard, G.
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Díaz, R. F.
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Santerne, A.
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Santos, N. C.
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Almenara, J. -M.
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Barros, S. C. C.
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Boisse, I.
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Bouchy, F.
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•
Courcol, B.
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Deleuil, M.
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Demangeon, O.
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Guillot, T.
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Montagnier, G.
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Moutou, C.
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Rey, J.
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Wilson, P. A.
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.
Volume
623
Start page
A104
Issn Identifier
0004-6361
Ads BibCode
2019A&A...623A.104H
Rights
open.access
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