Hébrard, G.G.HébrardBONOMO, ALDO STEFANOALDO STEFANOBONOMODíaz, R. F.R. F.DíazSanterne, A.A.SanterneSantos, N. C.N. C.SantosAlmenara, J. -M.J. -M.AlmenaraBarros, S. C. C.S. C. C.BarrosBoisse, I.I.BoisseBouchy, F.F.BouchyBRUNO, GIOVANNIGIOVANNIBRUNOCourcol, B.B.CourcolDeleuil, M.M.DeleuilDemangeon, O.O.DemangeonGuillot, T.T.GuillotMontagnier, G.G.MontagnierMoutou, C.C.MoutouRey, J.J.ReyWilson, P. A.P. A.Wilson2020-12-042020-12-0420190004-6361http://hdl.handle.net/20.500.12386/28695Whereas 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 M<SUB>Jup</SUB>, and a radius of 0.99 ± 0.07 R<SUB>Jup</SUB>. 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.STAMPAenArticle10.1051/0004-6361/2018343332-s2.0-85062869873000460725400001https://www.aanda.org/articles/aa/full_html/2019/03/aa34333-18/aa34333-18.html2019A&A...623A.104HFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation::PE9_6 Stars and stellar systems