The SOPHIE search for northern extrasolar planets: XIII. Two planets around M-dwarfs Gl617A and Gl96

HOBSON, M.J.; DÍAZ, R.F.; DELFOSSE, X.; ASTUDILLO-DEFRU, N.; BOISSE, I.; BOUCHY, F.; BONFILS, X.; FORVEILLE, T.; HARA, N.; ARNOLD, L.; BORGNIET, S.; BOURRIER, V.; BRUGGER, B.; CABRERA, N.; COURCOL, B.; DALAL, S.; DELEUIL, M.; DEMANGEON, O.; DUMUSQUE, X.; EHRENREICH, D.; HÉBRARD, G.; KIEFER, F.; LOPEZ, T.; MIGNON, L.; MONTAGNIER, G.; MOUSIS, O.; MOUTOU, C.; PEPE, F.; REY, J.; SANTERNE, A.; SANTOS, N.; STALPORT, M.; SÉGRANSAN, D.; UDRY, S.; WILSON, P.A.

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Año: 2018 vol. 618

0004-6361

We report the detection of two exoplanets and a further tentative candidate around the M-dwarf stars Gl96 and Gl617A, based on radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. Both stars were observed in the context of the SOPHIE exoplanet consortium´s dedicated M-dwarf subprogramme, which aims to detect exoplanets around nearby M-dwarf stars through a systematic survey. For Gl96 we present the discovery of a new exoplanet at 73.9 d with a minimum mass of 19.66 earth masses. Gl96 b has an eccentricity of 0.44, placing it among the most eccentric planets orbiting M stars. For Gl617A we independently confirm a recently reported exoplanet at 86.7 d with a minimum mass of 31.29 earth masses. Both Gl96 b and Gl617A b are potentially within the habitable zone, although the high eccentricity of Gl96 b may take it too close to the star at periapsis.