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

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

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.