The SOPHIE search for northern extrasolar planets. XIII. Two planets around M-dwarfs Gl617A and Gl96
Bouchy, F.; Deleuil, M.; Moutou, C.; Montagnier, G.; Ségransan, D.; Bonfils, X.; Ehrenreich, D.; Udry, S.; Pepe, F.; Bourrier, V.; Mousis, O.; Kiefer, F.; Hébrard, G.; Boisse, I.; Dalal, S.; Delfosse, X.; Díaz, R. F.; Forveille, T.; Dumusque, X.; Demangeon, O.; Arnold, L.; Lopez, T.; Astudillo-Defru, N.; Brugger, B.; Hobson, M. J.; Mignon, L.; Rey, J.; Santerne, A.; Stalport, M.; Wilson, P. A.; Santos, N.; Hara, N.; Borgniet, S.; Courcol, B.; Cabrera, N.
France, Argentina, Chile, Switzerland, Portugal, United States, Netherlands
Abstract
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.
Based on observations collected with the SOPHIE spectrograph on the 1.93 m telescope at the Observatoire de Haute-Provence (CNRS), France, by the SOPHIE Consortium. Full Tables A.1 and A.2 (RV tables) are only available at the CDS via anonymous ftp to http://cdsarc.u-strasbg.fr (http://130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/618/A103