The SOPHIE search for northern extrasolar planets

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

ASTRONOMY AND ASTROPHYSICS

EDP SCIENCES S A

Lugar: Paris; Año: 2019 vol. 625

0004-6361

We present the detection of a warm Neptune orbiting the M dwarf Gl 378, using radial velocity measurements obtained with the SOPHIE spectrograph at the Observatoire de Haute-Provence. The star was observed in the context of the SOPHIE exoplanet consortium´s sub-programme dedicated to finding planets around M dwarfs. Gl 378 is an M1 star, of solar metallicity, at a distance of 14.96 pc. The single planet detected, Gl 378 b, has a minimum mass of 13.02 MEarth and an orbital period of 3.82 days, which place it at the lower boundary of the hot Neptune desert. As one of only a few such planets around M dwarfs, Gl 378 b provides important clues to the evolutionary history of these close-in planets. In particular, the eccentricity of 0.1 may point to a high-eccentricity migration. The planet may also have lost part of its envelope due to irradiation.