The SOPHIE search for northern extrasolar planets

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