The SOPHIE search for northern extrasolar planets XV: A warm Neptune around the M dwarf Gl 378

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 pl...

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Detalhes bibliográficos
Autores: Hobson, M. J., Delfosse, X., Astudillo Defru, N., Boisse, I., Diaz, Rodrigo Fernando, 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.
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:Argentina
Recursos:Consejo Nacional de Investigaciones Científicas y Técnicas
Repositorio:CONICET Digital (CONICET)
Idioma:inglés
OAI Identifier:oai:ri.conicet.gov.ar:11336/213421
Acesso em linha:http://hdl.handle.net/11336/213421
Access Level:acceso abierto
Palavra-chave:PLANETARY SYSTEMS
STARS: INDIVIDUAL: G1 378
STARS: LATE-TYPE
TECHNIQUES: RADIAL VELOCITIES
https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
Descrição
Resumo: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.

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