Planetary systems; Stars: Individual: G1 378; Stars: Late-type; Techniques: Radial velocities; Evolutionary history; Lower boundary; Orbital periods; Planetary system; Radial velocity measurements; Stars: individual; Stars:late type; Techniques: radial velocities; Astronomy and Astrophysics; Space and Planetary Science; astro-ph.EP
Abstract :
[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Hobson, M.J.; CNES, LAM, Aix-Marseille Université, Marseille, France
Delfosse, X.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France
Astudillo-Defru, N.; Departamento de Astronomía, Universidad de Concepción, Concepción, Chile
Boisse, I.; CNES, LAM, Aix-Marseille Université, Marseille, France
Díaz, R.F.; Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina ; Instituto de Astronomía y Física Del Espacio (IAFE), CONICET - Universidad de Buenos Aires, Buenos Aires, Argentina
Bouchy, F.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Bonfils, X.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France
Forveille, T.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France
Arnold, L.; Observatoire de Haute-Provence, CNRS, Aix-Marseille Université, Saint-Michel-l'Observatoire, France
Borgniet, S.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France
Bourrier, V.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Brugger, B.; CNES, LAM, Aix-Marseille Université, Marseille, France
Cabrera Salazar, N.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France
Courcol, B.; CNES, LAM, Aix-Marseille Université, Marseille, France
Dalal, S.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie, Paris, France
Deleuil, M.; CNES, LAM, Aix-Marseille Université, Marseille, France
Demangeon, O.; Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, CAUP, Porto, Portugal
Dumusque, X.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Hara, N.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland ; ASD/IMCCE, CNRS-UMR8028, Observatoire de Paris, Paris, France
Hébrard, G.; Observatoire de Haute-Provence, CNRS, Aix-Marseille Université, Saint-Michel-l'Observatoire, France ; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie, Paris, France
Kiefer, F.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie, Paris, France
Lopez, T.; CNES, LAM, Aix-Marseille Université, Marseille, France
Mignon, L.; CNRS, IPAG, Université Grenoble Alpes, Grenoble, France
Montagnier, G.; Observatoire de Haute-Provence, CNRS, Aix-Marseille Université, Saint-Michel-l'Observatoire, France ; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie, Paris, France
Mousis, O.; CNES, LAM, Aix-Marseille Université, Marseille, France
Moutou, C.; CNES, LAM, Aix-Marseille Université, Marseille, France ; Canada-France-Hawaii Telescope Corporation, Kamuela, United States
Pepe, F.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Rey, J.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Santerne, A.; CNES, LAM, Aix-Marseille Université, Marseille, France
Santos, N.C.; Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, CAUP, Porto, Portugal ; Departamento de Física e Astronomia, Faculdade de Ciências, Universidade Do Porto, Porto, Portugal
Stalport, Manu ; Université de Liège - ULiège > Unités de recherche interfacultaires > Space sciences, Technologies and Astrophysics Research (STAR) ; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Ségransan, D.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Udry, S.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Wilson, P.A.; Institut d'Astrophysique de Paris, UMR7095 CNRS, Université Pierre and Marie Curie, Paris, France ; Department of Physics, University of Warwick, Coventry, United Kingdom ; Centre for Exoplanets and Habitability, University of Warwick, Coventry, United Kingdom
cA klwn edgeme. We warmly thank the OHP staff for their support on the observations. We thank the anonymous referee for the careful reading and valuable comments which helped to improve the manuscript. This work was supported by the Programme National de Plan\u00E9tologie (PNP) of CNRS/INSU, co-funded by CNE. X.De., X.B., I.B., and T.F. received funding from the French Programme National de Physique Stellaire (PNPS) and the Programme National de Plan\u00E9tologie (PNP) of CNRS (INSU). X.B. acknowledges funding from the European Research Council under the ERC Grant Agreement n. 337591-ExTrA. This work has been supported by a grant from Labex OSUG@2020 (Investisse-ments d\u2019avenir \u2013 ANR10 LABX56). This work is also supported by the French National Research Agency in the framework of the Investissements d\u2019Avenir program (ANR-15-IDEX-02), through the funding of the \u201COrigin of Life\u201D project of the Univ. Grenoble-Alpes. V.B. acknowledges support from the Swiss National Science Foundation (SNSF) in the frame of the National Centre for Competence in Research PlanetS, and has received funding from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme (project Four Aces; grant agreement No 724427). This work was supported by FCT \u2013 Funda\u00E7\u00E3o para a Ci\u00EAncia e a Tecnologia through national funds and by FEDER through COMPETE2020 \u2013 Programa Opera-cional Competitividade e Internacionaliza\u00E7\u00E3o by grants UID/FIS/04434/2013 & POCI-01-0145-FEDER-007672; PTDC/FIS-AST/28953/2017 & POCI-01-0145-FEDER-028953; and PTDC/FIS-AST/32113/2017 & POCI-01-0145-FEDER-032113. N.A-D. acknowledges support from FONDECYT #3180063. N.H.acknowledges the financial support of the National Centre for Competence in Research PlanetS of the Swiss National Science Foundation (SNSF). X.Du. is grateful to the Branco Weiss Fellowship\u2013Society in Science for continuous support. This publication makes use of the Data & Analysis Center for Exoplanets (DACE), which is a facility based at the University of Geneva (CH) dedicated to extrasolar planets data visualisation, exchange, and analysis. DACE is a platform of the Swiss National Centre of Competence in Research (NCCR) PlanetS, federating the Swiss expertise in Exoplanet research. The DACE platform is available at https://dace.unige.ch.
Commentary :
10 pages, 8 figures, accepted for publication in A&A
