Brown dwarfs; Planetary systems; Planets and satellites: Dynamical evolution and stability; Stars: Individual: CoRoT-20; Stars: Low-mass; Techniques: Radial velocities; Planetary system; Planets and satellites: dynamical evolution and stabilities; Stars: individual; Stars: low mass; Techniques: radial velocities; Astronomy and Astrophysics; Space and Planetary Science
Abstract :
[en] We report the discovery of an additional substellar companion in the CoRoT-20 system based on six years of HARPS and SOPHIE radial velocity follow-up. CoRoT-20 c has a minimum mass of 17 ± 1 MJup and orbits the host star in 4.59 ± 0.05 yr, with an orbital eccentricity of 0.60 ± 0.03. This is the first identified system with an eccentric hot Jupiter and an eccentric massive companion. The discovery of the latter might be an indication of the migration mechanism of the hot Jupiter, via the Lidov-Kozai effect. We explore the parameter space to determine which configurations would trigger this type of interactions.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Rey, J.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Bouchy, F.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Stalport, Manu ; Université de Liège - ULiège > Département d'astrophysique, géophysique et océanographie (AGO) > Thermodynamique des phénomènes irréversibles ; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Deleuil, M.; Aix Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, France
Hébrard, G.; Institut d'Astrophysique de Paris, CNRS, Université Pierre and Marie Curie, Paris, France ; Observatoire de Haute Provence, CNRS, Institut Pytheás UMS, Saint-Michel-l'Observatoire, France
Almenara, J.M.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Alonso, R.; Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain ; Universidad de la Laguna, Departamento de Astrofísica, La Laguna, Tenerife, Spain
Barros, S.C.C.; Instituto de Astrofísica e Ciências Do Espaço, Universidade Do Porto, Porto, Portugal
Bonomo, A.S.; INAF-Osservatorio Astrofisico di Torino, Pino Torinese, Italy
Cazalet, G.; Aix Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, France
Delisle, J.B.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Diáz, R.F.; Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina ; CONICET, Universidad de Buenos Aires, Instituto de Astronomiá y Física Del Espacio, Buenos Aires, Argentina
Fridlund, M.; Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, Onsala, Sweden ; Leiden Observatory, University of Leiden, Leiden, Netherlands
Guenther, E.W.; Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain ; Thüringer Landessternwarte Tautenburg, Tautenburg, Germany
Guillot, T.; Université Côte d'Azur, OCA, CNRS, Nice, France
Montagnier, G.; Institut d'Astrophysique de Paris, CNRS, Université Pierre and Marie Curie, Paris, France ; Observatoire de Haute Provence, CNRS, Institut Pytheás UMS, Saint-Michel-l'Observatoire, France
Moutou, C.; CNRS, Canada-France-Hawaii Telescope Corporation, Kamuela, United States
Lovis, C.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
Queloz, D.; Astrophysics Group, Cavendish Laboratory, Cambridge, United Kingdom
Santerne, A.; Aix Marseille Université, CNRS, Laboratoire d'Astrophysique de Marseille, France
Udry, S.; Observatoire Astronomique de l'Université de Genève, Versoix, Switzerland
cA knolw edgemen. We gratefully acknowledge the Programme National de Planétologie (telescope time attribution and financial support) of CNRS/INSU and the Swiss National Science Foundation for their support. We warmly thank the OHP staff for their support on the 1.93 m telescope. This work has been carried out in the frame of the National Centre for Competence in Research “PlanetS” supported by the Swiss National Science Foundation (SNSF). J.R. acknowledges support from CONICYT-Becas Chile (Grant No. 72140583). S.C.C.B. acknowledges support from Fundaça¯o para a Ciência e a Tecnologia (FCT) through national funds and by FEDER through COMPETE2020 by these grants UID/FIS/04434/2013 & POCI-01-0145-FEDER-007672 and PTDC/FIS-AST/1526/2014 & POCI-01-0145-FEDER-016886; and also acknowledges support from FCT through Investigador FCT contracts IF/01312/2014/CP1215/CT0004. Finally, we thank the referee for their thorough review and highly appreciate the comments and suggestions, which contributed to improving this publication.
