Rey, J.; Bouchy, F.; Stalport, M.; Deleuil, M.; Hébrard, G.; Almenara, J. M.; Alonso, R.; Barros, S. C. C.; Bonomo, A. S.; Cazalet, G.; Delisle, J. B.; Díaz, R. F.; Fridlund, M.; Guenther, E. W.; Guillot, T.; Montagnier, G.; Moutou, C.; Lovis, C.; Queloz, D.; Santerne, A.; Udry, S.
Bibliographical reference
Astronomy and Astrophysics, Volume 619, id.A115, 7 pp.
Description
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.
Based on observations collected with the SOPHIE spectrograph on the
1.93-m telescope at Observatoire de Haute-Provence (CNRS), France, and
with the HARPS spectrograph (Prog. 188.C-0779) at the 3.6-m telescope at
La Silla Observatory.
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