A deeper view of the CoRoT-9 planetary system A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering
Journal article, 2017
CoRoT-9b is one of the rare long-period (P = 95 : 3 days) transiting giant planets with a measured mass known to date. We present a new analysis of the CoRoT-9 system based on five years of radial-velocity (RV) monitoring with HARPS and three new space-based transits observed with CoRoT and Spitzer. Combining our new data with already published measurements we redetermine the CoRoT-9 system parameters and find good agreement with the published values. We uncover a higher significance for the small but non-zero eccentricity of CoRoT-9b (e = 0 : 133(-0.037)(+0.042)) and find no evidence for additional planets in the system. We use simulations of planet-planet scattering to show that the eccentricity of CoRoT-9b may have been generated by an instability in which a similar to 50 M-circle plus planet was ejected from the system. This scattering would not have produced a spin-orbit misalignment, so we predict that the CoRoT-9b orbit should lie within a few degrees of the initial plane of the protoplanetary disk. As a consequence, any significant stellar obliquity would indicate that the disk was primordially tilted.
techniques: photometric
techniques: radial velocities
Warm
Terrestrial Planets
Sophie Velocimetry
Jupiters
Dynamical Instabilities
Hot Jupiters
Spin-Orbit Misalignments
Earth-Like Planets
planetary systems
Gas Giant Planets
Harps-N
stars: individual: CoRoT-9
Super-Earths
Author
A. S. Bonomo
Istituto nazionale di astrofisica (INAF)
G. Hebrard
Sorbonne University
Observatoire de Haute-Provence
S. N. Raymond
Laboratoire d'Astrophysique de Bordeaux
F. Bouchy
University of Geneva
A. L. des Etangs
Sorbonne University
P. Borde
Laboratoire d'Astrophysique de Bordeaux
S. Aigrain
University of Oxford
J. M. Almenara
University of Geneva
R. Alonso
Instituto de Astrofísica de Canarias
University of La Laguna
J. Cabrera
German Aerospace Center (DLR)
S. Csizmadia
German Aerospace Center (DLR)
C. Damiani
University of Paris-Sud
H. J. Deeg
University of La Laguna
Instituto de Astrofísica de Canarias
M. Deleuil
Laboratoire d'Astrophysique de Marseille
R. F. Diaz
Instituto de Astronomia y Fisica del Espacio
Universidad de Buenos Aires
A. Erikson
German Aerospace Center (DLR)
Malcolm Fridlund
Chalmers, Earth and Space Sciences, Onsala Space Observatory
D. Gandolfi
University of Turin
E. W. Guenther
Thüringer Landessternwarte Tautenburg
T. Guillot
Observatoire de la Cote d'Azur
A. Hatzes
Thüringer Landessternwarte Tautenburg
A. Izidoro
Laboratoire d'Astrophysique de Bordeaux
São Paulo State University (UNESP)
C. Lovis
University of Geneva
C. Moutou
Canada France Hawaii Telescope Corporation
Laboratoire d'Astrophysique de Marseille
M. Ollivier
LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
University of Paris-Sud
M. Patzold
University of Cologne
H. Rauer
German Aerospace Center (DLR)
Technische Universität Berlin
D. Rouan
LESIA - Laboratoire d'Etudes Spatiales et d'Instrumentation en Astrophysique
A. Santerne
Laboratoire d'Astrophysique de Marseille
J. Schneider
Paris Diderot University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 603 A43- A43Subject Categories
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201730624