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 Astrofisico 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 Astrofisico 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-

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/201730624

More information

Latest update

4/4/2019 1