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 () 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 ∼ 50 M ⊕ 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. © ESO, 2017.
Documento: | Artículo |
Título: | A deeper view of the CoRoT-9 planetary system: A small non-zero eccentricity for CoRoT-9b likely generated by planet-planet scattering |
Autor: | Bonomo, A.S.; Hébrard, G.; Raymond, S.N.; Bouchy, F.; Lecavelier Des Etangs, A.; Bordé, P.; Aigrain, S.; Almenara, J.-M.; Alonso, R.; Cabrera, J.; Csizmadia, S.; Damiani, C.; Deeg, H.J.; Deleuil, M.; Díaz, R.F.; Erikson, A.; Fridlund, M.; Gandolfi, D.; Guenther, E.; Guillot, T.; Hatzes, A.; Izidoro, A.; Lovis, C.; Moutou, C.; Ollivier, M.; Pätzold, M.; Rauer, H.; Rouan, D.; Santerne, A.; Schneider, J. |
Filiación: | INAF-Osservatorio Astrofisico di Torino, via Osservatorio 20, Pino Torinese, 10025, Italy Institut d'Astrophysique de Paris, CNRS, Sorbonne Universités, 98 bis bd Arago, Paris, 75014, France Observatoire de Haute Provence, Université Aix-Marseille, CNRS, St. Michel l' Observatoire, 04870, France Laboratoire d'Astrophysique de Bordeaux, Université de Bordeaux, Allée Geoffroy Saint-Hilaire, Pessac, 33615, France Observatoire de l'Université de Genève, 51 chemin des Maillettes, Sauverny, 1290, Switzerland Department of Physics, Denys Wilkinson Building, Keble Road, Oxford, OX1 3RH, United Kingdom Instituto de Astrofisica de Canarias, La Laguna, Tenerife, 38205, Spain Universidad de La Laguna, Dept. de Astrofísica, La Laguna, Tenerife, 38200, Spain Institute of Planetary Research, German Aerospace Center, Rutherfordstrasse 2, Berlin, 12489, Germany Institut d'Astrophysique Spatiale, UMR 8617, CNRS - Université de Paris-Sud, Bât. 121, Orsay, 91405, France Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, Marseille, 13388, France Universidad de Buenos Aires, Facultad de Ciencias Exactas y Naturales, Buenos Aires, Argentina CONICET - Universidad de Buenos Aires, Instituto de Astronomía y Física del Espacio (IAFE), Buenos Aires, Argentina Leiden Observatory, University of Leiden, PO Box 9513, Leiden, 2300 RA, Netherlands Department of Earth and Space Sciences, Chalmers University of Technology, Onsala Space Observatory, Onsala, 439 92, Sweden Dipartimento di Fisica, Università di Torino, via P. Giuria 1, Torino, 10125, Italy Thüringer Landessternwarte, Sternwarte 5, Tautenburg 5, Tautenburg, 07778, Germany Observatoire de la Côte d'Azur, Laboratoire Cassiopée, BP 4229, Nice Cedex 4, 06304, France UNESP, Univ. Estadual Paulista, Grupo de Dinâmica Orbital and Planetologia, Guaratinguetá, CEP 12, São Paulo, 516-410, Brazil CNRS, CFHT Corporation, 65-1238 Mamalahoa Hwy, Kamuela, HI 96743, United States LESIA, Obs. de Paris, Place J. Janssen, Meudon Cedex, 92195, France Rheinisches Institut für Umweltforschung, Universität zu Köln, Aachener Strasse 209, Köln, 50931, Germany Center for Astronomy and Astrophysics, TU Berlin, Hardenbergstr. 36, Berlin, 10623, Germany LUTH, Observatoire de Paris, Université Paris Diderot, 5 place Jules Janssen, Meudon, 92195, France |
Palabras clave: | Planetary systems; Stars: Individual: CoRoT-9; Techniques: Photometric; Techniques: Radial velocities; Planets; Giant planets; Planetary system; Protoplanetary disks; Radial velocity; Stars: individual; Techniques: photometric; Techniques: radial velocities; Zero eccentricity; Orbits |
Año: | 2017 |
Volumen: | 603 |
DOI: | http://dx.doi.org/10.1051/0004-6361/201730624 |
Título revista: | Astronomy and Astrophysics |
Título revista abreviado: | Astron. Astrophys. |
ISSN: | 00046361 |
CODEN: | AAEJA |
Registro: | https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v603_n_p_Bonomo |