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Planets and Stellar Activity: Hide and Seek in the CoRoT-7 system

Published online by Cambridge University Press:  06 January 2014

R. D. Haywood ,
A. C. Cameron ,
D. Queloz ,
S. C. C. Barros ,
M. Deleuil ,
R. Fares ,
M. Gillon ,
A. Hatzes ,
A. F. Lanza  and
C. Lovis
...Show all authors
R. D. Haywood
Affiliation:
School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK email: [email protected]
A. C. Cameron
Affiliation:
School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK email: [email protected]
D. Queloz
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
S. C. C. Barros
Affiliation:
Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
M. Deleuil
Affiliation:
Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
R. Fares
Affiliation:
School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK email: [email protected]
M. Gillon
Affiliation:
Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 août 17, Bat. B5C, 4000 Liège, Belgium
A. Hatzes
Affiliation:
Thüringer Landessternwarte, D-07778 Tautenburg, Germany
A. F. Lanza
Affiliation:
INAF-Osservatorio Astrofisico di Catania, via S. Sofia, 78 - 95123 Catania. Italy
C. Lovis
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
C. Moutou
Affiliation:
Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
F. Pepe
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
D. Pollacco
Affiliation:
Department of Physics, University of Warwick, Coventry CV4 7AL, UK
A. Santerne
Affiliation:
Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France Centro de Astrofísica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
D. Ségransan
Affiliation:
Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Y. Unruh
Affiliation:
Astrophysics Group, Blackett Laboratory, Imperial College London, London SW7 2AZ, UK
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Abstract

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Since the discovery of the transiting Super-Earth CoRoT-7b, several investigations have been made of the number and precise masses of planets present in the system, but they all yield different results, owing to the star's high level of activity. Radial velocity (RV) variations induced by stellar activity therefore need to be modelled and removed to allow a reliable detection of all planets in the system. We re-observed CoRoT-7 in January 2012 with both HARPS and the CoRoT satellite, so that we now have the benefit of simultaneous RV and photometric data. We fitted the off-transit variations in the CoRoT lightcurve using a harmonic decomposition similar to that implemented in Queloz et al. (2009). This fit was then used to model the stellar RV contribution, according to the methods described by Aigrain et al. (2011). This model was incorporated into a Monte Carlo Markov Chain in order to make a precise determination of the orbits of CoRoT-7b and CoRoT-7c. We also assess the evidence for the presence of one or two additional planetary companions.

Keywords

planetary systemsstellar activityRV method
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S299: Exploring the Formation and Evolution of Planetary Systems , June 2013 , pp. 237 - 240
Copyright
Copyright © International Astronomical Union 2013 

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