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Disentangling planetary orbits from stellar activity in radial-velocity surveys

Published online by Cambridge University Press:  14 January 2014

R. D. Haywood ,
A. Collier 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
A. Collier Cameron
Affiliation:
School of Physics and Astronomy, University of St. Andrews, St Andrews KY16 9SS, UK
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
M. Gillon
Affiliation:
Institut d'Astrophysique et de Géophysique, Universite 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
*
e-mail: rdh4@st-andrews.ac.uk
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Abstract

The majority of extra-solar planets have been discovered (or confirmed after follow-up) through radial-velocity (RV) surveys. Using ground-based spectrographs such as High Accuracy Radial Velocity Planetary Search (HARPS) and HARPS-North, it is now possible to detect planets that are only a few times the mass of the Earth. However, the presence of dark spots on the stellar surface produces RV signals that are very similar in amplitude to those caused by orbiting low-mass planets. Disentangling these signals has thus become the biggest challenge in the detection of Earth-mass planets using RV surveys. To do so, we use the star's lightcurve to model the RV variations produced by spots. Here we present this method and show the results of its application to CoRoT-7.

Keywords

astronomydetection of Earth-mass planetsstellar activitystudy of individual planetary systems: CoRoT-7techniques: radial velocities
Type
Research Article
Information
International Journal of Astrobiology , Volume 13 , Issue 2: Special issue: Fifth UK Astrobiology Conference (ASB5) , April 2014 , pp. 155 - 157
Copyright
Copyright © Cambridge University Press 2014 

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