Planets and stellar activity: Hide and seek in the CoRoT-7 system

R. D. Haywood, A. C. Cameron, D. Queloz, S. C.C. Barros, M. Deleuil, R. Fares, M. Gillon, A. Hatzes, A. F. Lanza, C. Lovis, C. Moutou, F. Pepe, D. Pollacco, A. Santerne, D. Ségransan, Y. Unruh

Research output: Chapter in Book/Report/Conference proceedingConference contribution


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.

Original languageEnglish
Title of host publicationExploring the Formation and Evolution of Planetary Systems
PublisherCambridge University Press
Number of pages4
ISBN (Print)9781107045200
Publication statusPublished - Jun 2013
Externally publishedYes

Publication series

NameProceedings of the International Astronomical Union
ISSN (Print)1743-9213
ISSN (Electronic)1743-9221


  • Planetary systems
  • RV method
  • Stellar activity

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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