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Planets and stellar activity : hide and seek in the CoRoT-7 system
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Haywood, R. D., Cameron, A. C., Queloz, D., Barros, S. C. C., Deleuil, M., Fares, R., Gillon, M., Hatzes, A., Lanza, A. F., Lovis, C., Moutou, C., Pepe, F., Pollacco, Don, Santerne, A., Ségransan, D. and Unruh, Y. (2013) Planets and stellar activity : hide and seek in the CoRoT-7 system. Proceedings of the International Astronomical Union, Volume 8 (Symposium S299). pp. 237-240. doi:10.1017/S1743921313008478 ISSN 1743-9213.
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Official URL: http://dx.doi.org/10.1017/S1743921313008478
Abstract
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.
Item Type: | Journal Article | ||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||
Journal or Publication Title: | Proceedings of the International Astronomical Union | ||||||
Publisher: | Cambridge University Press | ||||||
ISSN: | 1743-9213 | ||||||
Official Date: | June 2013 | ||||||
Dates: |
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Volume: | Volume 8 | ||||||
Number: | Symposium S299 | ||||||
Page Range: | pp. 237-240 | ||||||
DOI: | 10.1017/S1743921313008478 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
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