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Revisiting the transits of CoRoT-7b at a lower activity level

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Date
09/2014
Author
Barros, S. C. C.
Almenara, J. M.
Deleuil, M.
Diaz, R. F.
Csizmadia, Sz
Cabrera, J.
Chaintreuil, S.
Collier Cameron, A.
Hatzes, A.
Haywood, R.
Lanza, A. F.
Aigrain, S.
Alonso, R.
Borde, P.
Bouchy, F.
Deeg, H. J.
Erikson, A.
Fridiund, M.
Grziwa, S.
Gandolfi, D.
Guillot, T.
Guenther, F.
Leger, A.
Moutou, C.
Ollivier, M.
Pasternacki, T.
Patzold, M.
Rauer, H.
Rouan, D.
Santerne, A.
Schneider, J.
Wuchter, G.
Funder
Science & Technology Facilities Council
Science & Technology Facilities Council
Grant ID
ST/J001651/1
PP/F000065/1
Keywords
stars: individual: CoRoT-7b
planetary systems
stars: activity
techniques: photometric
methods: observational
Radial-velocity variations
Super-Earths
Stellar activity
Extrasolar planets
Space mission
Light curves
Mass
Hot
Parameters
Exoplanet
QC Physics
QB Astronomy
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Abstract
The first super-Earth with measured radius discovered was CoRoT-7b and it has opened the new field of rocky exoplanet characterisation. To better understand this interesting system, new observations were taken with the CoRoT satellite. During this run 90 new transits were obtained in the imagette mode. These were analysed together with the previous 151 transits obtained in the discovery run and HARPS radial velocity observations to derive accurate system parameters. A difference is found in the posterior probability distribution of the transit parameters between the previous CoRoT run (LRa01) and the new run (LRa06). We propose that this is due to an extra noise component in the previous CoRoT run suspected of being transit spot occultation events. These lead to the mean transit shape becoming V-shaped. We show that the extra noise component is dominant at low stellar flux levels and reject these transits in the final analysis. We obtained a planetary radius, R-p = 1.585 +/- 0.064 R-circle plus, in agreement with previous estimates. Combining the planetary radius with the new mass estimates results in a planetary density of 1.19 +/- 0.27 rho(circle plus). which is consistent with a rocky composition. The CoRoT-7 system remains an excellent test bed for the effects of activity in the derivation of planetary parameters in the shallow transit regime.
Citation
Barros , S C C , Almenara , J M , Deleuil , M , Diaz , R F , Csizmadia , S , Cabrera , J , Chaintreuil , S , Collier Cameron , A , Hatzes , A , Haywood , R , Lanza , A F , Aigrain , S , Alonso , R , Borde , P , Bouchy , F , Deeg , H J , Erikson , A , Fridiund , M , Grziwa , S , Gandolfi , D , Guillot , T , Guenther , F , Leger , A , Moutou , C , Ollivier , M , Pasternacki , T , Patzold , M , Rauer , H , Rouan , D , Santerne , A , Schneider , J & Wuchter , G 2014 , ' Revisiting the transits of CoRoT-7b at a lower activity level ' , Astronomy & Astrophysics , vol. 569 , A74 . https://doi.org/10.1051/0004-6361/201423939
Publication
Astronomy & Astrophysics
Status
Peer reviewed
DOI
https://doi.org/10.1051/0004-6361/201423939
ISSN
0004-6361
Type
Journal article
Rights
Reproduced with permission from Astronomy & Astrophysics, © ESO
Collections
  • University of St Andrews Research
URI
http://hdl.handle.net/10023/5823

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