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. and Wuchter, G. (2014). Revisiting the transits of CoRoT-7b at a lower activity level. Astron. Astrophys., 569. LES ULIS CEDEX A: EDP SCIENCES S A. ISSN 1432-0746

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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.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Barros, S. C. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Almenara, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deleuil, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Diaz, R. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Csizmadia, SzUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cabrera, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Chaintreuil, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Collier Cameron, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hatzes, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Haywood, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lanza, A. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Aigrain, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Alonso, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Borde, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bouchy, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Deeg, H. J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Erikson, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Fridiund, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grziwa, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gandolfi, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guillot, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Guenther, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Leger, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moutou, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ollivier, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Pasternacki, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Patzold, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rauer, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Rouan, D.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Santerne, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schneider, J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Wuchter, G.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-431019
DOI: 10.1051/0004-6361/201423939
Journal or Publication Title: Astron. Astrophys.
Volume: 569
Date: 2014
Publisher: EDP SCIENCES S A
Place of Publication: LES ULIS CEDEX A
ISSN: 1432-0746
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
RADIAL-VELOCITY VARIATIONS; SUPER-EARTHS; STELLAR; PLANET; MASS; HOT; PARAMETERS; EXOPLANET; MODELS; I.Multiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/43101

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