[en] 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Haywood, R. D.; School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK
Cameron, A. C.; School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK
Queloz, D.; Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
Barros, S. C. C.; Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
Deleuil, M.; Aix Marseille Université, CNRS, LAM (Laboratoire d'Astrophysique de Marseille) UMR 7326, 13388, Marseille, France
Fares, R.; School of Physics and Astronomy, University of St Andrews, St Andrews KY16 9SS, UK
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
Boisse I., Bonfils X., Santos N. C., 2012, A&A, 545, 109
Bruntt H. et al., 2010, A&A, 519, A51
Chib S., Jeliazkov I., 2001, J. Am. Stat. Assoc., 96, 270
Desort M., Lagrange A. M., Galland F., Udry S., Mayor M., 2007, A&A, 473, 983
Dumusque X. et al., 2012, Nature, 491, 207
Edelson R. A., Krolik J. H., 1988, ApJ, 333, 646
Ferraz-Mello S., Tadeu dos Santos M., Beaugé C., Michtchenko T. A., Rodríguez A., 2011, A&A, 531, A161
Ford E. B., 2006, ApJ, 642, 505
Gelman A., Carlin J. B., Stern H. S., Rubin D. B., 2004, Bayesian Data Analysis. Chapman and Hall, London
Gibson N. P., Aigrain S., Roberts S., Evans T. M., Osborne M., Pont F., 2011, MNRAS, 419, 2683
Gizon L., Duvall Jr T., Larsen R., 2001, in Brekke P., Fleck B., Gurman J. B., eds, Proc. IAU Symp. 203, Recent Insights into the Physics of the Sun and Heliosphere. ASP, San Francisco, p. 189
Gizon L., Birch A., Spruit H., 2010, ARA&A, 48, 289
Gregory P. C., 2007, MNRAS, 381, 1607
Hatzes A. P. et al., 2010, A&A, 520, A93
Hatzes A. P. et al., 2011, ApJ, 743, 75
Hussain G., 2002, Astron. Nachr., 323, 349
Jeffreys S. H., 1961, The Theory of Probability. Oxford Univ. Press, Oxford
Knutson H. A., Charbonneau D., Allen L. E., Burrows A., Megeath S. T., 2008, ApJ, 673, 526
Kopp G., Lean J. L., 2011, Geophys. Res. Lett., 38, L01706
Lagrange A. M., Desort M., Meunier N., 2010, A&A, 512, A38
Lanza A. F. et al., 2009, A&A, 493, 193
Lanza A. F. et al., 2010, A&A, 520, A53
Lanza A. F., Boisse I., Bouchy F., Bonomo A. S., Moutou C., 2011, A&A, 533, A44
Léger A. et al., 2009, A&A, 506, 287
Lissauer J. J. et al., 2011, ApJS, 197, 8
Lockwood G.W., Skiff B. A., HenryG.W., Henry S., Radick R. R., Baliunas S. L., Donahue R. A., Soon W., 2007, ApJS, 171, 260
Mayor M. et al., 2003, The Messenger, 114, 20
Metropolis N., Rosenbluth A.W., RosenbluthM. N., Teller A. H., Teller E., 1953, J. Chem. Phys., 21, 1087
Meunier N., Desort M., Lagrange A. M., 2010, A&A, 512, A39
Pont F., Aigrain S., Zucker S., 2010, MNRAS, 411, 1953
Queloz D. et al., 2001, A&A, 379, 279
Queloz D. et al., 2009, A&A, 506, 303
Rasmussen C. E., Williams C. K. I., 2006, Gaussian Processes for Machine Learning. MIT Press, Cambridge, MA
Schrijver C. J., 2002, Astron. Nachr., 323, 157
Tuomi M., Anglada-Escudé G., Jenkins J. S., Jones H. R. A., 2014, preprint (arXiv:1405.2016)
