SOPHIE velocimetry of Kepler transit candidates: a joint photometric, spectroscopic and dynamical analysis of the Kepler-117 system

BRUNO, G.; ALMENARA, J.-M.; BARROS, S. C. C.; SANTERNE, A.; DÍAZ, R. F.; DELEUIL, M.; DAMIANI, C.; BONOMO, A. S.; BOISSE, I.; BOUCHY, F.; HÉBRARD, G.; MONTAGNIER, G.

Toulouse

Simposio; The Space Photometry Revolution - CoRoT Symposium 3, Kepler KASC-7 Joint Meeting; 2014

We present the analysis of the multi-planetary system Kepler-117, whichis part of our program of observations of Kepler planets. This system iscomposed of a ~ 30 MEarth planet in a ~ 19 days orbit and a ~2 MJ planet orbiting in ~ 51 days. Both the orbits have loweccentricity. The planets are not close to an exact low-order meanmotion resonance, but exhibit significant transit timing variations(TTVs) nevertheless. We perform a combined Markov Chain Monte Carlo fiton all the available data: the Kepler photometry, the TTVs, the radialvelocities we obtained with SOPHIE/OHP and the stellar parameters. Theprime result is that the modelling of the TTVs allows to increase theprecision on the system parameters which are not constrained by theradial velocities alone.