J/A+A/573/A124ivo://CDS.VizieR/J/A+A/573/A124doi:10.26093/cds/vizier.35730124CDSBruno G.Almenara J.-M.Barros S.C.C.Santerne A.Diaz R.F.Deleuil M.,Damiani C.Bonomo A.S.Boisse I.Bouchy F.Hebrard G.Montagnier G.2017-06-13T11:08:14Z2015-01-09T07:36:39ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frmultiple-starssolar-system-planetsradial-velocityAs part of our follow-up campaign of Kepler planets, we observed Kepler-117 with the SOPHIE spectrograph at the Observatoire de Haute-Provence. This F8-type star hosts two transiting planets in non-resonant orbits. The planets, Kepler-117 b and c, have orbital periods ~=18.8 and ~=50.8-days, and show transit-timing variations (TTVs) of several minutes. We performed a combined Markov chain Monte Carlo (MCMC) fit on transits, radial velocities, and stellar parameters to constrain the characteristics of the system. We included the fit of the TTVs in theMCMCby modeling them with dynamical simulations. In this way, consistent posterior distributions were drawn for the system parameters. According to our analysis, planets b and c have notably different masses (0.094+/-0.033 and 1.84+/-0.18M_J_) and low orbital eccentricities (0.0493+/-0.0062 and 0.0323+/-0.0033). The uncertainties on the derived parameters are strongly reduced if the fit of the TTVs is included in the combined MCMC. The TTVs allow measuring the mass of planet b, although its radial velocity amplitude is poorly constrained. Finally, we checked that the best solution is dynamically stable.2015A&A...573A.124Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/573/A124CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/ApJS/197/2 : Transit timing observations from Kepler. I. (Ford+, 2011)J/ApJ/756/185 : Kepler TTVs. V. Metrics catalog (Ford+, 2012)J/ApJ/756/186 : TTVs from Kepler. VI. Statistical tests (Steffen+, 2012)J/ApJS/208/16 : Kepler transit timing observations. VIII. (Mazeh+, 2013)J/A+A/528/A63 : Velocitometry transit of KOI-428b (Santerne+, 2011)J/A+A/544/L12 : Velocitometry transit of KOI-13 (Santerne+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/573/A124https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/573/A124http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/573/A124https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/573/A124https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/573/A124http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/573/A124GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/573/A124/tablea1Transit-timing variations for planet brecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[0/76] Epoch sequential numbermeta.recordintBJDMid-transit time (BJD-2450000)dtime.epochdoubleTTVTransit-timing variationminstat.fit.residualfloate_TTVrms uncertainty on TTVminstat.errorfloatJ/A+A/573/A124/tablea2Transit-timing variations for planet crecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintEpoch[0/76] Epoch sequential numbermeta.recordintBJDMid-transit time (BJD-2450000)dtime.epochdoubleTTVTransit-timing variationminstat.fit.residualfloate_TTVrms uncertainty on TTVminstat.errorfloat