J/A+A/590/A112ivo://CDS.VizieR/J/A+A/590/A112doi:10.26093/cds/vizier.35900112CDSMancini L.Lillo-Box J.Southworth J.Borsato L.Gandolfi D.,Ciceri S.Barrado D.Brahm R.Henning T.2019-06-17T16:15:49Z2016-05-25T08:10:46ZCDS support team

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

cds-question@unistra.frmultiple-starssolar-system-planetsradial-velocityWe confirm the planetary nature of Kepler-539 b (aka Kepler object of interest K00372.01), a giant transiting exoplanet orbiting a solar-analogue G2V star. The mass of Kepler-539 b was accurately derived thanks to a series of precise radial velocity measurements obtained with the CAFE spectrograph mounted on the CAHA 2.2-m telescope. A simultaneous fit of the radial-velocity data and Kepler photometry revealed that Kepler-539 b is a dense Jupiter-like planet with a mass of Mp=0.97M_Jup_ and a radius of Rp=0.747R_Jup_, making a complete circular revolution around its parent star in 125.6-days. The semi-major axis of the orbit is roughly 0.5au, implying that the planet is at 0.45au from the habitable zone. By analysing the mid-transit times of the 12 transit events of Kepler-539 b recorded by the Kepler spacecraft, we found a clear modulated transit time variation (TTV), which is attributable to the presence of a planet c in a wider orbit. The few timings available do not allow us to precisely estimate the properties of Kepler-539 c and our analysis suggests that it has a mass between 1.2 and 3.6 M_Jup_, revolving on a very eccentric orbit (0.4<e<0.6) with a period larger than 1000-days. The high eccentricity of planet c is the probable cause of the TTV modulation of planet b. The analysis of the CAFE spectra revealed a relatively high photospheric lithium content, A(Li)=2.48dex, which, together with both a gyrochronological and isochronal analysis, suggests that the parent star is relatively young.2016A&A...590A.112Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/590/A112CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/MNRAS/444/776 : Transiting planets WASP-24, 25 and 26 (Southworth+, 2014)J/MNRAS/436/2 : Transits of WASP-19b (Mancini+, 2013)J/A+A/573/L5 : Radial velocity data of Kepler-432 (Ciceri+, 2015)J/A+A/576/A88 : 8 KOI eclipsing binaries radial velocities (Lillo-Box+, 2015)J/A+A/580/A63 : HATS-13b and HATS-14b light and RV curves (Mancini+, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/590/A112https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/590/A112http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/590/A112https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/590/A112https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/590/A112http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/590/A112GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/590/A112/k539_rvRVs of Kepler-539 (CAFE/CAHA 2.2-m telescope) (table 1)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric JD for the midpoint of observation (BJD-2400000)dtime.epochdoubleRVRadial velocity of the targetkm/sphys.veloc;pos.heliocentricfloate_RVMeasurement error of the radial velocitykm/sstat.errorfloatFWHMCCF FWHM of the spectrumkm/sspect.line.widthfloatBVSCCF bisector velocity span of the spectrumkm/sphys.velocfloat