J/A+A/509/A24ivo://CDS.VizieR/J/A+A/509/A24doi:10.26093/cds/vizier.35090024CDSHan I.Lee B.C.Kim K.M.Mkrtichian D.E.Hatzes A.P.Valyavin G.2017-06-27T06:37:33Z2010-03-28T07:34:33ZCDS support team

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

cds-question@unistra.frgiant-starssolar-system-planetsradial-velocityOur primary goal is to search for planets around intermediate mass stars. We are also interested in studying the nature of radial velocity (RV) variations of K giant stars. We selected about 55 early K giant (K0-K4) stars brighter than fifth magnitude that were observed using BOES, a high resolution spectrograph attached to the 1.8m telescope at BOAO (Bohyunsan Optical Astronomy Observatory). BOES is equipped with I_2_ absorption cell for high precision RV measurements. We detected a periodic radial velocity variations in the K0 III star gamma1 Leo with a period of P=429-days. An orbital fit of the observed RVs yields a period of P=429-days, a semi-amplitude of K=208m/s, and an eccentricity of e=0.14. To investigate the nature of the RV variations, we analyzed the photometric, Ca II {lambda} 8662 equivalent width, and line-bisector variations of gamma1 Leo. We conclude that the detected RV variations can be best explained by a planetary companion with an estimated mass of msini=8.78M_{Jupiter}_ and a semi-major axis of a=1.19AU, assuming a stellar mass of 1.23M_{sun}_.2010A&A...509A..24Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/509/A24CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/509/A24https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/509/A24http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/509/A24https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/509/A24https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/509/A24http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/509/A24GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/509/A24/table3Radial velocity of gamma1 LeorecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date of the observationtime.epochdoubleRVRadial velocitykm/sspect.dopplerVeloc;pos.heliocentricdoublee_RVStandard error of RVkm/sstat.errordouble