J/A+A/663/A48ivo://CDS.VizieR/J/A+A/663/A48doi:10.26093/cds/vizier.36630048CDSQuirrenbach A.Passegger V.M.Trifonov T.Amado P.J.Caballero J.A.,Reiners A.Ribas I.Aceituno J.Bejar V.J.S.Chaturvedi P.,Gonzalez-Cuesta L.Henning T.Herrero E.Kaminski A.Kuerster M.,Lalitha S.Lodieu N.Lopez-Gonzalez M.J.Montes D.Palle E.Perger M.,Pollacco D.Reffert S.Rodriguez E.Rodriguez Lopez C.Shan Y.,Tal-Or L.Zapatero Osorio M.R.Zechmeister M.2022-11-13T17:14:17Z2022-07-14T16:28:54ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsradial-velocityvisible-astronomyThe CARMENES radial-velocity survey is currently searching for planets in a sample of 387 M dwarfs. Here we report on two Saturn-mass planets orbiting TYC 2187-512-1 (Mstar=0.50M_{sun}_) and TZ Ari (Mstar=0.15M_{sun}_), respectively. We obtained supplementary photometric time series, which we use along with spectroscopic information to determine the rotation periods of the two stars. In both cases, the radial velocities also show strong modulations at the respective rotation period. We thus modeled the radial velocities as a Keplerian orbit plus a Gaussian process representing the stellar variability. TYC 2187-512-1 is found to harbor a planet with a minimum mass of 0.33M_Jup_ in a near-circular 692-day orbit. The companion of TZ Ari has a minimum mass of 0.21M_Jup_, orbital period of 771d, and orbital eccentricity of 0.46. We provide an overview of all known giant planets in the CARMENES sample, from which we infer an occurrence rate of giant planets orbiting M dwarfs with periods up to 2 years in the range between 2% to 6%. TZ Ari b is only the second giant planet discovered orbiting a host with mass less than 0.3M_{sun}_. These objects occupy an extreme location in the planet mass versus host mass plane. It is difficult to explain their formation in core-accretion scenarios, so they may possibly have been formed through a disk fragmentation process.2022A&A...663A..48Qhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/663/A48CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/663/A48https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/663/A48http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/663/A48https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/663/A48https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/663/A48http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/663/A48GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/663/A48/tyc-visVisible-light RV data of TYC 2187-512-1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate (BJD-2450000)dtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVFormal radial velocity uncertaintym/sphys.veloc;pos.heliocentric;stat.errorfloatJ/A+A/663/A48/tyc-nidNear-IR RV data of TYC 2187-512-1recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate (BJD-2450000)dtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVFormal radial velocity uncertaintym/sphys.veloc;pos.heliocentric;stat.errorfloatJ/A+A/663/A48/tz-visVisible-light RV data of TZ AriRVRadial velocitym/sphys.veloc;pos.heliocentricfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate (BJD-2450000)dtime.epochdoublee_RVFormal radial velocity uncertaintym/sphys.veloc;pos.heliocentric;stat.errorfloatJ/A+A/663/A48/tz-nirNear-IR RV data of TZ ArirecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateDate (BJD-2450000)dtime.epochdoubleRVRadial velocitym/sphys.veloc;pos.heliocentricfloate_RVFormal radial velocity uncertaintym/sphys.veloc;pos.heliocentric;stat.errorfloat