J/A+A/664/A64ivo://CDS.VizieR/J/A+A/664/A64doi:10.26093/cds/vizier.36640064CDSGorrini P.Astudillo-Defru N.Dreizler S.Damasso M.Diaz R.F.,Bonfils X.Jeffers S.V.Barnes J.R.Del Sordo F.Almenara J.-M.,Artigau E.Bouchy F.Charbonneau D.Delfosse X.Doyon R.Figueira P.,Forveille T.Haswell C.A.Lopez-Gonzalez M.J.Melo C.Mennickent R.E.,Gaisne G.Morales N.Murgas F.Pepe F.Rodriguez E.Santos N.C.,Tal-Or L.Tsapras Y.Udry S.2022-09-30T23:29:31Z2022-08-09T08:48:12ZCDS support team

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

cds-question@unistra.frmultiple-starsexoplanetsvisible-astronomybroad-band-photometryradial-velocityspectroscopyGliese-832 (GJ 832) is an M2V star hosting a massive planet on a decade-long orbit, GJ 832b, discovered by radial velocity (RV). Later, a super Earth or mini-Neptune orbiting within the stellar habitable zone was reported (GJ 832c). The recently determined stellar rotation period (45.7+/-9.3 days) is close to the orbital period of putative planet c (35.68+/-0.03 days). We aim to confirm or dismiss the planetary nature of the RV signature attributed to GJ 832c, by adding 119 new RV data points, new photometric data, and an analysis of the spectroscopic stellar activity indicators. Additionally, we update the orbital parameters of the planetary system and search for additional signals. We performed a frequency content analysis of the RVs to search for periodic and stable signals. Radial velocity time series were modelled with Keplerians and Gaussian process (GP) regressions alongside activity indicators to subsequently compare them within a Bayesian framework. We updated the stellar rotational period of GJ 832 from activity indicators, obtaining 37.5^+1.4^_1.5_ days, improving the precision by a factor of 6. The new photometric data are in agreement with this value. We detected an RV signal near 18 days (FAP<4.6%), which is half of the stellar rotation period. Two Keplerians alone fail at modelling GJ 832b and a second planet with a 35-day orbital period. Moreover, the Bayesian evidence from the GP analysis of the RV data with simultaneous activity indices prefers a model without a second Keplerian, therefore negating the existence of planet c.2022A&A...664A..64Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/664/A64CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/664/A64https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/664/A64http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/664/A64https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/664/A64https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/664/A64http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/664/A64GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapOpticaldefaultJ/A+A/664/A64/activityActivity indices of GJ 832 from HARPS spectrographSS indexmeta.code;spect.indexdoubleNaDNaD indexmeta.code;spect.indexdoubleInstInstrument's namemeta.id;instrcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian datedtime.epochdoubleHalphaH-alpha indexspect.indexdoublee_HalphaH-alpha index errorstat.error;spect.linedoubleHbetaH-beta indexspect.indexdoublee_HbetaH-beta index errorstat.error;spect.linedoubleHgammaH-gamma indexspect.indexdoublee_HgammaH-gamma index errorstat.error;spect.linedoublee_NaDNaD index errorstat.errordoublee_SS index errorstat.errordoubleJ/A+A/664/A64/ash2Photometric data of GJ 832 from ASH2 telescoperecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian Datedtime.epochdoubleDmagDifferential magnitudemagphot.mag;arith.difffloate_DmagDifferential magnitude errormagstat.error;phot.mag;arith.difffloatFilter[BV] Filtermeta.id;instr.filtercharJ/A+A/664/A64/rvRV timeseries of GJ 832recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJDJulian Datedtime.epochdoubleRV? Radial velocity for HARPS and HARPS+ (1)m/sphys.veloc;pos.heliocentricdoublenullabledRV? Relative radial velocity for PFS and UCLESm/sphys.veloc;arith.difffloatnullablee_RVRadial velocity error (for RV and dRV)m/sstat.errorfloatInstInstrument's name (HARPS, HARPS+, PFS or UCLES)meta.id;instrchar