J/A+A/621/A110ivo://CDS.VizieR/J/A+A/621/A110doi:10.26093/cds/vizier.36210110CDSBarbato D.Sozzetti A.Biazzo K.Malavolta L.Santos N.C.Damasso M.,Lanza A.F.Pinamonti M.Affer L.Benatti S.Bignamini A.Bonomo A.S.,Borsa F.Carleo I.Claudi R.Cosentino R.Covino E.Desidera S.,Esposito M.Giacobbe P.Gonzalez-Alvarez E.Gratton R.Harutyunyan A.,Leto G.Maggio A.Maldonado J.Mancini L.Masiero S.Micela G.,Molinari E.Nascimbeni V.Pagano I.Piotto G.Poretti E.Rainer M.,Scandariato G.Smareglia R.Colombo L.S.Di Fabrizio L.Faria J.P.,Martinez Fiorenzano A.Molinaro M.Pedani M.2021-08-20T07:56:46Z2019-01-15T08:23:09ZCDS support team

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

cds-question@unistra.frmultiple-starsgiant-starsradial-velocityStatistical studies of exoplanets have shown that giant planets are more commonly hosted by metal-rich dwarf stars than low-metallicity stars, while no such correlation is evident for lower mass planets. The search for giant planets around metal-poor stars and the estimate of their occurrence f_p_ is an important element in providing support to models of planet formation. We present results from the HARPS-N search for giant planets orbiting metal-poor (-1.0<=[Fe/H]<=-0.5dex) stars in the northern hemisphere, complementing a previous HARPS survey on southern stars in order to update the estimate of f_p_. High-precision HARPS-N observations of 42 metal-poor stars were used to search for planetary signals to be fitted using differential evolution Markov chain Monte Carlo single-Keplerian models. We then joined our detections to the results of the previous HARPS survey on 88 metal-poor stars to provide a preliminary estimate of the two-hemisphere f_p_. We report the detection of two new giant planets around HD 220197 and HD 233832. The first companion has Msini=0.20_-0.04_^+0.07^MJup and an orbital period of 1728_-80_^+162^days, and for the second companion, we find two solutions of equal statistical weight with periods of 2058_-40_^+47^ and 4047_-117_^+91^days and minimum masses of 1.78_-0.06_^+0.08^ and 2.72_-0.23_^+0.23^MJup, respectively. Joining our two detections with the three from the southern survey, we obtain a preliminary and conservative estimate of the global frequency of f_p_=3.84_-1.06_^+2.45^% for giant planets around metal-poor stars. The two new giant planets orbit dwarf stars at the metal-rich end of the HARPS-N metal-poor sample. This corroborates previous results that suggested that giant planet frequency is still a rising function of the host star [Fe/H]. We also note that all detections in the overall sample are giant long-period planets.2019A&A...621A.110Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/621/A110CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/621/A110https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/621/A110http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/621/A110https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/621/A110https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/621/A110http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/621/A110GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/621/A110/table5HARPS-N radial velocity measurements and exposure times, activity indexes and airmassrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStarHost star name (HD 220197 or HD 233832)meta.id;meta.maincharBJDEpochs of radial velocitiesdtime.epochdoubleTexpExposure timestime.duration;obs.exposureintRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity uncertaintykm/sstat.errorfloatBISBisector inverse spankm/sphys.velocfloatFWHMCCF full-width at half-maximumkm/sspect.line.widthfloatFWHMcorr? CCF full-width at half-maximum (corrected)km/sspect.line.widthfloatnullablelogRHKActivity index logRHKphot.flux;arith.ratiofloatAirMassAir mass at exposure startobs.airMassfloat