J/A+A/602/A88ivo://CDS.VizieR/J/A+A/602/A88doi:10.26093/cds/vizier.36020088CDSAstudillo-Defru N.Forveille T.Bonfils X.Segransan D.Bouchy F.,Delfosse X.Lovis C.Mayor M.Murgas F.Pepe F.Santos N.C.Udry S.,Wunsche A.2017-07-17T11:37:59Z2017-06-20T09:59:22ZCDS support team

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

cds-question@unistra.frm-starsmultiple-starssolar-system-planetsradial-velocityLow mass stars are currently the best targets for searches for rocky planets in the habitable zone of their host star. Over the last 13 years, precise radial velocities measured with the HARPS spectrograph have identified over a dozen super-Earths and Earth-mass planets (msini<=10M_{sun}_) around M dwarfs, with a well understood selection function. This well defined sample informs on their frequency of occurrence and on the distribution of their orbital parameters, and therefore already constrains our understanding of planetary formation. The subset of these low-mass planets that were found within the habitable zone of their host star also provide prized targets for future atmospheric biomarkers searches. We are working to extend this planetary sample to lower masses and longer periods through dense and long-term monitoring of the radial velocity of a small M dwarf sample. We obtained large numbers of HARPS spectra for the M dwarfs GJ 3138, GJ 3323, GJ 273, GJ 628 and GJ 3293, from which we derived radial velocities (RVs) and spectroscopic activity indicators. We searched them for variabilities, periodicities, Keplerian modulations and correlations, and attribute the radial-velocity variations to combinations of planetary companions and stellar activity. We detect 12 planets, of which 9 are new with masses ranging from 1.17 to 10.5M_{sun}_. Those planets have relatively short orbital periods (P<40d), except two of them with periods of 217.6 and 257.8 days. Among these systems, GJ 273 harbor two planets with masses close to the one of the Earth. With a distance of 3.8 parsec only, GJ 273 is the second nearest known planetary system - after Proxima Centauri - with a planet orbiting the circumstellar habitable zone.2017A&A...602A..88Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/602/A88CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/600/A13 : HARPS M dwarf sample magnetic activity (Astudillo-Defru+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/602/A88https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/602/A88http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/602/A88https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/602/A88https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/602/A88http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/602/A88GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/602/A88/list (List of studied stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/602/A88/list?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/602/A88/list?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/602/A88/list?GETtext/xml+votable180.050000true32.2954167-16.33958330.0055555555555555566/22309 22645 30771 34767 36555https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/602/A88?format=asciiOpticaldefaultJ/A+A/602/A88/listList of studied starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar namemeta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainSpTypeSpectral type from Hawley et al. (1996AJ....112.2799H, Cat. III/198)src.spTypecharProt? Rotational period From Astudillo-Defru et al. (2017, Cat. J/A+A/600/A13), where the typical error is 8.7%dtime.periodintnullableProt2? Rotational period (this work), from the periodogram of activity indicesdtime.periodfloatnullableVCShow the Radial Velocity curvesmeta.ref.urlcharFileNameName of the table with radial velocity datameta.id;meta.tablecharJ/A+A/602/A88/tablea1Radial velocities time series for GJ 3138recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (BJD-2400000)dtime.epochdoubleRVRadial velocity (1)km/sphys.veloc;pos.heliocentricdoublesigmaRadial velocity dispersionkm/sspect.dopplerVelocdoubleFWHMFWHM of the cross-correlation functionkm/sspect.line.widthdoubleContrastContrast of the cross-correlation functionphys.velocdoubleBIS? Bisector span of the cross-correlation functionkm/sphys.velocdoublenullableS-index? S-indexphot.flux;arith.ratiodoublenullableHa? H{alpha} indexspect.index;em.line.HalphadoublenullableJ/A+A/602/A88/tablea2Radial velocities time series for GJ 3323recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (BJD-2400000)dtime.epochdoubleRVRadial velocity (1)km/sphys.veloc;pos.heliocentricdoublesigmaRadial velocity dispersionkm/sspect.dopplerVelocdoubleFWHMFWHM of the cross-correlation functionkm/sspect.line.widthdoubleContrastContrast of the cross-correlation functionphys.velocdoubleBIS? Bisector span of the cross-correlation functionkm/sphys.velocdoublenullableS-index? S-indexphot.flux;arith.ratiodoublenullableHa? H{alpha} indexspect.index;em.line.HalphadoublenullableJ/A+A/602/A88/tablea5Radial velocities time series for GJ 3293Ha? H{alpha} indexspect.index;em.line.HalphadoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (BJD-2400000)dtime.epochdoubleRVRadial velocity (1)km/sphys.veloc;pos.heliocentricdoublesigmaRadial velocity dispersionkm/sspect.dopplerVelocdoubleFWHMFWHM of the cross-correlation functionkm/sspect.line.widthdoubleContrastContrast of the cross-correlation functionphys.velocdoubleBIS? Bisector span of the cross-correlation functionkm/sphys.velocdoublenullableS-index? S-indexphot.flux;arith.ratiodoublenullableJ/A+A/602/A88/tablea3Radial velocities time series for GJ 273Ha? H{alpha} indexspect.index;em.line.HalphadoublenullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (BJD-2400000)dtime.epochdoubleRVRadial velocity (1)km/sphys.veloc;pos.heliocentricdoublesigmaRadial velocity dispersionkm/sspect.dopplerVelocdoubleFWHMFWHM of the cross-correlation functionkm/sspect.line.widthdoubleContrastContrast of the cross-correlation functionphys.velocdoubleBIS? Bisector span of the cross-correlation functionkm/sphys.velocdoublenullableS-index? S-indexphot.flux;arith.ratiodoublenullableJ/A+A/602/A88/tablea4Radial velocities time series for GJ 628recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBJDBarycentric Julian date (BJD-2400000)dtime.epochdoubleRVRadial velocity (1)km/sphys.veloc;pos.heliocentricdoublesigmaRadial velocity dispersionkm/sspect.dopplerVelocdoubleFWHMFWHM of the cross-correlation functionkm/sspect.line.widthdoubleContrastContrast of the cross-correlation functionphys.velocdoubleBIS? Bisector span of the cross-correlation functionkm/sphys.velocdoublenullableS-index? S-indexphot.flux;arith.ratiodoublenullableHa? H{alpha} indexspect.index;em.line.Halphadoublenullable