J/MNRAS/490/5088ivo://CDS.VizieR/J/MNRAS/490/5088doi:10.26093/cds/vizier.74905088CDSMugrauer M.2024-08-20T20:14:11Z2020-10-07T11:56:36ZCDS support team

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

cds-question@unistra.frmultiple-starsA new survey is presented, which explores the second data release of the ESA-Gaia mission, in order to search for stellar companions of exoplanet host stars, located at distances closer than about 500pc around the Sun. In total, 176 binaries, 27 hierarchical triples, and one hierarchical quadruple system are detected among more than 1300 exoplanet host stars, whose multiplicity is investigated, yielding a multiplicity rate of the exoplanet host stars of at least about 15 per cent. The detected companions and the exoplanet host stars are equidistant and share a common proper motion, as it is expected for gravitationally bound stellar systems, proven with their accurate Gaia astrometry. The companions exhibit masses in the range between about 0.078 and 1.4M_{sun}_ with a peak in their mass distribution between 0.15 and 0.3M{sun}_. The companions are separated from the exoplanet host stars by about 20 up to 9100au, but are found most frequently within a projected separation of 1000au. While most of the detected companions are early M dwarfs, eight white dwarf companions of exoplanet host stars are also identified in this survey, whose true nature is revealed with their photometric properties. Hence, these degenerated companions and the exoplanet host stars form evolved stellar systems with exoplanets, which have survived (physically but also dynamically) the post-main-sequence evolution of their former primary star.2019MNRAS.490.5088Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/490/5088CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/345 : Gaia DR2 (Gaia Collaboration, 2018)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/490/5088https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/490/5088http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/490/5088https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/490/5088https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/490/5088http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/490/5088GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/490/5088/table2 (Astrometry and photometry of planet host stars and companions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/490/5088/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/5088/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/5088/table2?GETtext/xml+votable180.050000true1.5798972-49.07518640.005555555555555556Cone search capability for table J/MNRAS/490/5088/table4 (Equatorial coordinates and properties of companions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/490/5088/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/490/5088/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/490/5088/table4?GETtext/xml+votable180.050000true1.58350950302-49.076438751980.0055555555555555566/725 876 1066 1597 2335 2472 2711 2737 4698 4716 4881 5009 5170 5718 5730 6006 6017 6638 6831 7240 7402 8197 8478 8825 8992 9653 10380 10730 11267 11455 11671 11732 11987 12482 12899 12983 13423 13464 13702 14191 14412 14419 14434 14522 14525 14579 14584 14586 14591 14667 14682 14744 14752 14756-14757 14759-14760 14765 14767 14777 14779 14794 14827 14830 14886 14914 14918 14924 14930-14931 14933 14938-14939 14953 14958 14963 14966 14970 14972 15044 15132 15134 15139 15146 15154 15160 15171 15174 15200 16035 16405 16432 16512 16667 17172 17496 17730 17764 18022 18329 18510 18800 19371 20339 20682 21003 21254 21989 22001 22015 22252 22505 22708 23201 23540 24115 24428 25401 25466 25604 25875 26242 26707 26844 26990 27078 27088 27393 27488 27777 28044 28258 28274 28433 29246 29349 30450 30466 30485 31428 31450 31860 32575 33182 33220 33243 33974 34471 34526 34860 34902 35039 35210 35362 35415 35532 35954 35968 36196 36794 37573 37955 38233 38238 38311 39007 39257 39474 39673 40862 40985 41515 42101 42760 42808 42989 43180 43233 43677 43911 44228 44379 44740 45168 45258 45865 45890 46287 46306 48076 48178 48251 48415 48530 48747 489451.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/490/5088?format=asciidefaultJ/MNRAS/490/5088/table2Astrometry and photometry of planet host stars and companionsSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCompindicates relative astrometry (table 3) and equatorial coordinates and properties (table 4) of companionsmeta.ref.urlcharNameStar Namemeta.id;meta.maincharprimaryn_Name[*] * for exoplanet host starsmeta.notecharPlxGaia DR2 parallaxmaspos.parallaxdoublee_PlxError of parallaxmasstat.error;pos.parallaxfloatpmRAGaia DR2 proper motion in right ascension, pmRA*cosDEmas/yrpos.pm;pos.eq.radoublee_pmRAError of proper motion in right ascensionmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEGaia DR2 proper motion in declinationmas/yrpos.pm;pos.eq.decdoublee_pmDEError of proper motion in declinationmas/yrstat.error;pos.pm;pos.eq.decfloatepsi? Gaia DR2 astrometric excess noisemasstat.valuefloatnullablesepsi? Gaia DR2 significance of astrometric excess noisestat.valuefloatnullableGmag? Gaia DR2 G-band mean magnitudemagphot.mag;em.optfloatnullablee_Gmag? Error of Gaia DR2 G-band mean magnitudemagstat.error;phot.magfloatnullableAG? Gaia DR2 estimate of G-band extinctionmagphys.absorptionfloatnullablee_AG? Lower error of G-band extinctionmagstat.errorfloatnullableE_AG? Upper error of G-band extinctionmagstat.error;stat.maxfloatnullableNote[x] x if AG is derived from AVmeta.notechar_RAPositions of the system (right ascension part)degpos.eq.ra;meta.main_DEPositions of the system (declination part)degpos.eq.dec;meta.mainJ/MNRAS/490/5088/table3Relative astrometry of companionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of stellar companion (1)meta.id;meta.maincharrhoAngular separationarcsecpos.angDistancedoublee_rhoError of angular separationarcsecstat.errordoublePAPosition angledegpos.posAngdoublee_PAError of position angledegstat.errordoubleDplxParallax differencemaspos.parallax;arith.difffloate_DplxError of parallax differencemasstat.errorfloatsDplxSignificance of parallax differencestat.fit.goodnessfloatsDplx-epsi? Significance of parallax difference including epsistat.fit.goodnessfloatnullablemu-relDifferential proper motion (2)mas/yrpos.pm;arith.difffloate_mu-relError of differential proper motionmas/yrstat.errorfloatsmu-relSignificance of differential proper motionstat.fit.goodnessfloatCPMCommon Proper Motion Index (3)meta.code.multipfloatJ/MNRAS/490/5088/table4Equatorial coordinates and properties of companionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName of stellar companionmeta.id;meta.maincharRA_ICRSRight Ascension (ICRS) at Ep=2015.5degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2015.5degpos.eq.dec;meta.mainGMAGAbsolute magnitude in G-bandmagphys.magAbsfloatSepProjected separation to the exoplanet host staraupos.angDistanceintl_Mass[~] Limit flag on Massmeta.code.error;phys.masscharMassMasssolMassphys.massfloatTeff? Effective temperatureKphys.temperature.effectiveintnullableNote[WD ] WD if companion is a white dwarfmeta.notechar