J/MNRAS/512/3383ivo://CDS.VizieR/J/MNRAS/512/3383doi:10.26093/cds/vizier.75123383CDSHwang H.-C.Ting Y.-S.Zakamska N.L.2025-05-06T20:14:13Z2025-03-28T12:59:47ZCDS support team

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

cds-question@unistra.frmultiple-starsorbitsastrometryproper-motionsstellar-distancevisible-astronomyEccentricity of wide binaries is difficult to measure due to their long orbital periods. With Gaia's high-precision astrometric measurements, eccentricity of a wide binary can be constrained by the angle between the separation vector and the relative velocity vector (the v-r angle). In this paper, by using the v-r angles of wide binaries in Gaia Early Data Release 3, we develop a Bayesian approach to measure the eccentricity distribution as a function of binary separations. Furthermore, we infer the eccentricities of individual wide binaries and make them publicly available. Our results show that the eccentricity distribution of wide binaries at 102 AU is close to uniform and becomes superthermal at >103 AU, suggesting two formation mechanisms dominating at different separation regimes. The close binary formation, most likely disc fragmentation, results in a uniform eccentricity distribution at <102 AU. The wide binary formation that leads to highly eccentric wide binaries at >103 AU may be turbulent fragmentation and/or the dynamical unfolding of compact triples. With Gaia, measuring eccentricities is now possible for a large number of wide binaries, opening a new window to understanding binary formation and evolution.2022MNRAS.512.3383Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/512/3383CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/350 : Gaia EDR3 (Gaia Collaboration, 2020)J/ApJS/246/4 : Catalog of ultrawide binary stars from Gaia DR2 (Tian+,2020)J/MNRAS/497/2250 : Gaia DR2 hot Jupiter hosts and contact binariesJ/MNRAS/480/4884 : Gaia wide binaries (El-Badry+, 2018)J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)J/MNRAS/456/2070 : Eccentricity distribution of wide binaries (Tokovinin+,2016)J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)J/A+A/380/238 : Long-period companions of multiple stars (Shatsky, 2001)https://zenodo.org/record/4435257 : Wide binaries of El-Badry et al.https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/512/3383https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/512/3383http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/512/3383https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/512/3383https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/512/3383http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/512/3383GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/512/3383/table2 (Eccentricities estimates of our wide binaries sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/512/3383/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/512/3383/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/512/3383/table2?GETtext/xml+votable180.050000true282.80943113005755.69246437610510.0055555555555555560/0-11 6/https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/512/3383?format=asciiOpticaldefaultJ/MNRAS/512/3383/table2Eccentricities estimates of our wide binaries samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaEDR3-1Gaia EDR3 source_id of the primary (source_id1)meta.id;meta.mainRA_ICRSRight ascension of the primary star from Gaia EDR3 (ICRS) at Ep=2016.0 (ra1)degpos.eq.ra;meta.mainindexedDE_ICRSDeclination of the primary star from Gaia EDR3 (ICRS) at Ep=2016.0 (dec1)degpos.eq.dec;meta.mainindexedGaiaEDR3-2Gaia EDR3 source_id of the secondary star (source_id2)meta.id.assocRA2degRight ascension of the secondary star from Gaia EDR3 (ICRS) at Ep=2016.0 (ra2)degpos.eq.raDE2degDeclination of the secondary star from Gaia EDR3 (ICRS) at Ep=2016.0 (dec2)degpos.eq.decSepProjected binary separation as described in El-Badry et al. 2021MNRAS.506.2269E (sep_AU) (1)AUpos.angDistance;src.orbitaldoubleRProbability R of being a chance-alignment pair as described in El-Badry et al. 2021MNRAS.506.2269E (R_chance_align) (1)stat.fit.goodnessdoublev-r? Measured v-r angle (vr_angle) (2)degsrc.orbital;pos.phaseAngdoublenullablee_v-rMean uncertainty of v-r (vr_angle_error)degstat.errordoubleSigDpmThe significance Sig of proper motion difference {Delta}{mu}/{sigma}{Delta}{mu} (dpm_sig) (3)stat.fit.goodness;pos.pm;arith.diffdoublealphaThe power index {alpha} used for the prior eccentricity distribution as described in equation 25 of the section 3.4 Bayesian inference for the eccentricity (alpha)stat.fit.param;stat.probabilitydoubleeThe most probable eccentricity (e)src.orbital.eccentricityfloatb_e