J/PASP/136/H4202ivo://CDS.VizieR/J/PASP/136/H4202doi:10.26093/cds/vizier.61373202CDSYamaguchi N.El-Badry K.Rees N.R.Shahaf S.Mazeh T.Andrae R.2025-10-30T20:16:48Z2025-07-25T10:37:18ZCDS support team

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

cds-question@unistra.frmultiple-starswhite-dwarf-starsradial-velocityvisible-astronomyAstrometry from Gaia DR3 has enabled the discovery of a sample of 3000+ binaries containing white dwarfs (WD) and main-sequence (MS) stars in relatively wide orbits, with orbital periods Porb=(100-1000) days. This population was not predicted by binary population synthesis models before Gaia and - if the Gaia orbits are robust - likely requires very efficient envelope ejection during common envelope evolution (CEE). To assess the reliability of the Gaia solutions, we measured multi-epoch radial velocities (RVs) of 31 WD+MS binary candidates with Porb=(40-300) days and AstroSpectroSB1 orbital solutions. We jointly fit the RVs and astrometry, allowing us to validate the Gaia solutions and tighten constraints on component masses. We find a high success rate for the Gaia solutions, with only 2 out of the 31 systems showing significant discrepancies between their Gaia orbital solutions and our RVs. Joint fitting of RVs and astrometry allows us to directly constrain the secondary-to-primary flux ratio , and we find S<~0.02 for most objects, confirming the companions are indeed WDs. We tighten constraints on the binaries' eccentricities, finding a median e~0.1. These eccentricities are much lower than those of normal MS+MS binaries at similar periods, but much higher than predicted for binaries formed via stable mass transfer. We present MESA single and binary evolution models to explore how the binaries may have formed. The orbits of most binaries in the sample can be produced through CEE that begins when the WD progenitor is an AGB star, corresponding to initial separations of 2-5au. Roughly 50% of all post-common envelope binaries are predicted to have first interacted on the AGB, ending up in wide orbits like these systems.2024PASP..136h4202Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/136/H4202CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/136/H4202https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/136/H4202http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/136/H4202https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/136/H4202https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/136/H4202http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/136/H4202GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/136/H4202/table1 (Basic Information from Gaia DR3 of all Objects Studied in this Work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/136/H4202/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/136/H4202/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/136/H4202/table1?GETtext/xml+votable180.050000true301.7364612.576630.0055555555555555566/12811 17802 21075 21249 25109 29789 30083 30110 30882 31717 32044 33480 33555 33722 34156 34655 34870 35015 36379 36385 39087 42305 42642 42862 45369 45541 45679 46042 47128 47161 473451.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/136/H4202?format=asciiOpticaldefaultJ/PASP/136/H4202/table1Basic Information from Gaia DR3 of all Objects Studied in this WorkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (JHHMM+DDMM)meta.id;meta.maincharGaiaDR3Gaia DR3 Source IDmeta.idRA_ICRSRight ascension (ICRS) at Ep=2016.0degpos.eq.ra;meta.mainDE_ICRSDeclination (ICRS) at Ep=2016.0degpos.eq.dec;meta.mainGmagGaia G magnitudemagphot.mag;em.opt.VfloatGoFGoF is the Gaia goodness_of_fitstat.fit.goodnessfloatPorbOrbital period reported by Gaiadtime.periodfloatplxGaia parallaxmaspos.parallax.trigfloate_plxGaia parallax errormasstat.error;pos.parallaxfloatnRVNumber of RVs we measured for each objectmeta.numberintSimbadSimbad column added by the CDSmeta.ref.urlcharJ/PASP/136/H4202/table2All RVs Collected for the 31 Objects of this WorkrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameName (JHHMM+DDMM)meta.id;meta.maincharGaiaDR3Gaia DR3 Source IDmeta.idJDJulian date of observationdtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorkm/sstat.errorfloatInstInstrument/Catalogmeta.notechar