J/MNRAS/484/5362ivo://CDS.VizieR/J/MNRAS/484/5362doi:10.26093/cds/vizier.74845362CDSAshley R.P.Farihi J.Marsh T.R.Wilson D.J.Gansicke B.T.2024-08-19T20:16:57Z2019-10-18T07:34:32ZCDS support team

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

cds-question@unistra.frmultiple-starswhite-dwarf-starsm-starsradial-velocityWe present the results of a radial velocity survey of 20 white dwarf plus M dwarf binaries selected as a follow up to a Hubble Space Telescope study that aimed to spatially resolve suspected binaries. Our candidates are taken from the list of targets that were spatially unresolved with Hubble. We have determined the orbital periods for 16 of these compact binary candidates. The period distribution ranges from 0.14 to 9.16d and peaks near 0.6d. The original sample therefore contains two sets of binaries, wide orbits (~100-1000au) and close orbits (~1-10au), with no systems found in the ~10-100au. This observational evidence confirms the bimodal distribution predicted by population models and is also similar to results obtained in previous studies. We find no binary periods in the months to years range, supporting the post common envelope evolution scenario. One of our targets, WD 1504+546, was discovered to be an eclipsing binary with a period of 0.93d.2019MNRAS.484.5362Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/484/5362CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/125/2621 : SDSS WD-M binary parameters (Raymond+, 2003)J/AJ/129/2428 : M dwarf-white dwarf binary systems (Silvestri+, 2005)J/AJ/131/1674 : Close binary systems from SDSS DR4 (Silvestri+, 2006)J/AJ/134/741 : New close binary systems from the SDSS DR5 (Silvestri+, 2007)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/484/5362https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/484/5362http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/484/5362https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/484/5362https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/484/5362http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/484/5362GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/484/5362/table1 (The targets observed during the campaign.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/484/5362/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/484/5362/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/484/5362/table1?GETtext/xml+votable180.050000true6.63833339.1508330.0055555555555555566/1746 2695 4455 4880 5397 5942 5946 6616 8438 11031 11336 11370 11416 11813 20100 20209 23208 23501 40682 44614https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/484/5362?format=asciidefaultJ/MNRAS/484/5362/table1The targets observed during the campaign.recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWD name (HHMM+DDd)meta.id;meta.maincharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainNspNumber of spectra taken (1)meta.numberintNspuNumber of usable spectra (2)meta.numberintVCShow the Radial Velocity curvesmeta.ref.urlcharJ/MNRAS/484/5362/tableb1Measured radial velocities of our targets from a fit of a double-Gaussian to the NaI doublet at 8190{AA}recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintWDWD namemeta.id;meta.maincharHJDHeliocentric Julian datedtime.epochdoubleRVRadial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVRadial velocity errorkm/sstat.errordouble