J/MNRAS/471/4218ivo://CDS.VizieR/J/MNRAS/471/4218doi:10.26093/cds/vizier.74714218CDSKilic M.Brown W.R.Gianninas A.Curd B.Bell K.J.Allende Prieto C.2024-08-17T20:20:34Z2020-07-22T13:27:54ZCDS support team

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

cds-question@unistra.frmultiple-starswhite-dwarf-starsradial-velocityWe present the results from a Gemini snapshot radial-velocity survey of 44 low-mass white-dwarf candidates selected from the Sloan Digital Sky Survey (SDSS) spectroscopy. To find sub-hour orbital period binary systems, our time-series spectroscopy had cadences of 2-8min over a period of 20-30min. Through follow-up observations at Gemini and the MMT, we identify four double-degenerate binary systems with periods ranging from 53min to 7h. The shortest period system, SDSS J123549.88+154319.3, was recently identified as a sub-hour period detached binary by Breedt and collaborators. Here, we refine the orbital and physical parameters of this system. High-speed and time-domain survey photometry observations do not reveal eclipses or other photometric effects in any of our targets. We compare the period distribution of these four systems with the orbital period distribution of known double white dwarfs; the median period decreases from 0.64 to 0.24d for M=0.3-0.5M_{sun}_ to M<0.3M_{sun}_ white dwarfs. However, we do not find a statistically significant correlation between the orbital period and white-dwarf mass.2017MNRAS.471.4218Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/471/4218CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/471/4218https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/471/4218http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/471/4218https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/471/4218https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/471/4218http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/471/4218GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/471/4218/table1 (Physical parameters and the summary of radial velocity measurements for our targets.)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/4218/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/4218/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/4218/table1?GETtext/xml+votable180.050000true114.2857136.03750780.005555555555555556Cone search capability for table J/MNRAS/471/4218/table2 (Orbital parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/471/4218/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/471/4218/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/471/4218/table2?GETtext/xml+votable180.050000true128.695451930.83315890.0055555555555555566/4174 4217 4613 5042 5109 5126 5448 6341 6361 6530 6546 8382 8657 8715 8839 9045 9204 9323 10192 10442 10614 10696 10973 11950 12289 13413 17357 18008 18779 19246 19591 26260 27254 27410 27787 27949 27985 28409 31293 31318 32459 32509 36730 48894https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/471/4218?format=asciidefaultJ/MNRAS/471/4218/table1Physical parameters and the summary of radial velocity measurements for our targets.SimbadNameSimbad column added by the CDSmeta.idcharNNumber of spectrameta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSObject SDSS name (JHHMMSS.ss+DDMMSS,s)meta.id;meta.maincharg0magDeredenned g magnitudemagphot.mag;em.opt.RfloatTeffEffective temperatureKphys.temperature.effectiveinte_TeffEffective temperature errorKstat.error;phys.temperature.effectiveintloggSurface gravitylog(cm.s**-2)phys.gravityfloate_loggSurface gravity errorlog(cm.s**-2)stat.errorfloatM? MasssolMassphys.massfloatnullablee_M? Mass errorsolMassstat.errorfloatnullableRVMeanMean radial velocitykm/sphys.veloc;stat.meanfloate_RVMeanMean radial velocity errorkm/sstat.errorfloatchi2chi^2^ valuestat.fit.chi2;stat.valuefloatlog(p)Probability, p, of obtaining the observed value of chi^2^ or higher from random fluctuations of a constant velocity (1)stat.fit.goodnessfloatInstInstrument (Gemini North or Gemini South)meta.id;instrchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/471/4218/table2Orbital parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSNameSDSS short name (JHHMM+DDMM)meta.idcharPerPerioddtime.perioddoublee_PerPeriod errordstat.errordoubleKVelocity semi-amplitude Kkm/sphys.velocfloate_KVelocity semi-amplitude K errorkm/sstat.errorfloatgammagamma velocitykm/sphys.veloc;pos.barycenterfloate_gammagamma velocity errorkm/sstat.errorfloatchi2redReduced chi^2^stat.fit.chi2floatfMass functionsolMassphys.massfloatM1Mass of the primarysolMassphys.massfloatl_M2[>= ] Limit flag on M2meta.code.errorcharM2Mass of the secondarysolMassphys.massfloatl_taumerge[<= ] Limit flag on taumergemeta.code.errorchartaumergeMerger times due to gravitational wave radiationtime.agefloatx_taumergeUnits of taumergemeta.unitcharVCShow the Radial Velocity curvesmeta.ref.urlcharTableName of the table with radial velocitiesmeta.id;meta.tablecharSDSSSDSS name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.mainJ/MNRAS/471/4218/tablea1J0834+3049 radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2457000)dtime.epochdoubleHVHelioentric velocity errorkm/sstat.error;phys.velocfloate_HVHelioentric velocity errorkm/sstat.errorfloatJ/MNRAS/471/4218/tablea2J1235+1543 radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2457000)dtime.epochdoubleHVHelioentric velocity errorkm/sstat.error;phys.velocfloate_HVHelioentric velocity errorkm/sstat.errorfloatJ/MNRAS/471/4218/tablea3J1237+4913 radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2457000)dtime.epochdoubleHVHelioentric velocity errorkm/sstat.error;phys.velocfloate_HVHelioentric velocity errorkm/sstat.errorfloatJ/MNRAS/471/4218/tablea4J2342+0811 radial velocitiesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJDHeliocentric Julian date (HJD-2457000)dtime.epochdoubleHVHelioentric velocity errorkm/sstat.error;phys.velocfloate_HVHelioentric velocity errorkm/sstat.errorfloat