J/ApJ/812/167ivo://CDS.VizieR/J/ApJ/812/167doi:10.26093/cds/vizier.18120167CDSGianninas A.Kilic M.Brown W.R.Canton P.Kenyon S.J.2017-05-10T11:52:44Z2016-03-04T12:35:10ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsmultiple-starsradial-velocitystellar-distancestellar-massesWe present the discovery of 11 new double degenerate systems containing extremely low-mass white dwarfs (ELM WDs). Our radial velocity observations confirm that all of the targets have orbital periods <=1 day. We perform spectroscopic fits and provide a complete set of physical and binary parameters. We review and compare recent evolutionary calculations and estimate that the systematic uncertainty in our mass determinations due to differences in the evolutionary models is small (~0.01M_{sun}_). Five of the new systems will merge due to gravitational wave radiation within a Hubble time, bringing the total number of merger systems found in the ELM Survey to 38. We examine the ensemble properties of the current sample of ELM WD binaries, including the period distribution as a function of effective temperature, and the implications for the future evolution of these systems. We also revisit the empirical boundaries of instability strip of ELM WDs and identify new pulsating ELM WD candidates. Finally, we consider the kinematic properties of our sample of ELM WDs and estimate that a significant fraction of the WDs from the ELM Survey are members of the Galactic halo.2015ApJ...812..167Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/812/167CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)J/A+A/557/A19 : Mass & age of extreme low-mass white dwarfs (Althaus+, 2013)J/ApJ/769/66 : The ELM survey. V. White dwarf binaries (Brown+, 2013)J/MNRAS/413/1121 : SDSS WD-main sequence binaries. X (Rebassa-Mansergas+ 2011)J/ApJ/743/138 : Spectroscopic survey of bright WDs (Gianninas+, 2011)J/ApJ/731/17 : Low-mass stars in SDSS Stripe 82 (Becker+, 2011)J/ApJ/730/67 : Radial velocities of low-mass white dwarfs (Brown+, 2011)J/ApJ/723/1072 : The ELM survey. I. Low-mass white dwarfs (Brown+, 2010)J/ApJS/156/47 : DA WDs from the Palomar Green Survey (Liebert+, 2005)J/AJ/127/3034 : Proper-motion catalog combining USNO-B & SDSS (Munn+, 2004)http://www.sdss.org/ : SDSS home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/812/167https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/812/167http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/812/167https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/812/167https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/812/167http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/812/167GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/812/167/table1 (New extremely low-mass white dwarf (ELM WD) physical parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/812/167/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/812/167/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/812/167/table1?GETtext/xml+votable180.050000true47.079958351.66986670.005555555555555556Cone search capability for table J/ApJ/812/167/elmwd (Physical and orbital binary parameters for all the Extremely low-mass white dwarfs (ELM WDs))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/812/167/elmwd?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/812/167/elmwd?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/812/167/elmwd?GETtext/xml+votable180.050000true5.618540.5210.0055555555555555566/316 3127 4102 4134 4613 4673 4676 4774 4813 4855 4976 5446 5450 5653 5791 5948 6015 6306 6426 6633 6636 7185 7524 7772 7782 8257 8265 8346 8419 8427 8537 8784 8991 9270 9376 9447 9984 10606 11393 11604 12368 12596 13319 13552 16033 16973 17231 17551 17936 18096 18252 18770 18831 19109 19114 19800 21587 21900 21961 22518 25228 26170 27019 27475 27522 27698 27951 28054 28148 28162 28199 31435 317143.588997330618193e-19 4.653515163505597e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/812/167?format=asciiOpticaldefaultJ/ApJ/812/167/table1New extremely low-mass white dwarf (ELM WD) physical parametersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS abbreviated identifier (JHHMM+DDMM)meta.id;meta.maincharNvNumber of radial velocity measures for this starmeta.numberintnullableRAJ2000Hour of the Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainTeff[8380/12300] Effective temperature (1)Kphys.temperature.effectiveinte_Teff[130/250] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[4.9/7.2] Log surface gravity (1)log(cm.s**-2)phys.gravityfloate_log(g)[0.05/0.2] Uncertainty in log(g)log(cm.s**-2)stat.errorfloatMass[0.15/0.29] Estimated masssolMassphys.massfloate_Mass[0.01/0.03] Uncertainty in MasssolMassstat.error;phys.massfloatgmag[13.04/19.45] SDSS g band magnitudemagphot.mag;em.opt.Bfloate_gmag[0.01/0.03] Uncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatgMag[5.2/10.4] Absolute g band magnitudemagphys.magAbsfloate_gMag[0.2/0.6] Uncertainty in gMagmagstat.error;phot.magfloatDist[0.1/1.7] Distancekpcpos.distance;pos.heliocentricfloate_Dist[0.02/0.4] Uncertainty in Distkpcstat.errorfloattcool[0.1/3.7] Cooling timeGyrtime.agefloate_tcool[0.05/0.6] Uncertainty in tcoolGyrstat.errorfloatPer[0.1/0.9] Period as in table 5; column added by CDSdtime.period;meta.tabledoublee_Per[0/0.009] Per uncertaintydstat.errordoubleVPVelocity Plotmeta.ref.urlcharJ/ApJ/812/167/table6Radial velocity measurements for the new ELM WDsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSDSS abbreviated identifier (JHHMM+DDMM)meta.id;meta.maincharHJDHeliocentric Julian Date; HJD-2455000dtime.epochdoubleHRV[-324/403] Heliocentric radial velocitykm/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[4/83] Uncertainty in HRVkm/sstat.errorfloatJ/ApJ/812/167/elmwdPhysical and orbital binary parameters for all the Extremely low-mass white dwarfs (ELM WDs)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNindicates newly identified ELM WDmeta.ref.urlcharNameSDSS abbreviated identifier (JHHMM+DDMM)meta.id;meta.maincharprimaryf_Name[abc] Flag on SDSS (1)meta.codecharTeff[7890/34270] Effective temperatureKphys.temperature.effectiveinte_TeffUncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[4.8/7.8] Log surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)Uncertainty in log(g)log(cm.s**-2)stat.errorfloatMass[0.15/1.16] Estimated masssolMassphys.massfloate_Mass[0.009/0.03] Uncertainty in MasssolMassstat.error;phys.massfloatRad[0.01/0.28] Estimated radiussolRadphys.size.radiusfloate_Rad[0.001/0.06] Uncertainty in RadsolRadstat.errorfloatgmag[13/20.6] SDSS g band magnitudemagphot.mag;em.opt.Bfloate_gmag[0.008/0.7] Uncertainty in gmagmagstat.error;phot.mag;em.opt.BfloatgMag[4.5/11.3] Absolute g band magnitudemagphys.magAbsfloate_gMag[0.1/0.6] Uncertainty in gMagmagstat.error;phot.magfloatDist[0.1/9.2] Distancekpcpos.distance;pos.heliocentricfloate_Dist[0.01/1.9] Uncertainty in Distkpcstat.errorfloattcool[0.001/7.7] Cooling timeGyrtime.agefloate_tcool[0.001/2.4] Uncertainty in tcoolGyrstat.errorfloatPer[0.008/1.1]? Perioddtime.perioddoublenullablee_Per[0/0.2]? Uncertainty in Perdstat.errordoublenullablel_K[<=] Limit flag on Kmeta.code.errorK[24/617] Radial velocity amplitudekm/sspect.dopplerVelocfloate_K[0.5/9]? Uncertainty in Kkm/sstat.errorfloatnullableMF[0.005/1]? Mass functionsolMassphys.massfloatnullablee_MF[0.001/0.09]? Uncertainty in MFsolMassstat.errorfloatnullablel_M2[~<=>] Limit flag on M2meta.code.errorM2[0.07/1.3]? Secondary masssolMassphys.massfloatnullablee_M2[0.01/0.2]? Uncertainty in M2solMassstat.errorfloatnullableM2i60[0.09/1.8]? Secondary mass assuming i=60 degsolMassphys.massfloatnullablee_M2i60[0.01/0.2]? Uncertainty in M2i60solMassstat.errorfloatnullablef_M2i60[a] Flag on M2i60 (1)meta.codecharl_tau[<=] Limit flag on taumeta.code.errortau[0.001/13.3]? Merge time scaleGyrtime.scalefloatnullableSep[0.1/4.2]? Binary separationsolRadpos.angDistancefloatnullablee_Sep[0.01/0.5]? Uncertainty in SepsolRadstat.errorfloatnullablelog(h)[-24.2/-21.5]? Log gravitational wave strainsrc.var.amplitudefloatnullablepPapDisplay data from paper I and V (Brown+, 2010, J/ApJ/723/1072 and 2013, J/ApJ/769/66)meta.ref.urlintnullableSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.main