J/ApJ/818/155ivo://CDS.VizieR/J/ApJ/818/155doi:10.26093/cds/vizier.18180155CDSBrown W.R.Gianninas A.Kilic M.Kenyon S.J.Allende Prieto C.2017-10-16T10:58:00Z2016-05-30T15:09:20ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsradial-velocityvisible-astronomysloan-photometryspectroscopic-binary-starsstellar-distancestellar-massesWe present the discovery of 15 extremely low-mass (5<logg<7) white dwarf (WD) candidates, 9 of which are in ultra-compact double-degenerate binaries. Our targeted extremely low-mass Survey sample now includes 76 binaries. The sample has a lognormal distribution of orbital periods with a median period of 5.4hr. The velocity amplitudes imply that the binary companions have a normal distribution of mass with 0.76 M_{sun}_ mean and 0.25M_{sun}_ dispersion. Thus extremely low-mass WDs are found in binaries with a typical mass ratio of 1:4. Statistically speaking, 95% of the WD binaries have a total mass below the Chandrasekhar mass, and thus are not type Ia supernova progenitors. Yet half of the observed binaries will merge in less than 6Gyr due to gravitational wave radiation; probable outcomes include single massive WDs and stable mass transfer AM CVn binaries.2016ApJ...818..155Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/818/155CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)J/ApJ/812/167 : The ELM survey. VI. 11 new ELM WD binaries (Gianninas+, 2015)J/AJ/150/97 : RVs in M67. I. 1278 candidate members (Geller+, 2015)J/ApJS/218/23 : Fermi LAT third source catalog (3FGL) (Acero+, 2015)J/A+A/576/A44 : Hot subdwarf binaries from MUCHFUSS (Kupfer+, 2015)J/MNRAS/446/4078 : New white dwarf stars in SDSS DR10 (Kepler+, 2015)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/ApJS/204/5 : SDSS DR7 white dwarf catalog (Kleinman+, 2013)J/ApJ/751/55 : MMT hypervelocity star survey. II. (Brown+, 2012)J/ApJ/743/138 : Spectroscopic survey of bright WDs (Gianninas+, 2011)J/A+A/536/A43 : SDSS WD main-sequence bin. XII. (Nebot Gomez-Moran+, 2011)J/ApJ/723/1072 : The ELM survey. I. Low-mass white dwarfs (Brown+, 2010)J/A+A/513/L7 : Post common envelope bin. from SDSS. VIII (Schreiber+, 2010)J/MNRAS/402/620 : SDSS WD main-sequence binaries (Rebassa-Mansergas+, 2010)J/AJ/135/564 : Photometry and spectroscopy of BHB candidates (Brown+, 2008)J/ApJS/167/40 : SDSS4 confirmed white dwarfs catalog (Eisenstein+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/818/155https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/818/155http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/818/155https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/818/155https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/818/155http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/818/155GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/818/155/table5 (Entire ELM survey)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/818/155/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/818/155/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/818/155/table5?GETtext/xml+votable180.050000true5.618550.520986110.0055555555555555566/316 3127 4102 4134 4613 4673 4676 4774 4813 4855 4976 5446 5450 5653 5791 5948 6015 6306 6426 6633 6636 7185 7524 7555 7772 7782 8257 8265 8346 8404 8419 8427 8537 8665 8784 8858 8991 9270 9376 9447 9984 10606 11393 11604 12368 12596 12747 13319 13552 16033 16973 17231 17551 17936 18096 18252 18770 18831 19109 19114 19799 19800 20216 21587 21590 21900 21961 22518 25228 26170 26360 27019 27475 27522 27573 27637 27698 27814 27951 28054 28148 28162 28199 28256 31435 31537 31714 32377https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/818/155?format=asciiOpticaldefaultJ/ApJ/818/155/table5Entire ELM surveySimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNew[n] n: new candidate (1)meta.codecharNameObject identifier (JHHMM+DDMM)meta.id;meta.maincharprimaryRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainTeff[7940/34270] Effective temperatureKphys.temperature.effectiveinte_Teff[120/500] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlog(g)[4.7/7.8] Log surface gravitylog(cm.s**-2)phys.gravityfloate_log(g)[0.04/0.2] Uncertainty in log(g)log(cm.s**-2)stat.errorfloatMass[0.1/0.5] Estimated ELM white dwarf masssolMassphys.massfloatgMag[4.5/11.2] Absolute g band magnitudemagphys.magAbsfloate_gMag[0.07/0.5] Uncertainty in gMagmagstat.error;phot.magfloatg0mag[13/20.6] Dereddened apparent g-band magnitude from SDSSmagphot.mag;em.opt.Bfloate_g0mag[0/0.04] Uncertainty in g0magmagstat.error;phot.magfloatDist[0.1/9.2] Heliocentric distancekpcpos.distancefloate_Dist[0.005/1.7] Uncertainty in Distkpcstat.errorfloatPer[0.008/2.2]? Orbital perioddtime.perioddoublenullablee_Per[0/0.2]? Uncertainty in Perdstat.errordoublenullablel_KLimit flag on Kmeta.code.errorcharK[14/617] Semi-amplitudekm/ssrc.var.amplitudefloate_K[0.5/9]? Uncertainty in Kkm/sstat.errorfloatnullablegamma[-202/126] Systemic velocitykm/sphys.veloc;pos.heliocentricfloate_gamma[0.8/9] Uncertainty in gammakm/sstat.errorfloatM2[0.07/1.3]? Minimum secondary masssolMassphys.mass;stat.minfloatnullabletau[0.001/12353]? Maximum gravitational wave merger timeGyrtime.epoch;stat.maxdoublenullableNvmeta.numberintnullableCmeta.ref.urlintnullablepPapDisplay data from previous papers I, V and VI (Brown+, 2010, J/ApJ/723/1072 and 2013, J/ApJ/769/66 and Gianninas+, 2013, J/ApJ/812/167)meta.ref.urlintnullableDR9Display the SDSS-DR9 photometric data within 2"meta.ref.urlcharVPInteractive plot of radial velocitiesmeta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharJ/ApJ/818/155/table3Clean extremely low-mass (ELM) white dwarf binariesPer[0.008/1.1] Orbital perioddtime.perioddoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameWhite dwarf identifier (JHHMM+DDMM)meta.id;meta.mainchare_Per[0/0.06] Per uncertaintydstat.errordoubleK[78.9/617] Semi-amplitudekm/ssrc.var.amplitudefloate_K[0.5/9] K uncertaintykm/sstat.errorfloatM1[0.1/0.4] ELM white dwarf masssolMassphys.massfloate_M1[0.01/0.03] M1 uncertaintysolMassstat.errorfloatM1/M2[0.1/1.2] M1 to secondary mass ratiophys.massfloate_M1/M2[0/0.8] Negative uncertainty on M1/M2stat.errorfloatE_M1/M2[0/0.3] Positive uncertainty on M1/M2stat.error;stat.maxfloatMtot[0.3/1.5] Total masssolMassphys.massfloate_Mtot[0.01/0.3] Negative uncertainty on MtotsolMassstat.errorfloatE_Mtot[0.01/0.4] Positive uncertainty on MtotsolMassstat.error;stat.maxfloattau[0.001/367] Merger timeGyrtime.epochfloate_tau[0.0001/66] Negative uncertainty on tauGyrstat.errorfloatE_tau[0.0001/91] Positive uncertainty on tauGyrstat.error;stat.maxfloatJ/ApJ/818/155/table4Radial velocity measurementsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject identifier (JHHMM+DDMM)meta.id;meta.maincharHJDHeliocentric Julian Datedtime.epochdoubleHRV[-475/396] Heliocentric radial velocity (1)km/sspect.dopplerVeloc;pos.heliocentricfloate_HRV[3/48] Uncertainty in HRVkm/sstat.errorfloat