J/ApJ/950/141ivo://CDS.VizieR/J/ApJ/950/141CDSKosakowski A.Brown W.R.Kilic M.Kupfer T.Bedard A.Gianninas A.,Agueros M.A.Barrientos M.2025-10-01T06:29:29Z2025-09-05T10:16:02ZCDS support team

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

cds-question@unistra.freclipsing-binary-starswhite-dwarf-starsvisible-astronomyspectroscopyradial-velocitystellar-massestrigonometric-parallaxsurveysWe present the results from our ongoing spectroscopic survey targeting low-mass white dwarf binaries, focusing on the southern sky. We used a Gaia DR2- and eDR3-based selection and identified 28 new binaries, including 19 new extremely low-mass (ELM) white dwarfs, one short period, likely eclipsing, DABZ, and two potential LISA binaries. We present the orbital and atmospheric parameters for each new binary based on our spectroscopic follow up. Four of our new binaries show periodic photometric variability in TESS 2 minutes cadence data, including one new eclipsing double-lined spectroscopic binary. Three others show periodic photometric variability in ZTF, including one new eclipsing binary. We provide estimates for the inclinations and scaled component radii for these ZTF variables, based on light-curve modeling of our high-speed photometric follow-up observations. Our observations have increased the sample of ELM Survey binaries identified in the southern sky to 41, an increase of 64%. Future time domain surveys, such as BlackGEM and the Vera C. Rubin Observatory Legacy Survey of Space and Time, will efficiently identify photometric variables in the southern sky and significantly increase the population of southern sky low-mass white dwarf binaries, leading to a more complete all-sky population of these systems.2023ApJ...950..141Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/950/141CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/345 : Gaia DR2 (Gaia Collaboration, 2018)I/350 : Gaia EDR3 (Gaia Collaboration, 2020)I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022)II/385 : VLT Survey Telescope ATLAS DR4 (Shanks+, 2025)J/ApJS/156/47 : DA WDs from the Palomar Green Survey (Liebert+, 2005)J/ApJ/723/1072 : The ELM survey. I. Low-mass white dwarfs (Brown+, 2010)J/ApJ/743/138 : Sp. survey of bright white dwarfs (Gianninas+, 2011)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/A+A/557/A119 : Eclipsing binary system LL Aquarii (Southworth, 2013)J/ApJ/794/35 : Binary WDs atmospheric parameters (Gianninas+, 2014)J/ApJ/812/167 : The ELM survey. VI. 11 new ELM WD bin. (Gianninas+, 2015)J/ApJ/818/155 : The ELM survey. VII. 15 new ELM WD candidates (Brown+, 2016)J/A+A/595/A35 : Low-mass helium WDs evolutionary models (Istrate+, 2016)J/ApJ/848/11 : Spectroscopic & photometric analysis of WDs (Bedard+, 2017)J/AJ/156/102 : The TESS Input Cat. & Candidate Target List (Stassun+, 2018)J/MNRAS/488/2892 : Gaia DR2 extremely low-mass WD candidates (Pelisoli+, 2019)J/ApJ/901/93 : Model atm. analysis of hot WDs from SDSSDR12 (Bedard+, 2020)J/ApJ/889/49 : The ELM Survey. VIII. Final double WD bin. (Brown+, 2020)J/A+A/634/A93 : Limb-darkening coeff. for compact stars (Claret+, 2020)J/ApJ/894/53 : ELM Survey South. I. 6 new ELM WDs RVs (Kosakowski+, 2020)J/A+A/650/A102 : SDSS J160429.12+100002.2 spectra (Irrgang+, 2021)J/ApJ/933/94 : The ELM survey. IX. SDSS+Gaia WD binaries (Brown+, 2022)J/ApJ/936/5 : LAMOST parameters for 188 white dwarfs (Wang+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/950/141https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/950/141http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/950/141https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/950/141https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/950/141http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/950/141GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/950/141/wdbin (White dwarf parameters determined through optical spectroscopy for the 28 new binaries identified in this work (Table 1) and orbital solutions (Table 2))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/950/141/wdbin?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/950/141/wdbin?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/950/141/wdbin?GETtext/xml+votable180.050000true23.753596423.99616780.005555555555555556Cone search capability for table J/ApJ/950/141/tablea2 (Atmospheric parameters (assuming pure-hydrogen atmospheres) for objects observed as part of our follow-up campaign)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/950/141/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/950/141/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/950/141/tablea2?GETtext/xml+votable180.050000true0.777953340.65762560.0055555555555555566/44 128 496 541 567 655 743 822 935 1181 1362 1684 2072 2109 2241 2268 2274 2293 2354 2467 2652 2660 2682 2704 2986 3080 3414 3777 4140 4299 4342 4382 4536 4641 4709 4722 4752 4772 4866 5030 5038 5107 5583 5643 5808 6117 6399 6597 6703 6876 6957 7033-7034 7108 7173 7446 7555 7616 7830 7861 7865 7982 8109 8144 8325 8425 8458 8596 9041 9169 9492 9506 9586 10001 10009 10028 10095 10137 10281 11279 11393 11536 11696-11697 12120 12209 12327 12404 12490 12537 12571 12575 12622 12768 12791 12877 13124 13280 13369 13403 13448 13476 13726 15033 15082 15090 15251 15767 16003 16434 16928 16965 17132 17399 17527 17558 17641 17717 17782 17859 18008 18068 18124 18213 18330 18539 18575 18621 18663 18712 18757 18875 18890 18905 18926-18927 18992 19037 19210 19448 19452 19462 19670 19730 19791 19883 19896 19959 20078 20291 20320 20347 20374 20422 20439 20477 20639 21038 21067 21081 21115 21173 21238 21314 21560 21770 21814 21839 21873 21958-21959 22002 22190 22461 22492 22518 22632 22768 22817 22917 22924 22946 23106 23168 23182 23811 23823 24176 24761 24877 24940 25051 25428 25761 25804 25836 25870 26125 26471 26495 26584 26660 26677 26705 26772 26837 26885 26976 27011 27025 27090 27327 27468 27566 27656 27681 28514 30794 30955 31019 31621 31660 31772 32043 32158 32298 32459 32549 32565-32566 32698 32739 33265 33503 33688 33710 34143 34208 34260 34325 34418 34523 34728 34866 35191 35226 35305 36267 36336 36452 36460 36484 36500 36516 36923 38851 38855 39008 40426 42075 43497 43751 44008 44068 44123 44150 44171 44360 44482 44629 44717 44781 44855 44907 44932 45009 45038 45321 45328 45381 45600 45665 45811 45888 46042 46195 46266 46325 46351 46384 46661 46753 46762 47152 47217 47256 47260 47267 47443 47921 48226 48356 48419 48430 48477 48517 48680 48777 48793 48847 48882 49059 491161.9867573869263685e-19 3.916500758235022e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/950/141?format=asciiOpticaldefaultJ/ApJ/950/141/wdbinWhite dwarf parameters determined through optical spectroscopy for the 28 new binaries identified in this work (Table 1) and orbital solutions (Table 2)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject identifiermeta.id;meta.maincharprimaryFlagFlag (s) (G1)meta.code.errorcharRA_ICRSHour of Right Ascension (ICRS) at Epoch=2016.0pos.eq.raDE_ICRSDegree of Declination (ICRS) at Epoch=2016.0pos.eq.decTeff[8740/22850] Stellar effective temperatureKphys.temperature.effectiveinte_Teff[130/500] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlogg[5.24/7.5] Log, surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.04/0.3] Uncertainty in logglog(cm.s**-2)stat.error;phys.gravityfloatMstar[0.18/0.43]? Stellar masssolMassphys.massfloatnullablee_Mstar[0.01/0.04]? Uncertainty in MstarsolMassstat.error;phys.massfloatnullableGmag[13.8/19]? Gaia DR3 G-band magnitudemagphot.mag;em.optfloatnullableplx[0.5/6.1] Gaia DR3 parallaxmaspos.parallax.trigfloate_plx[0.02/0.3] Uncertainty in plxmasstat.error;pos.parallaxfloatPer[0.027/1.2] Orbital Perioddtime.perioddoublee_Per[1e-06/0.01] Uncertainty in Perdstat.error;time.perioddoubleK[79/514] Velocity semi-amplitudekm/sphys.velocfloatE_K[8]? Upper uncertainty on Kkm/sstat.error;stat.max;phys.velocintnullablee_K[1/9.5] Lower (or symmetric) uncertainty on Kkm/sstat.error;stat.min;phys.velocfloatgamma[-140/147]? Systemic velocitykm/sphys.velocfloatnullableE_gamma[6/7.1]? Upper uncertainty on Kkm/sstat.error;stat.max;phys.velocfloatnullablee_gamma[1/29.5]? Lower (or symmetric) uncertainty on Kkm/sstat.error;stat.min;phys.velocfloatnullablel_M2Limit flag on M2meta.code.errorcharM2[0.1/1.1]? Companion masssolMassphys.massfloatnullableE_M2[0.05/0.05]? Upper uncertainty on M2solMassstat.error;stat.max;phys.massfloatnullablee_M2[0.01/0.1]? Lower (or symmetric) uncertainty on M2solMassstat.error;stat.min;phys.massfloatnullablel_taumLimit flag on taummeta.code.errorchartaum[0.021/371.4]? Merger timescaleGyrtime.scalefloatnullablee_taum[0.001/71.7]? Uncertainty in taumGyrstat.error;time.scalefloatnullableDisk[0/1] Galactic disk (flag=1) or halo membershipmeta.code.memberintNrvNumber of RV measurements for this object (link to Table A1)meta.numberintnullableVPVelocity Plotmeta.ref.urlcharGaiaDisplay data from Gaia DR3 (I/355)meta.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.mainSimbadNameSimbad column added by the CDSmeta.idcharnullableJ/ApJ/950/141/tablea1Radial velocity measurements for the 28 new binaries identified in this workNameObject identifiermeta.id;meta.maincharRVel[-498/493] Radial Velocitykm/sspect.dopplerVelocdoublee_RVel[1.3/113] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocdoublerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHJD[3852.76/9935.72] Heliocentric Julian date; HJD-2450000.0dtime.epochdoubleJ/ApJ/950/141/tablea2Atmospheric parameters (assuming pure-hydrogen atmospheres) for objects observed as part of our follow-up campaignrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGaiaGaia DR3 identifier (source_id)meta.id;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharFlagFlag(s) (G1)meta.code.errorcharRA_ICRSHour of Right Ascension (ICRS) at Epoch=2016.0pos.eq.raDE_ICRSDegree of Declination (ICRS) at Epoch=2016.0pos.eq.decTeff[9290/45500] Stellar effective temperatureKphys.temperature.effectiveinte_Teff[140/5070] Uncertainty in TeffKstat.error;phys.temperature.effectiveintlogg[4.9/8.4] Log, surface gravitylog(cm.s**-2)phys.gravityfloate_logg[0.04/0.9] Uncertainty in logglog(cm.s**-2)stat.errorfloatGmag[13.2/20]? Gaia DR3 G-band magnitudemagphot.mag;em.optfloatnullableBP-RP[-0.51/0.55] Gaia DR3 BP-RP colormagphot.color;em.opt.B;em.opt.Rfloate_BP-RP[0.004/0.05] Uncertainty in BP-RPmagstat.error;phot.color;em.optfloatplx[0.5/25.6] Gaia DR3 parallaxmaspos.parallax.trigfloate_plx[0.03/0.5] Uncertainty in plxmasstat.error;pos.parallaxfloat_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.main