J/PASP/130/H4203ivo://CDS.VizieR/J/PASP/130/H4203doi:10.26093/cds/vizier.61313203CDSKong X.Luo A.-L.Li X.-R.Wang Y.-F.Li Y.-B.Zhao J.-K.2025-09-09T14:14:52Z2020-10-12T14:31:59ZCDS support team

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

cds-question@unistra.frwhite-dwarf-starsradial-velocityeffective-temperatureultraviolet-photometryUsing a machine learning (ML) method, we mine DB white dwarfs (DBWDs) from the Sloan Digital Sky Survey (SDSS) Data Release (DR) 12 and DR14. The ML method consists of two parts: feature extraction and classification. The least absolute shrinkage and selection operator (LASSO) is used for the spectral feature extraction by comparing high quality data of a positive sample group with negative sample groups. In both the training and testing sets, the positive sample group is composed of a selection of 300 known DBWDs, while the negative sample groups are obtained from all types of SDSS spectra. In the space of the LASSO detected features, a support vector machine is then employed to build classifiers that are used to separate the DBWDs from the non-DBWDs for each individual type. Depending on the classifiers, the DBWD candidates are selected from the entire SDSS data set. After visual inspection, 2808 spectra (2029 objects) are spectroscopically confirmed. By checking the samples with the literature, there are 58 objects with 60 spectra that are newly identified, including a newly discovered AM CVn. Finally, we measure their effective temperatures (T_eff_), surface gravities (log g), and radial velocities, before compiling them into a catalog.2018PASP..130h4203Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/130/H4203CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-tohttps://http://skyserver.sdss.org/DR12 : SDSS DR12 Home Pagehttps://http://skyserver.sdss.org/DR14 : SDSS DR14 Home Pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/130/H4203https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/130/H4203http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/130/H4203https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/130/H4203https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/130/H4203http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/130/H4203GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/130/H4203/table6 (Newly spectroscopically confirmed DBWDs from SDSS DR12 and DR14)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/130/H4203/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/130/H4203/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/130/H4203/table6?GETtext/xml+votable180.050000true176.96554170.28363890.0055555555555555565/2821 6/0-1 29 54 321 546 550 555 671 697 701 725 727 736 745 902 904 908-910 971 998 1012 1698 1701 2010 2033 2063 2067 2074 2092 2180-2181 2203-2204 2210 2229 2298-2300 2303 3965 3967 4097 4100 4104 4112 4121 4126 4129-4130 4135-4136 4143-4144 4150 4156 4165 4168 4172 4174-4175 4178-4180 4182 4186 4189 4193 4195 4202-4203 4206-4207 4211 4223-4225 4228-4229 4231 4236 4238 4241-4242 4252-4254 4257-4258 4262 4271 4273 4283 4289 4291 4295 4297-4298 4301-4302 4312 4327 4330 4344 4353 4357 4385 4397 4407 4417 4435 4441 4450 4453 4467 4476 4484 4497 4500 4518 4524 4527-4528 4530 4534 4539-4540 4543-4544 4546 4555 4557 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27805 27816 27818 27834 27881-27882 27886 27896 27909 27915 27932 27939 27954-27955 27962 27968 27972 27976 27984 27993 28002 28012 28019 28036 28044 28047 28052-28053 28065 28067 28073 28079 28089 28093 28096 28098 28112 28116 28124 28127 28137 28142 28152 28164 28174 28184 28189-28190 28193 28198 28208-28209 28221 28227 28246 28263 28302 28306 28322 28331 28336 28339 28354 28361 28384 28400 28408 28415 28427 28434 28437 28439 28442 28453 28455-28456 28459 28462 28466 28477 28483 28514 28526 28533 28551 28558 28564 28568 28572-28573 28582 28595 28602 28612 28616 28622 28630 28633 28637 28643 28650 28653 28668 30036 30039 30043 30069 31138 31145 31291 31317 31324 31342 31346 31358 31394-31396 31400 31406 31408 31414-31415 31424 31429 31444 31447 31455 31466 31480 31485 31530-31531 31548 31616 31619 31628 31630 31641 31650 31657 31667-31668 31670 31675-31676 31689 31694 31723 31728 31734 31737-31738 31742-31743 31883 32396 32399 32402 32410 32413 32415 32421 32425 32427 32434 32440 32473 32486 32502 32508-32509 32519 32530 32538 32554 32682-32683 32686 32698-32699 36717 36725 36729 36731 36773 36781 36783 36786-36788 36795 36798 36801 36803 36840 36843 36856 36861-36863 40959 45046 45050 45055 48882 48888 48890 48892 49010 49015 49017 49019-49020 49081 49087 49095 49107 49121-49122 49130 491497.447298006782415e-19 1.4134638842407062e-18https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/130/H4203?format=asciiUVdefaultJ/PASP/130/H4203/table6Newly spectroscopically confirmed DBWDs from SDSS DR12 and DR14recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSDSSSDSS object name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharP-M-FSDSS Plate number-Modified Julian date-Fibermeta.idcharTypeClassification of objects derived from ML methodsrc.classcharRVDBRadial velocity of each spectrumkm/sphys.veloc;pos.heliocentricinte_RVDBRadial velocity uncertainty of each spectrumkm/sstat.errorintRVM? Radial velocity of M companionskm/sphys.veloc;pos.heliocentricintnullablee_RVM? Radial velocity uncertainty of M companionskm/sstat.errorintnullableTeff? Effective temperatureKphys.temperature.effectiveintnullablee_Teff? Effective temperatureKstat.error;phys.temperature.effectiveintnullablelogg? Surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg? Surface gravitylog(cm.s**-2)stat.errorfloatnullableFUV? Magnitude of FUV from GALEXmagphot.mag;em.UV.100-200nmfloatnullablee_FUV? Magnitude uncertainty of FUV from GALEXmagstat.errorfloatnullableNUV? Magnitude of NUV from GALEXmagphot.mag;em.UVfloatnullablee_NUV? Magnitude uncertainty of NUV from GALEXmagstat.errorfloatnullableS/NMedian S/N from catalog of SDSS DR14stat.snrfloatMass? Obtained from Bergeron & Gilles Fontaine (2016) (1)solMassphys.massfloatnullableAge? Obtained from Bergeron & Gilles Fontaine (2016) (1)Myrtime.agefloatnullableRefID of the literature (2)meta.bibcharSloanDisplay the online SDSS data for this objectmeta.ref.urlchar_RARight ascension (derived from SDSS) for Eq=J2000degpos.eq.ra;meta.main_DEDeclination (derived from SDSS) for Eq=J2000degpos.eq.dec;meta.main