J/MNRAS/488/2263ivo://CDS.VizieR/J/MNRAS/488/2263doi:10.26093/cds/vizier.74882263CDSBhavana D.Vig S.Ghosh S.K.Gorthi R.K.S.S.2024-08-20T20:11:59Z2023-02-03T14:18:38ZCDS support team

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

cds-question@unistra.frbrown-dwarfsinfrared-photometryastrometrystellar-spectral-typesastronomical-modelsThe application of machine learning principles in the photometric search of elusive astronomical objects has been a less-explored frontier of research. Here, we have used three methods, the neural network and two variants of k-nearest neighbour, to identify brown dwarf candidates using the photometric colours of known brown dwarfs. We initially check the efficiencies of these three classification techniques, both individually and collectively, on known objects. This is followed by their application to three regions in the sky, namely Hercules (2{deg}x2{deg}), Serpens (9{deg}x4{deg}), and Lyra (2{deg}x2{deg}). Testing these algorithms on sets of objects that include known brown dwarfs show a high level of completeness. This includes the Hercules and Serpens regions where brown dwarfs have been detected. We use these methods to search and identify brown dwarf candidates towards the Lyra region. We infer that the collective method of classification, also known as ensemble classifier, is highly efficient in the identification of brown dwarf candidates.2019MNRAS.488.2263Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/488/2263CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006)II/311 : WISE All-Sky Data Release (Cutri+ 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/488/2263https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/488/2263http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/488/2263https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/488/2263https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/488/2263http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/488/2263GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/488/2263/table8 (Brown dwarf candidates identified by NeuN and ensemble classifier in Hercules)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/2263/table8?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/2263/table8?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/2263/table8?GETtext/xml+votable180.050000true268.792818.05550.005555555555555556Cone search capability for table J/MNRAS/488/2263/table9 (Brown dwarf candidates identified by NeuN and ensemble classifier in Lyra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/2263/table9?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/2263/table9?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/2263/table9?GETtext/xml+votable180.050000true274.548331.530.005555555555555556Cone search capability for table J/MNRAS/488/2263/table10 (Brown dwarf candidates identified by NeuN and ensemble classifier in Serpens)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/2263/table10?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/2263/table10?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/2263/table10?GETtext/xml+votable180.050000true247.32733.59320.005555555555555556Cone search capability for table J/MNRAS/488/2263/table11 (The Gaia associations and their properties of the brown dwarf candidates identified by NeuN and ensemble classifier in all three regions)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/488/2263/table11?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/488/2263/table11?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/488/2263/table11?GETtext/xml+votable180.050000true267.194116.99350.0055555555555555565/7872 7884 6/31147 31318-31319 31324 31327 31494 31496-31497 31499-31502 31514 31520 31522-31525 31527 31535 31540 31542 31545-31547 31549-31550 31632-31633 31635 31983 31992 31998 32336-32337 32625-32627 32633 32636https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/488/2263?format=asciiInfrareddefaultJ/MNRAS/488/2263/table8Brown dwarf candidates identified by NeuN and ensemble classifier in HerculesSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameWISE source name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTechTechnique used to identify the brown dwarf candidate (1)meta.id;stat.fitcharSNameSimbad association when foundmeta.idcharTypeStar categorysrc.classcharJ/MNRAS/488/2263/table9Brown dwarf candidates identified by NeuN and ensemble classifier in LyraSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameWISE source name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTechTechnique used to identify the brown dwarf candidate (1)meta.id;stat.fitcharSNameSimbad association when foundmeta.idcharTypeStar categorysrc.classcharJ/MNRAS/488/2263/table10Brown dwarf candidates identified by NeuN and ensemble classifier in SerpensSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameWISE source name (JHHMMSS.ss+DDMMSS.s)meta.id;meta.maincharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainTechTechnique used to identify the brown dwarf candidate (1)meta.id;stat.fitcharSNameSimbad association when foundmeta.idcharTypeStar categorysrc.classcharJ/MNRAS/488/2263/table11The Gaia associations and their properties of the brown dwarf candidates identified by NeuN and ensemble classifier in all three regionsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRegionSky region (Hercules, Lyra, Serpens)meta.notecharRAJ2000Right ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Declination (J2000)degpos.eq.dec;meta.mainGaiaDR2Gaia DR2 source identifiermeta.id;meta.mainplxParallaxmaspos.parallax.trigfloatDistDistancepcpos.distancedoublef_SpType[>] Flag on SpType (1)meta.codecharSpTypeSpectral typesrc.spTypecharPMProper motionmas/yrpos.pmdouble