J/PASP/132/J4401ivo://CDS.VizieR/J/PASP/132/J4401doi:10.26093/cds/vizier.61333401CDSAllers K.N.Liu M.C.2025-09-26T20:14:10Z2021-03-04T10:28:36ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryyoung-stellar-objectsWe present the design and implementation of a medium-band near-IR filter tailored for detecting low-mass stars and brown dwarfs from the summit of Maunakea. The W-band filter is centered at 1.45{mu}m with a bandpass width of 6%, designed to measure the depth of the H_2_O water absorption prominent in objects with spectral types of M6 and later. When combined with standard J and H photometry, the W-band filter is designed to determine spectral types to ~=1.4 subtypes for late-M and L dwarfs, largely independent of surface gravity and reddening. This filter's primary application is completing the census of young substellar objects in star-forming regions, using W-band selection to greatly reduce contamination by reddened background stars that impede broad-band imaging surveys. We deployed the filter on the UH 88 inch telescope to survey ~3 degree^2^ of the NGC 1333, IC 348, and {rho} Ophiuchus star-forming regions. Our spectroscopic followup of W-band selected candidates resulted in the confirmation of 48 ultracool dwarfs with a success rate of 89%, demonstrating the efficacy of this new filter and selection method.2020PASP..132j4401Ahttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/PASP/132/J4401CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/PASP/132/J4401https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/PASP/132/J4401http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/PASP/132/J4401https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/PASP/132/J4401https://vizier.iucaa.in/viz-bin/votable?-source=J/PASP/132/J4401http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/PASP/132/J4401GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/PASP/132/J4401/table3 (Observing log: W band imaging)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/132/J4401/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/132/J4401/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/132/J4401/table3?GETtext/xml+votable180.050000true246.944167-24.4272220.005555555555555556Cone search capability for table J/PASP/132/J4401/table4 (Photometry of observed brown dwarf candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/132/J4401/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/132/J4401/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/132/J4401/table4?GETtext/xml+votable180.050000true52.2559230.820750.005555555555555556Cone search capability for table J/PASP/132/J4401/table5 (IRTF/SpeX observing log)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/132/J4401/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/132/J4401/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/132/J4401/table5?GETtext/xml+votable180.050000true52.2661830.941560.005555555555555556Cone search capability for table J/PASP/132/J4401/table6 (Classification of candidate members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/PASP/132/J4401/table6?https://vizier.iucaa.in/viz-bin/conesearch/J/PASP/132/J4401/table6?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/PASP/132/J4401/table6?GETtext/xml+votable180.050000true52.295833331.310.0055555555555555565/10745 6/857 859-860 862 1538-1539 29234 42970-42971 42988-42989 429921.1019998519292435e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/PASP/132/J4401?format=asciiInfrareddefaultJ/PASP/132/J4401/table3Observing log: W band imagingrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainObs.dateObservation datetime.epoch;obsnullableseczAirmassobs.airMassfloatTintIntegration timemintime.epochfloatSeeingSeeingarcsecinstr.obsty.seeingfloatJ/PASP/132/J4401/table4Photometry of observed brown dwarf candidatesClusterCluster namemeta.id.parentcharObjectObject name (UHW JDDD.ddddd+DD.ddddd)meta.id;meta.maincharWmagW magnitude (lambda_center_=1.45um)magphot.flux.density;em.IR.Hfloate_Wmagrms uncertainty on Wmagmagstat.error;phot.magfloatJmagMKO? MKO J magnitudemagphot.mag;em.IR.Jfloatnullablee_JmagMKO? rms uncertainty on MKO J magnitudemagstat.errorfloatnullableHmagMKO? MKO H magnitudemagphot.mag;em.IR.Hfloatnullablee_HmagMKO? rms uncertainty on MKO H magnitudemagstat.errorfloatnullableJmagMASS? 2MASS J magnitudemagphot.mag;em.IR.Jfloatnullablee_JmagMASS? rms uncertainty on 2MASS J magnitudemagstat.errorfloatnullableHmagMASS? 2MASS H magnitudemagphot.mag;em.IR.Hfloatnullablee_HmagMASS? rms uncertainty on 2MASS H magnitudemagstat.errorfloatnullableQMKO? MKO reddening-insensitive index (1)phot.colorfloatnullablee_QMKO? rms uncertainty on MKO reddening-insensitive indexstat.errorfloatnullableQ2MASS? 2MASS reddening-insensitive index (1)phot.colorfloatnullablee_Q2MASS? rms uncertainty on 2MASS reddening-insensitive indexstat.errorfloatnullable_RAPosition from name (right ascension part)degpos.eq.ra;meta.main_DEPosition from name (declination part)degpos.eq.dec;meta.mainSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintJ/PASP/132/J4401/table5IRTF/SpeX observing logrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObject name (UHW JDDD.ddddd+DD.ddddd)meta.id;meta.maincharObs.dateUT observation datetime.epoch;obsnullableGratGrattingmeta.notecharSlitSlit (N.Nx15)arcsecmeta.notecharRResolutioninstr.paramintseczAirmassobs.airMassfloatNexptExposure time (NNxNNN.n)stime.duration;obs.exposurecharTintIntegration timestime.epochfloatS/NYMedian S/N of the spectrum within Y bandstat.snrintS/NJMedian S/N of the spectrum within J bandstat.snrintS/NHMedian S/N of the spectrum within H bandstat.snrintS/NKMedian S/N of the spectrum within K bandstat.snrint_RAPosition from name (right ascension part)degpos.eq.ra;meta.main_DEPosition from name (declination part)degpos.eq.dec;meta.mainJ/PASP/132/J4401/table6Classification of candidate memberse_pmRA? rms uncertainty on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE? Gaia DR2 proper motion along DEmas/yrpos.pm;pos.eq.decfloatnullablee_pmDE? rms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatnullable_RAPosition from name (right ascension part)degpos.eq.ra;meta.main_DEPosition from name (declination part)degpos.eq.dec;meta.mainAV? Absorption in V bandmagphot.magfloatnullablee_AV? rms uncertainty on absorption in V bandmagstat.errorfloatnullablen_AV[a] Not eon AV (2)meta.notecharGravity[VL-G INT-G FLD-G]meta.codecharSpTypeLSpectral type(s) from litteraturesrc.spTypecharr_SpTypeLReference(s) for spectra type (3)meta.ref;pos.framecharPlx? Gaia DR2 parallaxmaspos.parallaxfloatnullablee_Plx? rms uncertainty on Gaia DR2 parallaxmasstat.error;pos.parallaxfloatnullablepmRA? Gaia DR2 proper motion along RA, pmRA*cosDEmas/yrpos.pm;pos.eq.rafloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterCluster name (1)meta.id.parentcharObjectObject name (UHW JDDD.ddddd+DD.ddddd)meta.id;meta.maincharSpTypeSpectral typesrc.spTypechar