J/A+A/696/A80ivo://CDS.VizieR/J/A+A/696/A80doi:10.26093/cds/vizier/bc-nr/liaCDSBouy H.Martin E.L.Cuillandre J.-C.Barrado D.Tamura M.Bertin E.M.,ZerjalPoints S.Olivares J.Huelamo N.Rodrigues T.2026-03-02T20:01:03Z2025-04-04T09:58:20ZCDS support team

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

cds-question@unistra.frlate-type-starsyoung-stellar-objectsphotometryinfrared-astronomyvisible-astronomySubstellar objects, including brown dwarfs and free-floating planetary-mass objects, are a significant product of star formation. Their sensitivity to initial conditions and early dynamical evolution makes them especially valuable for studying both planetary and stellar formation processes. We search for brown dwarfs and isolated planetary mass objects in a young star forming region to better constrain their formation mechanisms. We take advantage of Euclid unprecedented sensitivity, spatial resolution and wide-field of view to search for brown dwarfs and free-floating planetary mass objects in the LDN 1495 region of the Taurus molecular clouds. We combine the recent Euclid Early Release Observations with older very deep ground-based images obtained over more than 20 yr to derive proper motions and multi-wavelength photometry, and select members based on their morphology and their position in a proper motion diagram and in 9 color-magnitude diagrams. We identify 15 point sources with proper motions, colors, and luminosity consistent with being members of LDN 1495. Six of these objects were already known M9-L1 members. The remaining nine are newly identified sources that could have spectral types ranging from late-M to early-T with masses potentially as low as 1~2M_Jup_ based on their luminosity and according to evolutionary models. However, follow-up observations are needed to confirm their nature, spectral type and membership. If extrapolated to the entire Taurus star forming region, this result suggests the potential presence of several dozen free-floating planetary mass objects.2025A&A...696A..80Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/696/A80CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/463/1008 : LDN 1495 SCUBA-2 and Herschel data (Ward-Thompson+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/696/A80https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/696/A80http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/696/A80https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/696/A80https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/696/A80http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/696/A80GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/696/A80/table1 (Candidate members positions, proper motions and magnitudes)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/696/A80/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/696/A80/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/696/A80/table1?GETtext/xml+votable180.050000true64.5373928.060130.005555555555555556Cone search capability for table J/A+A/696/A80/tableb1 (Absolute magnitudes of known young or low-gravity ultra-cool objects)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/696/A80/tableb1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/696/A80/tableb1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/696/A80/tableb1?GETtext/xml+votable180.050000true56.4298425.673120.005555555555555556Cone search capability for table J/A+A/696/A80/taurus (Catalogue of sources in the the Euclid and ground based images)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/696/A80/taurus?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/696/A80/taurus?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/696/A80/taurus?GETtext/xml+votable180.050000true64.7064727.538710.0055555555555555566/250 290 483 496 580 749 840 872 1040 1075 1082-1083 1168-1169 1539 2044 4096 4116 4183 4269 4436 4536 5659 5840 5854 6406 6568 6783 6804 7033 7220 7440 8478 8544 8581 8727 8808 9385 9434 9483 9569 9588 9921 10114 10555 10654 10813 10823 11074 11138 11292 11662 11700 11834 13455 13874 13885 14127 14910 16434 16546 16692 16850 16867 16873 17007 17226 17352 17424 17594 17729 17814 18155 18166 18266 18281 18405 18594 18782 18789 18802 18840 18866 19016 19399 19598 19697 19726 19763 19776 19783 19813 20374 20591 20594 20996 21093 21100 21171 21296 21319 21435 21809 22300 22691 22937 22950 23321 23471 23501 23534 24566 24580-24582 24629 24632 24716 24869 25055 25097 25170 26196 26786 27074 27405 27518 27590 29354 29987 30833 30916 30919 31013 31296 31319 31336 31411 31594 31657 31863 32284 32402-32403 32554 34400 34645 34780 35063 35202 35387 35451 35518 35623 35630 35669 35906 35943 36198 36237 36418 36467 38054 38340 38369 38382 39185 39482 39485 39760 40200 40332 40403 40534 43197 43422 43475 43575 43977 44143 44310 44314 44603 46068 46376 46671 46729 47012 47418 47906 47979 48349 48455 48643 49036 490727.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/696/A80?format=asciiOpticalInfrareddefaultJ/A+A/696/A80/table1Candidate members positions, proper motions and magnitudesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObject name, JHHMMSS.ss+DDMMSS.smeta.id;meta.maincharRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainDEJ2000Declination (J2000.0)degpos.eq.dec;meta.maine_RAJ2000Error on right ascension (J2000.0)degstat.error;pos.eq.radoublee_DEJ2000Error on declination sign (J2000.0)degstat.error;pos.eq.decdoublepmRAProper motion in right ascensionmas/yrpos.pm;pos.eq.rafloatpmDEProper motion in declinationmas/yrpos.pm;pos.eq.decfloate_pmRAError on proper motion in right ascensionmas/yrstat.error;pos.pm;pos.eq.rafloate_pmDEError on proper motion in declinationmas/yrstat.error;pos.pm;pos.eq.decfloatrmag? r magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? Error on r magnitudemagstat.error;phot.magfloatnullableimag? i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? Error on i magnitudemagstat.error;phot.magfloatnullablezmagz magnitudemagphot.mag;em.opt.Ifloate_zmagError on z magnitudemagstat.error;phot.magfloatymagy magnitudemagphot.mag;em.opt.Vfloate_ymagError on y magnitudemagstat.error;phot.magfloatJmagJ magnitudemagphot.mag;em.IR.Jfloate_JmagError on J magnitudemagstat.error;phot.magfloatHmagH magnitudemagphot.mag;em.IR.Hfloate_HmagError on H magnitudemagstat.error;phot.magfloatKsmagKs magnitudemagphot.mag;em.IR.Kfloate_KsmagError on Ks magnitudemagstat.error;phot.magfloatIEmag? Euclid I_E magnitudemagphot.mag;em.optfloatnullablee_IEmag? Error on Euclid I_E magnitudemagstat.error;phot.magfloatnullableYEmagEuclid Y_E magnitudemagphot.mag;em.IR.Jfloate_YEmagError on Euclid Y_E magnitudemagstat.error;phot.magfloatJEmagEuclid J_E magnitudemagphot.mag;em.IR.Jfloate_JEmagError on Euclid J_E magnitudemagstat.error;phot.magfloatHEmagEuclid H_E magnitudemagphot.mag;em.IR.Hfloate_HEmagError on Euclid H_E magnitudemagstat.error;phot.magfloatNposOKNumber of epochsmeta.numberintEpochminEarliest epochyrtime.epochdoubleEpochmaxLast epochyrtime.epochdoubleSpreadModSExtractor SPREAD_MODELstat.fit.paramdoublee_SpreadModError on SExtractor SPREAD_MODELstat.errordoubleI1magSpitzer IRAC 1 magnitudemagphot.mag;em.IR.3-4umfloate_I1magError on Spitzer IRAC 1 magnitudemagstat.error;phot.magfloatI2magSpitzer IRAC 2 magnitudemagphot.mag;em.IR.4-8umfloate_I2magError on Spitzer IRAC 2 magnitudemagstat.error;phot.magfloatI3mag? Spitzer IRAC 3 magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_I3mag? Error on Spitzer IRAC 3 magnitudemagstat.error;phot.magfloatnullableI4mag? Spitzer IRAC 4 magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_I4mag? Error on Spitzer IRAC 4 magnitudemagstat.error;phot.magfloatnullableW1mag? unWISE 1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? Error on unWISE 1 magnitudemagstat.error;phot.magfloatnullableW2mag? unWISE 2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? Error on unWISE 2 magnitudemagstat.error;phot.magfloatnullableJ/A+A/696/A80/tableb1Absolute magnitudes of known young or low-gravity ultra-cool objectsDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainSpTypeSpectral typesrc.spTypecharzmag? z magnitudemagphot.mag;em.opt.IfloatnullableYEmag? Euclid Y_E magnitudemagphot.mag;em.IR.JfloatnullableSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSimbad mainmeta.id;meta.maincharRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainJEmagEuclid J_E magnitudemagphot.mag;em.IR.JfloatHEmagEuclid H_E magnitudemagphot.mag;em.IR.HfloatI1mag? Spitzer IRAC 1 magnitudemagphot.mag;em.IR.3-4umfloatnullableI2mag? Spitzer IRAC 2 magnitudemagphot.mag;em.IR.4-8umfloatnullableJ/A+A/696/A80/taurusCatalogue of sources in the the Euclid and ground based imagesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObjectObject name, JHHMMSS.ss+DDMMSS.smeta.id;meta.maincharRAJ2000Right ascension (J2000.0)degpos.eq.ra;meta.mainindexedDEJ2000Declination (J2000.0)degpos.eq.dec;meta.mainindexede_RAJ2000Error on right ascension (J2000.0)degstat.error;pos.eq.radoublee_DEJ2000Error on declination sign (J2000.0)degstat.error;pos.eq.decdoublepmRA? proper motion in ramas/yrpos.pm;pos.eq.radoublenullablepmDE? proper motion in decmas/yrpos.pm;pos.eq.decdoublenullablee_pmRA? Error on proper motion in ramas/yrstat.error;pos.pm;pos.eq.rafloatnullablee_pmDE? Error on proper motion in decmas/yrstat.error;pos.pm;pos.eq.decfloatnullableNposOKNumber of epochsmeta.numberintEpochminEarliest epochyrtime.epochdoubleindexedEpochmaxLast epochyrtime.epochdoubleSpreadMod? SExtractor SPREAD_MODELstat.fit.paramdoublenullablee_SpreadMod? Error on SExtractor SPREAD_MODELstat.errordoublenullablermag? r magnitudemagphot.mag;em.opt.Rfloatnullablee_rmag? Error on r magnitudemagstat.error;phot.magfloatnullableimag? i magnitudemagphot.mag;em.opt.Ifloatnullablee_imag? Error on i magnitudemagstat.error;phot.magfloatnullablezmag? z magnitudemagphot.mag;em.opt.Ifloatnullablee_zmag? Error on z magnitudemagstat.error;phot.magfloatnullableymag? y magnitudemagphot.mag;em.opt.Vfloatnullablee_ymag? Error on y magnitudemagstat.error;phot.magfloatnullableJmag? J magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Error on J magnitudemagstat.error;phot.magfloatnullableHmag? H magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Error on H magnitudemagstat.error;phot.magfloatnullableKsmag? Ks magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? Error on Ks magnitudemagstat.error;phot.magfloatnullableIEmag? Euclid I_E magnitudemagphot.mag;em.optfloatnullablee_IEmag? Error on Euclid I_E magnitudemagstat.error;phot.magfloatnullableYEmag? Euclid Y_E magnitudemagphot.mag;em.IR.Jfloatnullablee_YEmag? Error on Euclid Y_E magnitudemagstat.error;phot.magfloatnullableJEmag? Euclid J_E magnitudemagphot.mag;em.IR.Jfloatnullablee_JEmag? Error on Euclid J_E magnitudemagstat.error;phot.magfloatnullableHEmag? Euclid H_E magnitudemagphot.mag;em.IR.Hfloatnullablee_HEmag? Error on Euclid H_E magnitudemagstat.error;phot.magfloatnullableI1mag? Spitzer IRAC 1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_I1mag? Error on Spitzer IRAC 1 magnitudemagstat.error;phot.magfloatnullableI2mag? Spitzer IRAC 2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_I2mag? Error on Spitzer IRAC 2 magnitudemagstat.error;phot.magfloatnullableI3mag? Spitzer IRAC 3 magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_I3mag? Error on Spitzer IRAC 3 magnitudemagstat.error;phot.magfloatnullableI4mag? Spitzer IRAC 4 magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_I4mag? Error on Spitzer IRAC 4 magnitudemagstat.error;phot.magfloatnullableW1mag? unWISE 1 magnitudemagphot.mag;em.IR.3-4umfloatnullablee_W1mag? Error on unWISE 1 magnitudemagstat.error;phot.magfloatnullableW2mag? unWISE 2 magnitudemagphot.mag;em.IR.4-8umfloatnullablee_W2mag? Error on unWISE 2 magnitudemagstat.error;phot.magfloatnullable