J/MNRAS/481/3548ivo://CDS.VizieR/J/MNRAS/481/3548doi:10.26093/cds/vizier.74813548CDSSmart R.L.Bucciarelli B.Jones H.R.A.Marocco F.Andrei A.H.,Goldman B.Mendez R.A.d'Avila V.A.Burningham B.Camargo J.I.B.,Crosta M.T.Dapra M.Jenkins J.S.Lachaume R.Lattanzi M.G.,Penna J.L.Pinfield D.J.da Silva Neto D.N.Sozzetti A.Vecchiato A.2024-08-18T20:21:50Z2022-07-07T14:00:29ZCDS support team

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

cds-question@unistra.frvisible-astronomytrigonometric-parallaxproper-motionsbrown-dwarfsWe present new results from the Parallaxes of Southern Extremely Cool dwarfs program to measure parallaxes, proper motions and multiepoch photometry of L and early T dwarfs. The observations were made on 108 nights over the course of 8yr using the Wide Field Imager on the ESO 2.2m telescope. We present 118 new parallaxes of L and T dwarfs of which 52 have no published values and 24 of the 66 published values are preliminary estimates from this program. The parallax precision varies from 1.0 to 15.5mas with a median of 3.8mas. We find evidence for two objects with long term photometric variation and 24 new moving group candidates. We cross-match our sample to published photometric catalogues and find standard magnitudes in up to 16 pass-bands from which we build spectral energy distributions and H-R diagrams. This allows us to confirm the theoretically anticipated minimum in radius between stars and brown dwarfs across the hydrogen burning minimum mass. We find the minimum occurs between L2 and L6 and verify the predicted steep dependence of radius in the hydrogen burning regime and the gentle rise into the degenerate brown dwarf regime. We find a relatively young age of ~2Gyr from the kinematics of our sample.2018MNRAS.481.3548Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/481/3548CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/481/3548https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/481/3548http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/481/3548https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/481/3548https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/481/3548http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/481/3548GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/481/3548/table2 (Astrometric parameters of PARSEC targets)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/481/3548/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/481/3548/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/481/3548/table2?GETtext/xml+votable180.050000true1.1477475-40.73929750.0055555555555555566/16609 16778 17075 17096 17137 17530 17594 17930 18019 18683 18717 18840 20897 20993 21209 21296 21835 22759 22861 23056 24632 24694 25015 25223 25266 25314 25853 26210 26754 27019 29987 30749 30764 30919 30956 31009 31011 31062 31144 31268 33767 34400 34780 34893 35020 35106 35387 35495 35499 35630 35902 35906 36223 36418 36458 36467 36560 36602 36772 36784 36919 37007 37390 38176 38340 38363 38786 38812 39109 39482 39485 40191 40332 40375 40669 40882 40901 41012 41984 42635 43475 43773 43856 43875 43977 44118 44284 44314 44416 44486 44807 44929 44954 45178 45564 45566 45777 45834 45952 46068 46103 46671 46961 47030 47192 47249 47357 47640 48171 48234 48300 48455 48593 48611 48817 48957 48990 49139https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/481/3548?format=asciiOpticaldefaultJ/MNRAS/481/3548/table1Targets, published magnitudes, spectral types, radial velocities, and parallaxesSimbadNameSimbad column added by the CDSmeta.idcharnullabler_plx? Reference for plx, in refs.dat filemeta.ref;pos.frameintnullableMultPublished indications of multiplicity (1)meta.code.multipcharr_MultReference for Mult, in refs.dat filemeta.ref;pos.framecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDShort name for each objectmeta.id;meta.maincharNameDiscovery Name of the sourcemeta.idcharr_NameReference for Name, in refs.dat filemeta.ref;pos.frameintzmagz-band magnitudemagphot.mag;em.opt.IfloatSpTypeOp? Optical spectral typesrc.spTypecharr_SpTypeOp? Reference for SpTypeOp, in refs.dat filemeta.ref;pos.frameintnullableSpTypeNIR? NIR spectral typesrc.spTypecharr_SpTypeNIR? Reference for SpTypeNIR, in refs.dat filemeta.ref;pos.frameintnullableRV? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RV? Error on RVkm/sstat.errorfloatnullabler_RV? Reference for RV, in refs.dat filemeta.ref;pos.framecharplx? Parallaxmaspos.parallax.trigfloatnullablee_plx? Error on plxmasstat.error;pos.parallaxfloatnullableJ/MNRAS/481/3548/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference numbermeta.id;meta.mainintBibCodeBibcodemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentsmeta.notecharJ/MNRAS/481/3548/table2Astrometric parameters of PARSEC targetsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRARight ascension (ICRS) at Ep=2010degpos.eq.ra;meta.mainDEDeclination (ICRS) at Ep=2010degpos.eq.dec;meta.mainEpochEpoch of base frameyrtime.epochfloatplxParallax (1)maspos.parallax.trigfloate_plxError on plxmasstat.error;pos.parallaxfloatpmRAProper motion in right ascension (1)mas/yrpos.pm;pos.eq.radoublee_pmRAError on pmRAmas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion in declination (1)mas/yrpos.pm;pos.eq.decdoublee_pmDEError on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatCORCorrections estimated from the average magnitude of the common reference stars and the Galaxy model of Mendez & van Altena (1996AJ....112..655M) in the z-bandmasphot.mag;arith.difffloatNobsNumber of observations used in the final solutionmeta.numberintNobjNumber of anonymous objects used as references in the transformation of sequence frames to the base framemeta.numberintDeltaTEpoch coverage of the frames in the final solutionyrtime.intervalfloatIDShort name for each objectmeta.id;meta.mainchar