Ultracool dwarfs in Gaia DR3 J/A+A/669/A139 ivo://CDS.VizieR/J/A+A/669/A139 doi:10.26093/cds/vizier.36690139 CDS Sarro L.M. Berihuete A. Smart R.L. Reyle C. Barrado D.,Garcia-Torres M. Cooper W.J. Jones H.R.A. Marocco F. Creevey O.L.,Sordo R. Bailer-Jones C.A.L. Montegriffo P. Carballo R. Andrae R.,Fouesneau M. Lanzafame A.C. Pailler F. Thevenin F. Lobel A.,Delchambre L. Korn A.J. Recio-Blanco A. Schultheis M.S. De Angeli F.,Brouillet N. Casamiquela L. Contursi G. de Laverny P. Garcia-Lario P.,Kordopatis G. Lebreton Y. Livanou E. Lorca A. Palicio P.A.,Slezak-Oreshina I. Soubiran C. Ulla A. Zhao H. 2024-11-28T20:01:45Z 2023-01-26T07:42:19Z CDS support team CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France cds-question@unistra.fr stellar-associations open-star-clusters dwarf-stars visible-astronomy Previous Gaia Data Releases offered the opportunity to uncover ultracool dwarfs (UCDs) through astrometric, rather than purely photometric selection. The most recent, third data release offers in addition the opportunity to use low-resolution spectra to refine and widen the selection. In this work we use the Gaia DR3 set of ultracool dwarf candidates and complement the Gaia spectrophotometry with additional photometry in order to characterise its global properties. This includes the inference of the distances, their locus in the Gaia colour-absolute magnitude diagram and the (biased through selection) luminosity function in the faint end of the Main Sequence. We study the overall changes in the Gaia RP spectra as a function of spectral type. We study the UCDs in binary systems, attempt to identify low-mass members of nearby young associations, star forming regions and clusters, and analyse their variability properties. We use a forward model and the Bayesian inference framework to produce posterior probabilities for the distribution parameters and a calibration of the colour index as a function of the absolute magnitude in the form of a Gaussian Process. Additionally we apply the HMAC unsupervised classification algorithm for the detection and characterisation of overdensities in the space of celestial coordinates, projected velocities and parallaxes. We detect 57 young, kinematically homogeneous groups some of which are identified as well known star forming regions, associations and clusters of different ages. We find that the primary members of 880 binary systems with a UCD belong mainly to the thin and thick disk components of the Milky Way. We identify 1109 variable UCDs using the variability tables in the Gaia archive, 728 of which belong to the star forming regions defined by HMAC. We define two groups of variable UCDs with extreme bright or faint outliers. The set of sources identified as UCDs in the Gaia archive contains a wealth of information that will require focused follow-up studies and observations. It will help to advance our understanding of the nature of the faint end of the Main Sequence and the stellar/substellar transition. 2023A&A...669A.139S https://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/669/A139 Catalog Research IsServedBy TAP VizieR generic service IsServedBy Conesearch service related-to I/355 : Gaia DR3 Part 1. Main source (Gaia Collaboration, 2022) https://cds.unistra.fr/vizier-org/licences_vizier.html https://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/669/A139 https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/669/A139 http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/669/A139 https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/669/A139 https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/669/A139 http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/669/A139 GET text/xml+votable https://tapvizier.cds.unistra.fr/TAPVizieR/tap Cone search capability for table J/A+A/669/A139/table4 (Cluster assignments for Gaia ultracool dwarfs from BANYAN and HMAC) https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/669/A139/table4? https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/669/A139/table4? http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/669/A139/table4? 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42579 42581-42584 42588-42589 42591 42600 42603 42605 42607-42609 42611 42614 42616-42618 42620-42621 42623 42630 42637-42638 42640-42642 42648 42651-42653 42665 42668 42670 42675 42678-42679 42681 42683-42684 42686 42696 42698 42700 42708-42709 42712-42714 42716-42718 42725-42727 42733-42735 42743-42746 42748-42750 42752-42753 42755-42758 42762-42763 42766-42769 42771 42774 42780-42781 42783-42784 42787 42793-42794 42798 42805 42808 42813 42816 42820 42826 42830-42831 42833 42848 42850-42851 42853 42855 42858 42861 42868 42874 42877-42880 42882 42884-42885 42888-42889 42895-42896 42898 42901-42902 42904 42912 42916-42917 42919-42920 42924 42927 42929 42931 42938-42939 42944 42946-42950 42974-42975 42996-42998 43000-43001 43006-43008 43011 43018-43020 43025-43026 43033-43034 43046 43048 43052 43055 43058 43060 43062-43063 43072-43073 43079-43080 43087 43090 43094-43096 43103-43105 43107 43113-43115 43121-43122 43130 43132 43134 43139 43141-43143 43149-43150 43152-43154 43156-43157 43159 43161-43164 43166-43167 43169 43171-43172 43174 43179 43181-43184 43187-43188 43192 43194 43196-43198 43200 43203-43206 43208 43210 43214-43217 43223-43224 43226-43227 43229-43231 43235 43237-43238 43240-43241 43244 43250-43251 43256 43262 43266-43267 43270 43273-43274 43277-43279 43281 43285 43287 43293-43294 43296 43298-43299 43301-43302 43307 43314 43317 43323 43325 43330 43338-43341 43343-43345 43347 43352 43355 43359-43361 43363 43365 43367-43370 43374-43378 43380 43382-43383 43390-43394 43398-43399 43402 43408 43415-43416 43421 43423-43424 43426 43429 43431 43433 43439 43450 43457 43459-43460 43462-43463 43465 43471-43472 43475 43487 43492 43501 43509 43525-43526 43529 43531-43534 43536-43537 43544-43545 43547 43564 43575 43578 43591 43595 43599 43602 43604 43607 43613 43655 43663 43689 43712 43718 43722 43731 43773 43777 43780 43798 43818 43842 43878 43888 43965-43966 43984 44008 44036 44038-44040 44043-44044 44047 44051 44053 44055-44058 44062 44073-44074 44080 44082 44085 44088 44093 44095 44105-44106 44117-44120 44123 44126 44128 44133-44134 44140 44143 44154 44171 44177 44186 44226-44227 44230 44234 44236 44241 44244 44251 44258 44284 44288-44289 44291-44293 44309 44311-44312 44315 44321-44323 44325-44326 44330 44338-44339 44350 44368 44370-44374 44392 44397-44402 44404 44408 44410 44415-44416 44419 44433 44446 44467-44468 44481 44501 44513 44537 44563 44568 44645 44718 44743 44893 44954 45056 45059 45081 45098 45119 45150 45154 45157 45179 45194-45195 45207-45208 45210 45214 45217 45227 45232 45238 45246 45298 45308 45346 45355 45360 45440 45445 45470 45512 45524 45527 45538 45591 45606 45620 45632 45701 45706 45733 45785 45791 45804 45838 45849 45868 45918 45941 45956 45960 45994 46094 46201 46370 46374 46549 46671 46763 46850 47193 47214 47242 47267 47303 47342 47489 47507 47621 47627 47643 47674-47675 47703 47727 47738-47739 47742 47782 47789 47805 47814 47816-47817 47821-47823 47825-47826 47828 47841-47845 47847 47849 47856 47859 47864 47916 47927 47979 47993 48001 48008 48010 48056 48140 48167 48175 48193 48464 48473 48507 48604 48643 48652 49002 https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/669/A139?format=ascii Optical default J/A+A/669/A139/table4 Cluster assignments for Gaia ultracool dwarfs from BANYAN and HMAC recno Record number assigned by the VizieR team. Should Not be used for identification. meta.record int GaiaDR3 Gaia DR3 source_id meta.id;meta.main HMACcl ? HMAC cluster identifier meta.id.parent int nullable BANYANcl BANYAN best hypothesis (largest membership probability) meta.id.parent char BANYANprob ? BANYAN membership probability for the best hypothesis stat.fit.goodness float nullable _RA Positions from Gaia DR3 (right ascension part) deg pos.eq.ra;meta.main _DE Positions from Gaia DR3 (declination part) deg pos.eq.dec;meta.main