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Ultracool dwarfs in Gaia DR3

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dc.contributor.authorSarro Baro, Luis Manuel
dc.contributor.authorBerihuete, Ángel
dc.contributor.authorSmart, R. L.
dc.contributor.authorReylé, Céline
dc.contributor.authorBarrado, David
dc.contributor.authorGarcia Torres, Miguel
dc.contributor.authorCooper, W. J.
dc.contributor.authorJones, H. R. A.
dc.contributor.authorMarocco, Federico
dc.contributor.authorCreevey, Orlagh
dc.contributor.authorSordo, Rosanna
dc.contributor.authorBailer Jones, C. A. L.
dc.contributor.authorMontegriffo, P.
dc.contributor.authorRuth Carballo
dc.contributor.authorAndrae, Rene
dc.contributor.authorFouesneau, Morgan
dc.contributor.authorLanzafame, Alessandro
dc.contributor.authorPailler, Fred
dc.contributor.authorThévenin, F.
dc.contributor.authorLobel, A.
dc.contributor.authorDelchambre, L.
dc.contributor.authorKorn, Andreas J.
dc.contributor.authorRecio Blanco, Alejandra
dc.contributor.authorSchultheis, M.
dc.contributor.authorAngeli, Francesca De
dc.contributor.authorBrouillet, Nathalie
dc.contributor.authorCasamiquela, Laia
dc.contributor.authorContursi, Gabriele
dc.contributor.authorLaverny, P. de
dc.contributor.authorGarcia Lario, Pedro
dc.contributor.authorKordopatis, G.
dc.contributor.authorLebreton, Y.
dc.contributor.authorLivanou, E.
dc.contributor.authorLorca, Alejandro
dc.contributor.authorPalicio, Pedro Alonso
dc.contributor.authorSlezak Oreshina, I.
dc.contributor.authorContursi, Gabriele
dc.contributor.authorUlla, A.
dc.contributor.authorZhao, He
dc.contributor.orcidhttps://orcid.org/0000-0002-8589-4423
dc.contributor.orcidhttps://orcid.org/0000-0002-4424-4766
dc.contributor.orcidhttps://orcid.org/0000-0003-2258-2403
dc.contributor.orcidhttps://orcid.org/0000-0002-5971-9242
dc.contributor.orcidhttps://orcid.org/0000-0002-6867-7080
dc.contributor.orcidhttps://orcid.org/0000-0003-3501-8967
dc.contributor.orcidhttps://orcid.org/0000-0003-0433-3665
dc.contributor.orcidhttps://orcid.org/0000-0001-7519-1700
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dc.contributor.orcidhttps://orcid.org/0000-0003-4979-0659
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dc.contributor.orcidhttps://orcid.org/0000-0001-7412-2498
dc.contributor.orcidhttps://orcid.org/0000-0001-8006-6365
dc.contributor.orcidhttps://orcid.org/0000-0001-9256-5516
dc.contributor.orcidhttps://orcid.org/0000-0002-2697-3607
dc.contributor.orcidhttps://orcid.org/0000-0002-6855-2050
dc.contributor.orcidhttps://orcid.org/0000-0001-5030-019X
dc.contributor.orcidhttps://orcid.org/0000-0003-2559-408X
dc.contributor.orcidhttps://orcid.org/0000-0002-3881-6756
dc.contributor.orcidhttps://orcid.org/0000-0002-6590-1657
dc.contributor.orcidhttps://orcid.org/0000-0003-1879-0488
dc.contributor.orcidhttps://orcid.org/0000-0002-3274-7024
dc.contributor.orcidhttps://orcid.org/0000-0001-5238-8674
dc.contributor.orcidhttps://orcid.org/0000-0001-5370-1511
dc.contributor.orcidhttps://orcid.org/0000-0002-2817-4104
dc.contributor.orcidhttps://orcid.org/0000-0003-4039-8212
dc.contributor.orcidhttps://orcid.org/0000-0002-9035-3920
dc.contributor.orcidhttps://orcid.org/0000-0002-7985-250X
dc.contributor.orcidhttps://orcid.org/0000-0002-7432-8709
dc.contributor.orcidhttps://orcid.org/0000-0001-5370-1511
dc.contributor.orcidhttps://orcid.org/0000-0003-2645-6869
dc.date.accessioned2024-05-30T14:39:07Z
dc.date.available2024-05-30T14:39:07Z
dc.date.issued2023-01-26
dc.descriptionThe registered version of this article, first published in Astronomy & Astrophysics (A&A), is available online at the publisher's website: EDP Sciences, https://doi.org/10.1051/0004-6361/202244507
dc.descriptionLa versión registrada de este artículo, publicado por primera vez en Astronomy & Astrophysics (A&A), está disponible en línea en el sitio web del editor: EDP Sciences, https://doi.org/10.1051/0004-6361/202244507
dc.description.abstractContext. Previous Gaia data releases offered the opportunity to uncover ultracool dwarfs (UCDs) through astrometric, rather than purely photometric, selection. The most recent, the third data release (DR3), offers in addition the opportunity to use low-resolution spectra to refine and widen the selection. Aims. In this work we use the Gaia DR3 set of UCD candidates and complement the Gaia spectrophotometry with additional photometry in order to characterise the global properties of the set. This includes the inference of the distances, their locus in the Gaia colour-absolute magnitude diagram, and the (biased through selection) luminosity function at 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, we attempt to identify low-mass members of nearby young associations, star-forming regions, and clusters, and we analyse their variability properties. Methods. We used 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 applied the hierarchical mode association clustering (HMAC) unsupervised classification algorithm for the detection and characterisation of overdensities in the space of celestial coordinates, projected velocities, and parallaxes. Results. 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 the 880 binary systems with a UCD belong to the thin and thick disc 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. Conclusions. 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 advance our understanding of the nature of the faint end of the main sequence and the stellar-substellar transition.en
dc.description.versionversión publicada
dc.identifier.citationUltracool dwarfs in Gaia DR3 L. M. Sarro, A. Berihuete, R. L. Smart, C. Reylé, D. Barrado, M. García-Torres, W. J. Cooper, H. R. A. Jones, F. Marocco, O. L. Creevey A&A, 669 (2023) A139 Published online: 2023-01-26 DOI: https://doi.org/10.1051/0004-6361/202244507
dc.identifier.doihttps://doi.org/10.1051/0004-6361/202244507
dc.identifier.issn0004-6361 - eISSN 1432-0746
dc.identifier.urihttps://hdl.handle.net/20.500.14468/22235
dc.journal.titleAstronomy & Astrophysics (A&A)
dc.journal.volume669
dc.language.isoen
dc.publisherEDP Sciences
dc.relation.centerFacultades y escuelas::E.T.S. de Ingeniería Informática
dc.relation.departmentInteligencia Artificial
dc.rightsAtribución 4.0 Internacional
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/deed.es
dc.subject33 Ciencias Tecnológicas
dc.subject.keywordsbrown dwarfsen
dc.subject.keywordsstars: low-massen
dc.subject.keywordsstars: late-typeen
dc.subject.keywordsmethods: statisticalen
dc.subject.keywordsHertzsprung-Russell and C-M diagramsen
dc.subject.keywordsstars: pre-main sequenceen
dc.titleUltracool dwarfs in Gaia DR3es
dc.typeartículoes
dc.typejournal articleen
dspace.entity.typePublication
person.familyNameSarro Baro
person.givenNameLuis Manuel
person.identifier.orcid0000-0002-5622-5191
relation.isAuthorOfPublication9f881bbd-b55d-43bd-87b0-41f8f72cff48
relation.isAuthorOfPublication.latestForDiscovery9f881bbd-b55d-43bd-87b0-41f8f72cff48
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