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dc.contributor.authorPérez Garrido, Antonio 
dc.contributor.authorLodieu, Nicolas 
dc.contributor.authorRebolo López, Rafael 
dc.coverage.spatialeast=-17.8917017; north=28.7560771; name=38788, Gran Telecopio de Canarias, Santa Cruz de Tenerife, Españaes_ES
dc.date.accessioned2019-05-09T06:27:01Z
dc.date.available2019-05-09T06:27:01Z
dc.date.issued2017-03
dc.identifier.citationP'erez-Garrido, Antonio, Nicolas Lodieu and R. Rebolo. “A new L5 brown dwarf member of the Hyades cluster with chromospheric activity.” (2017). En: Astronomy & astrophysics, 599, A78es_ES
dc.identifier.issn1432-0746
dc.description.abstractOur aim is to identify brown dwarf members of the nearby Hyades open star cluster to determine the photometric and spectroscopic properties of brown dwarfs at moderately old ages and extend the knowledge of the substellar mass function of the cluster. We cross-matched the 2MASS and AllWISE public catalogues and measured proper motions to identify low-mass stars and brown dwarf candidates in an area of radius eight degrees around the central region of the Hyades cluster. We identified objects with photometry and proper motions consistent with cluster membership. For the faintest (J\,=\,17.2 mag) most promising astrometric and photometric low-mass candidate 2MASS\,J04183483+2131275\@, with a membership probability of 94.5\%, we obtained low-resolution (R\,=\,300--1000) and intermediate-resolution (R\,=\,2500) spectroscopy with the 10.4m Gran Telescopio Canarias. From the low-resolution spectra we determined a L5.0±0.5 spectral type, consistent with the available photometry. In the intermediate dispersion spectrum we detected Hα in emission (marginally resolved with a full width half maximum of ∼2.8 \AA{}) and determined a log(LHα/Lbol)=−6.0 dex. From Hα we obtained a radial velocity of 38.0±2.9 km⋅s−1, which combined with the proper motion leads to space velocities which are fully consistent with membership in the Hyades cluster. We also report a detection in the H2 band by the UKIDSS Galactic Plane Survey. Using evolutionary models we determine from the available photometry of the object a mass in the range 0.039􀀀0.055 M . Brown dwarfs with masses below 0.055 M should fully preserve its initial lithium content, and indeed the spectrum at 6708 Å may show a feature consistent with lithium preservation; however, a higher S/N is needed to confirm this point. Conclusions. We have identified a new high-probability L5 brown dwarf member of the Hyades cluster. This is the first relatively old L5 brown dwarf with a well-determined age (500􀀀700 Myr) and measured chromospheric emission.es_ES
dc.description.sponsorshipThis research has been supported by Project No. 15345/PI/10 from the Fundación Séneca and the Spanish Ministry of Economy and Competitiveness (MINECO) under the grants AYA2015-69350- C3-2-P and AYA2015-69350-C3-3-P. This work is based on observations made with the Gran Telescopio Canarias (GTC), operated on the island of La Palma at the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofísica de Canarias (programme GTC37-15A led by Pérez Garrido and programmes GTC51–14B and GTC38-15A led by Lodieu). This research has made use of data from the UKIDSS project defined in Lawrence et al. (2007). UKIDSS uses the UKIRT Wide Field Camera (WFCAM; Casali et al. 2007). The photometric system is described in Hewett et al. (2006), and the calibration is described in Hodgkin et al. (2009). The pipeline processing and science archive are described in Irwin et al. (in prep.) and Hambly et al. (2008). This publication makes use of data products from the Two Micron All Sky Survey (2MASS), which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center/California Institute of Technology, funded by the National Aeronautics and Space Administration and the National Science Foundation. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institutof Technology, funded by the National Aeronautics and Space Administration. Data from the Sloan Digital Sky Survey IV has been employed in the work. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS-IV acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS web site is www.sdss.org. SDSS-IV is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, the Chilean Participation Group, the French Participation Group, Harvard-Smithsonian Center for Astrophysics, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatory of China, New Mexico State University, New York University, University of Notre Dame, Observatário Nacional/MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of the Simbad and Vizier databases, operated at the Centre de Données Astronomiques de Strasbourg (CDS), and of NASA’s Astrophysics Data System Bibliographic Services (ADS).es_ES
dc.formatapplication/pdfes_ES
dc.language.isoenges_ES
dc.publisherEDP Scienceses_ES
dc.relation.urihttps://www.aanda.org/articles/aa/pdf/2017/03/aa28778-16.pdfes_ES
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 España*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/3.0/es/*
dc.titleA new L5 brown dwarf member of the Hyades cluster with chromospheric activityes_ES
dc.typeinfo:eu-repo/semantics/articlees_ES
dc.subject.otherFísica Aplicadaes_ES
dc.subjectStars: low-masses_ES
dc.subjectOpen clusters and associations: individual: Hyadeses_ES
dc.subjectTechniques: photometrices_ES
dc.subjectTechniques: spectroscopic – surveyses_ES
dc.identifier.urihttp://hdl.handle.net/10317/7760
dc.identifier.doi10.1051/0004-6361/201628778
dc.rights.accessRightsinfo:eu-repo/semantics/openAccesses_ES
dc.type.versioninfo:eu-repo/semantics/publishedVersiones_ES
dc.subject.unesco21 Astronomía y Astrofísicaes_ES
dc.contributor.funderInstituto de Astrofísica de Canariases_ES
dc.contributor.funderLeibniz-Institut für Astrophysik Potsdam (AIP)es_ES


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