Spectral library of age-benchmark low-mass stars and brown dwarfs

In recent years, some extremely red brown dwarfs have been discovered. They were believed to have a low surface gravity, but many of their spectral characteristics are similar to those of high-surface-gravity brown dwarfs, showing that the spectral characteristics of young brown dwarfs are poorly un...

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Authors: Manjavacas, E., Lodieu, N., Béjar, V. J. S., Zapatero Osorio, María Rosa, Boudreault, S., Bonnefoy, M.
Format: article
Status:Published version
Publication Date:2020
Country:España
Institution:Instituto Nacional de Técnica Aeroespacial (INTA)
Repository:DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
OAI Identifier:oai:digital.inta.es:20.500.12666/226
Online Access:https://academic.oup.com/mnras/article/491/4/5925/5688223
http://hdl.handle.net/20.500.12666/226
Access Level:Open access
Keyword:Brown dwarfs
Stars: fundamental parameters
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv Spectral library of age-benchmark low-mass stars and brown dwarfs
title Spectral library of age-benchmark low-mass stars and brown dwarfs
spellingShingle Spectral library of age-benchmark low-mass stars and brown dwarfs
Manjavacas, E.
Brown dwarfs
Stars: fundamental parameters
title_short Spectral library of age-benchmark low-mass stars and brown dwarfs
title_full Spectral library of age-benchmark low-mass stars and brown dwarfs
title_fullStr Spectral library of age-benchmark low-mass stars and brown dwarfs
title_full_unstemmed Spectral library of age-benchmark low-mass stars and brown dwarfs
title_sort Spectral library of age-benchmark low-mass stars and brown dwarfs
dc.creator.none.fl_str_mv Manjavacas, E.
Lodieu, N.
Béjar, V. J. S.
Zapatero Osorio, María Rosa
Boudreault, S.
Bonnefoy, M.
author Manjavacas, E.
author_facet Manjavacas, E.
Lodieu, N.
Béjar, V. J. S.
Zapatero Osorio, María Rosa
Boudreault, S.
Bonnefoy, M.
author_role author
author2 Lodieu, N.
Béjar, V. J. S.
Zapatero Osorio, María Rosa
Boudreault, S.
Bonnefoy, M.
author2_role author
author
author
author
author
dc.contributor.none.fl_str_mv Manjavacas, E. [0000-0003-0192-6887]
Zapatero Osorio, M. R. [0000-0001-5664-2852]
Ministerio de Economía y Competitividad (MINECO)
Agencia Estatal de Investigación (AEI)
dc.subject.none.fl_str_mv Brown dwarfs
Stars: fundamental parameters
topic Brown dwarfs
Stars: fundamental parameters
description In recent years, some extremely red brown dwarfs have been discovered. They were believed to have a low surface gravity, but many of their spectral characteristics are similar to those of high-surface-gravity brown dwarfs, showing that the spectral characteristics of young brown dwarfs are poorly understood. We aim to test surface-gravity indicators in late-M and early-L brown dwarf spectra using data obtained with the X-shooter spectrograph at the Very Large Telescope. We select a benchmark sample of brown dwarf members of Chamaeleon I (∼2 Myr), Upper Scorpius (5−10 Myr), the Pleiades (132 ± 27 Myr) and Praesepe (590−790 Myr) with well-constrained ages and similar metallicities. We provide a consistent spectral classification of the sample in the optical and in the near-infrared. We measure the equivalent widths of their alkali lines, finding that they have a moderate correlation with age, especially for objects with spectral types M8 and later. We use spectral indices defined in the literature to estimate surface gravity, finding that their gravity assignment is accurate for 75 per cent of our sample. We investigate the correlation between red colour and age, finding that after ∼10 Myr, the colour does not change significantly for our sample with spectral types M6.0–L3.0. In this case, the red colours might be associated with circumstellar discs, ring structures, extinction, or viewing angle. Finally, we calculate the bolometric luminosity, and J and K bolometric corrections for our sample. We find that six objects are overluminous compared with other members of the same association. These objects are flagged as binary candidates by the Gaia survey.
publishDate 2020
dc.date.none.fl_str_mv 2020
2021
2021
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://academic.oup.com/mnras/article/491/4/5925/5688223
http://hdl.handle.net/20.500.12666/226
url https://academic.oup.com/mnras/article/491/4/5925/5688223
http://hdl.handle.net/20.500.12666/226
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv ENANAS MARRONES Y PLANETAS AISLADOS Y COMO COMPAÑEROS DE ESTRELLAS
info:eu-repo/grantAgreement/MINECO//AYA2015-69350-C3-2-P
ORIGEN Y EVOLUCION DE LAS ENANAS MARRONES Y PLANETAS GIGANTES
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016-79425-C3-2-P
dc.rights.none.fl_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
Copyright © 2019, Oxford University Press
https://creativecommons.org/licenses/by-nc-nd/4.0/
info:eu-repo/semantics/openAccess
rights_invalid_str_mv Attribution-NonCommercial-NoDerivatives 4.0 International
Copyright © 2019, Oxford University Press
https://creativecommons.org/licenses/by-nc-nd/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Oxford Academics: Oxford University Press
publisher.none.fl_str_mv Oxford Academics: Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
instname:Instituto Nacional de Técnica Aeroespacial (INTA)
instname_str Instituto Nacional de Técnica Aeroespacial (INTA)
reponame_str DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
collection DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial
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spelling Spectral library of age-benchmark low-mass stars and brown dwarfsManjavacas, E.Lodieu, N.Béjar, V. J. S.Zapatero Osorio, María RosaBoudreault, S.Bonnefoy, M.Brown dwarfsStars: fundamental parametersIn recent years, some extremely red brown dwarfs have been discovered. They were believed to have a low surface gravity, but many of their spectral characteristics are similar to those of high-surface-gravity brown dwarfs, showing that the spectral characteristics of young brown dwarfs are poorly understood. We aim to test surface-gravity indicators in late-M and early-L brown dwarf spectra using data obtained with the X-shooter spectrograph at the Very Large Telescope. We select a benchmark sample of brown dwarf members of Chamaeleon I (∼2 Myr), Upper Scorpius (5−10 Myr), the Pleiades (132 ± 27 Myr) and Praesepe (590−790 Myr) with well-constrained ages and similar metallicities. We provide a consistent spectral classification of the sample in the optical and in the near-infrared. We measure the equivalent widths of their alkali lines, finding that they have a moderate correlation with age, especially for objects with spectral types M8 and later. We use spectral indices defined in the literature to estimate surface gravity, finding that their gravity assignment is accurate for 75 per cent of our sample. We investigate the correlation between red colour and age, finding that after ∼10 Myr, the colour does not change significantly for our sample with spectral types M6.0–L3.0. In this case, the red colours might be associated with circumstellar discs, ring structures, extinction, or viewing angle. Finally, we calculate the bolometric luminosity, and J and K bolometric corrections for our sample. We find that six objects are overluminous compared with other members of the same association. These objects are flagged as binary candidates by the Gaia survey.This publication makes use of data products from the Two Micron All Sky Survey, 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 The work is based on observations (programme GTC66-12B) made with the Gran Telescopio Canarias (GTC), operated on the island of La Palma in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrof ' isica de Canarias, and with observations collected at the EU Organization for Astronomical Research in the Southern Hemisphere under ESO programmes 098.C0277(A), 0.93.C-0109(A), and 0.95.C-0812(A), 0.93.C-0769(A) and 0.95.C-0378(A). It has made use of data from the European Space Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia), processed by the Gaia Data Processing and Analysis Consortium (DPAC, ht tps://www.cosmos.esa.int/web/gaia/dpac/consortium).Funding for the DPAC was provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. NL and VJSB are supported by programme AYA2015-69350C3-2-P, and MRZO by programme AYA2016-79425-C3-2-P from the Spanish Ministry of Economy and Competitiveness (MINECO). Based on observations of VLT/XSHOOTER, under the program ID 098.C-0277.Peer reviewOxford Academics: Oxford University PressManjavacas, E. [0000-0003-0192-6887]Zapatero Osorio, M. R. [0000-0001-5664-2852]Ministerio de Economía y Competitividad (MINECO)Agencia Estatal de Investigación (AEI)202120212020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501application/pdfhttps://academic.oup.com/mnras/article/491/4/5925/5688223http://hdl.handle.net/20.500.12666/226reponame:DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacialinstname:Instituto Nacional de Técnica Aeroespacial (INTA)InglésENANAS MARRONES Y PLANETAS AISLADOS Y COMO COMPAÑEROS DE ESTRELLASinfo:eu-repo/grantAgreement/MINECO//AYA2015-69350-C3-2-PORIGEN Y EVOLUCION DE LAS ENANAS MARRONES Y PLANETAS GIGANTESinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016-79425-C3-2-PAttribution-NonCommercial-NoDerivatives 4.0 InternationalCopyright © 2019, Oxford University Presshttps://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:digital.inta.es:20.500.12666/2262026-06-23T12:46:37Z
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