Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion

We identify Gaia 0007-1605 A,C as the first inner brown dwarf-white dwarf binary of a hierarchical triple system in which the outer component is another white dwarf (Gaia 0007-1605 B). From optical/near-infrared spectroscopy obtained at the Very Large Telescope with the X-Shooter instrument and/or f...

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Authors: Rebassa-Mansergas, Alberto, Xu, Siyi, Raddi, Roberto, Pala, A. F., Solano, Enrique, Jiménez-Esteban, Francisco M., Cruz, Patricia
Format: article
Status:Published version
Publication Date:2022
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/276484
Online Access:http://hdl.handle.net/10261/276484
Access Level:Open access
Keyword:White dwarf stars
Trinary stars
Brown dwarf stars
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spelling Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf CompanionRebassa-Mansergas, AlbertoXu, SiyiRaddi, RobertoPala, A. F.Solano, EnriqueJiménez-Esteban, Francisco M.Cruz, PatriciaWhite dwarf starsTrinary starsBrown dwarf starsWe identify Gaia 0007-1605 A,C as the first inner brown dwarf-white dwarf binary of a hierarchical triple system in which the outer component is another white dwarf (Gaia 0007-1605 B). From optical/near-infrared spectroscopy obtained at the Very Large Telescope with the X-Shooter instrument and/or from Gaia photometry plus spectral energy distribution fitting, we determine the effective temperatures and masses of the two white dwarfs (12,018 ± 68 K and 0.54 ± 0.01 M ⊙ for Gaia 0007-1605 A and 4445 ± 116 K and 0.56 ± 0.05 M ⊙ for Gaia 0007-1605 B) and the effective temperature of the brown dwarf (1850 ± 50 K; corresponding to spectral type L3 ± 1). By analyzing the available TESS light curves of Gaia 0007-1605 A,C we detect a signal at 1.0446 ± 0.0015 days with an amplitude of 6.25 ppt, which we interpret as the orbital period modulated from irradiation effects of the white dwarf on the brown dwarf's surface. This drives us to speculate that the inner binary evolved through a common-envelope phase in the past. Using the outer white dwarf as a cosmochronometer and analyzing the kinematic properties of the system, we conclude that the triple system is about 10 Gyr old.A.R.M. acknowledges support from Grant RYC-2016–20254 funded by MCIN/AEI/10.13039/501100011033 and by ESF Investing in your future. S.X. is supported by the international Gemini Observatory, a program of NSF's NOIRLab, which is managed by the Association of Universities for Research in Astronomy (AURA) under a cooperative agreement with the National Science Foundation, on behalf of the Gemini partnership of Argentina, Brazil, Canada, Chile, the Republic of Korea, and the United States of America. R.R. has received funding from the postdoctoral fellowship program Beatriu de Pinós, funded by the Secretary of Universities and Research (Government of Catalonia) and by the Horizon 2020 program of research and innovation of the European Union under the Maria Skłodowska-Curie grant agreement No. 801370. S.T. and A.R.M. acknowledge support from the MINECO under the PID2020-117252GB-I00 grant. F.J.E. acknowledges financial support from the Spanish MINECO/FEDER through the grant MDM-2017–0737 at Centro de Astrobiología (CSIC-INTA), Unidad de Excelencia María de Maeztu. P.C. acknowledges financial support from the Government of Comunidad Autónoma de Madrid (Spain), via postdoctoral grant Atracción de Talento Investigador 2019-T2/TIC-14760.IOP PublishingMinisterio de Ciencia e Innovación (España)National Science Foundation (US)Generalitat de CatalunyaEuropean CommissionMinisterio de Economía y Competitividad (España)Comunidad de MadridConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]2022202220222022info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/276484reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Inglés#PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE##PLACEHOLDER_PARENT_METADATA_VALUE#info:eu-repo/grantAgreement/MCINN//RYC-2016–20254info:eu-repo/grantAgreement/EC/H2020/801370info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-117252GB-I00http://doi.org/10.3847/2041-8213/ac5a55Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2764842026-05-22T06:33:51Z
dc.title.none.fl_str_mv Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
title Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
spellingShingle Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
Rebassa-Mansergas, Alberto
White dwarf stars
Trinary stars
Brown dwarf stars
title_short Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
title_full Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
title_fullStr Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
title_full_unstemmed Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
title_sort Gaia 0007-1605: An Old Triple System with an Inner Brown Dwarf-White Dwarf Binary and an Outer White Dwarf Companion
dc.creator.none.fl_str_mv Rebassa-Mansergas, Alberto
Xu, Siyi
Raddi, Roberto
Pala, A. F.
Solano, Enrique
Jiménez-Esteban, Francisco M.
Cruz, Patricia
author Rebassa-Mansergas, Alberto
author_facet Rebassa-Mansergas, Alberto
Xu, Siyi
Raddi, Roberto
Pala, A. F.
Solano, Enrique
Jiménez-Esteban, Francisco M.
Cruz, Patricia
author_role author
author2 Xu, Siyi
Raddi, Roberto
Pala, A. F.
Solano, Enrique
Jiménez-Esteban, Francisco M.
Cruz, Patricia
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
National Science Foundation (US)
Generalitat de Catalunya
European Commission
Ministerio de Economía y Competitividad (España)
Comunidad de Madrid
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv White dwarf stars
Trinary stars
Brown dwarf stars
topic White dwarf stars
Trinary stars
Brown dwarf stars
description We identify Gaia 0007-1605 A,C as the first inner brown dwarf-white dwarf binary of a hierarchical triple system in which the outer component is another white dwarf (Gaia 0007-1605 B). From optical/near-infrared spectroscopy obtained at the Very Large Telescope with the X-Shooter instrument and/or from Gaia photometry plus spectral energy distribution fitting, we determine the effective temperatures and masses of the two white dwarfs (12,018 ± 68 K and 0.54 ± 0.01 M ⊙ for Gaia 0007-1605 A and 4445 ± 116 K and 0.56 ± 0.05 M ⊙ for Gaia 0007-1605 B) and the effective temperature of the brown dwarf (1850 ± 50 K; corresponding to spectral type L3 ± 1). By analyzing the available TESS light curves of Gaia 0007-1605 A,C we detect a signal at 1.0446 ± 0.0015 days with an amplitude of 6.25 ppt, which we interpret as the orbital period modulated from irradiation effects of the white dwarf on the brown dwarf's surface. This drives us to speculate that the inner binary evolved through a common-envelope phase in the past. Using the outer white dwarf as a cosmochronometer and analyzing the kinematic properties of the system, we conclude that the triple system is about 10 Gyr old.
publishDate 2022
dc.date.none.fl_str_mv 2022
2022
2022
2022
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/276484
url http://hdl.handle.net/10261/276484
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv #PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
#PLACEHOLDER_PARENT_METADATA_VALUE#
info:eu-repo/grantAgreement/MCINN//RYC-2016–20254
info:eu-repo/grantAgreement/EC/H2020/801370
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-117252GB-I00
http://doi.org/10.3847/2041-8213/ac5a55
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv IOP Publishing
publisher.none.fl_str_mv IOP Publishing
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
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