Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh

Faris, Sara: et al.

Bibliographic Details
Authors: Faris, Sara, Gutiérrez, Claudia P., Galbany, Lluís
Format: article
Status:Published version
Publication Date:2024
Country:España
Institution:Consejo Superior de Investigaciones Científicas (CSIC)
Repository:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/381811
Online Access:http://hdl.handle.net/10261/381811
https://api.elsevier.com/content/abstract/scopus_id/85198081696
Access Level:Open access
Keyword:Accretion
Tidal disruption
Supermassive black holes
Ultraviolet transient sources
http://astrothesaurus.org/uat/14
http://astrothesaurus.org/uat/1696
http://astrothesaurus.org/uat/1663
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network_name_str España
repository_id_str
dc.title.none.fl_str_mv Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
title Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
spellingShingle Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
Faris, Sara
Accretion
Tidal disruption
Supermassive black holes
Ultraviolet transient sources
http://astrothesaurus.org/uat/14
http://astrothesaurus.org/uat/14
http://astrothesaurus.org/uat/1696
http://astrothesaurus.org/uat/1663
title_short Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
title_full Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
title_fullStr Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
title_full_unstemmed Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
title_sort Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azh
dc.creator.none.fl_str_mv Faris, Sara
Gutiérrez, Claudia P.
Galbany, Lluís
author Faris, Sara
author_facet Faris, Sara
Gutiérrez, Claudia P.
Galbany, Lluís
author_role author
author2 Gutiérrez, Claudia P.
Galbany, Lluís
author2_role author
author
dc.contributor.none.fl_str_mv European Research Council
European Commission
Israel Science Foundation
National Science Foundation (US)
Science and Technology Facilities Council (UK)
Villum Fonden
UK Space Agency
Generalitat de Catalunya
Ministerio de Ciencia e Innovación (España)
Agencia Estatal de Investigación (España)
Consejo Superior de Investigaciones Científicas (España)
Ministero dell'Istruzione, dell'Università e della Ricerca
Academy of Finland
Agencia Nacional de Investigación y Desarrollo (Chile)
Faris, Sara [0009-0007-8485-1281]
Gutiérrez, Claudia P. [0000-0003-2375-2064]
Galbany, Lluís [0000-0002-1296-6887]
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Accretion
Tidal disruption
Supermassive black holes
Ultraviolet transient sources
http://astrothesaurus.org/uat/14
http://astrothesaurus.org/uat/14
http://astrothesaurus.org/uat/1696
http://astrothesaurus.org/uat/1663
topic Accretion
Tidal disruption
Supermassive black holes
Ultraviolet transient sources
http://astrothesaurus.org/uat/14
http://astrothesaurus.org/uat/14
http://astrothesaurus.org/uat/1696
http://astrothesaurus.org/uat/1663
description Faris, Sara: et al.
publishDate 2024
dc.date.none.fl_str_mv 2024
2025
2025
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/10261/381811
https://api.elsevier.com/content/abstract/scopus_id/85198081696
url http://hdl.handle.net/10261/381811
https://api.elsevier.com/content/abstract/scopus_id/85198081696
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
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info:eu-repo/grantAgreement/EC/H2020/852097
info:eu-repo/grantAgreement/EC/H2020/948381
info:eu-repo/grantAgreement/AEI//RYC2019-027683-I
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/PID2020-115253GA-I00
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2021-2023/CEX2020-001058-M
The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.3847/1538-4357/ad4a72
https://doi.org/10.3847/1538-4357/ad4a72
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv IOP Publishing
American Astronomical Society
publisher.none.fl_str_mv IOP Publishing
American Astronomical Society
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
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spelling Light-curve Structure and Hα Line Formation in the Tidal Disruption Event AT 2019azhFaris, SaraGutiérrez, Claudia P.Galbany, LluísAccretionTidal disruptionSupermassive black holesUltraviolet transient sourceshttp://astrothesaurus.org/uat/14http://astrothesaurus.org/uat/14http://astrothesaurus.org/uat/1696http://astrothesaurus.org/uat/1663Faris, Sara: et al.AT 2019azh is a H+He tidal disruption event (TDE) with one of the most extensive ultraviolet and optical data sets available to date. We present our photometric and spectroscopic observations of this event starting several weeks before and out to approximately 2 yr after the g-band's peak brightness and combine them with public photometric data. This extensive data set robustly reveals a change in the light-curve slope and a possible bump in the rising light curve of a TDE for the first time, which may indicate more than one dominant emission mechanism contributing to the pre-peak light curve. Indeed, we find that the MOSFiT-derived parameters of AT 2019azh, which assume reprocessed accretion as the sole source of emission, are not entirely self-consistent. We further confirm the relation seen in previous TDEs whereby the redder emission peaks later than the bluer emission. The post-peak bolometric light curve of AT 2019azh is better described by an exponential decline than by the canonical t −5/3 (and in fact any) power-law decline. We find a possible mid-infrared excess around the peak optical luminosity, but cannot determine its origin. In addition, we provide the earliest measurements of the Hα emission-line evolution and find no significant time delay between the peak of the V-band light curve and that of the Hα luminosity. These results can be used to constrain future models of TDE line formation and emission mechanisms in general. More pre-peak 1-2 days cadence observations of TDEs are required to determine whether the characteristics observed here are common among TDEs. More importantly, detailed emission models are needed to fully exploit such observations for understanding the emission physics of TDEs.We thank B. Mockler for helpful advice on using MOSFiT. S.F., I.A., and L.M. acknowledge support from the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (grant agreement No. 852097). S.F. and I.A. acknowledge further support from the Israel Science Foundation (grant No. 2108/18). The Las Cumbres Observatory group is supported by National Science Foundation (NSF) grants AST-1911225 and AST-1911151. P.C. and O.G. were supported by the Science & Technology Facilities Council (grants ST/S000550/1 and ST/W001225/1). G.L. was supported by a research grant (19054) from VILLUM FONDEN. M.N. is supported by the ERC under the European Union's Horizon 2020 research and innovation program (grant agreement No. 948381) and by UK Space Agency grant No. ST/Y000692/1. C.P.G. acknowledges financial support from the Secretary of Universities and Research (Government of Catalonia) and by the Horizon 2020 Research and Innovation Program of the European Union under the Marie Skłodowska-Curie program. The SNICE research group acknowledges financial support from the Spanish Ministerio de Ciencia e Innovación (MCIN), the Agencia Estatal de Investigación (AEI) 10.13039/501100011033, and the European Social Fund (ESF) "Investing in your future" under the 2019 Ramón y Cajal program RYC2019-027683-I and the PID2020-115253GA-I00 HOSTFLOWS project, from Centro Superior de Investigaciones Científicas (CSIC) under the PIE project 20215AT016, and the program Unidad de Excelencia María de Maeztu CEX2020-001058-M, and from the Departament de Recerca i Universitats de la Generalitat de Catalunya through the 2021-SGR-01270 grant. S.M. and T.R. acknowledge support from the Research Council of Finland project 350458. A.V.F.'s group at UC Berkeley has been supported by the Christopher R. Redlich Fund, William Draper, Timothy and Melissa Draper, Briggs and Kathleen Wood, Sanford Robertson (T.G.B. is a Draper-Wood-Robertson Specialist in Astronomy), and numerous other donors. F.O. acknowledges support from MIUR, PRIN 2020 (grant 2020KB33TP) "Multimessenger astronomy in the Einstein Telescope Era (METE)." E.R.C. acknowledges support from the National Science Foundation through grant AST-2006684. P.C. acknowledges support via an Academy of Finland grant (340613; PI: R. Kotak). This work was funded in part by ANID, Millennium Science Initiative, ICN12_009.With funding from the Spanish government through the "María de Maeztu Unit of Excellence" accreditation (CEX2020-001058-M)Peer reviewedIOP PublishingAmerican Astronomical SocietyEuropean Research CouncilEuropean CommissionIsrael Science FoundationNational Science Foundation (US)Science and Technology Facilities Council (UK)Villum FondenUK Space AgencyGeneralitat de CatalunyaMinisterio de Ciencia e Innovación (España)Agencia Estatal de Investigación (España)Consejo Superior de Investigaciones Científicas (España)Ministero dell'Istruzione, dell'Università e della RicercaAcademy of FinlandAgencia Nacional de Investigación y Desarrollo (Chile)Faris, Sara [0009-0007-8485-1281]Gutiérrez, Claudia P. [0000-0003-2375-2064]Galbany, Lluís [0000-0002-1296-6887]Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]202520252024info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionapplication/pdfhttp://hdl.handle.net/10261/381811https://api.elsevier.com/content/abstract/scopus_id/85198081696reponame:DIGITAL.CSIC. 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