Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow

Astronomy and Astrophysics 544 (2012): A93 Reproduced with permission from Astronomy & Astrophysics

Detalhes bibliográficos
Autores: Sicilia-Aguilar, Aurora, Kóspál, Ågnes, Setiawan, Johny, Ábrahám, Péter, Dullemond, Cornelis, Eiroa, Carlos, Goto, Miwa, Henning, Th., Juhász, Attila
Formato: artículo
Fecha de publicación:2012
País:España
Recursos:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/662230
Acesso em linha:http://hdl.handle.net/10486/662230
https://dx.doi.org/10.1051/0004-6361/201118555
Access Level:acceso abierto
Palavra-chave:Line: profiles
Protoplanetary disks
Stars: individual: EX Lupi
Stars: low-mass
Stars: pre-main sequence
Stars: variables: T Tauri, Herbig Ae/Be
Física
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spelling Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flowSicilia-Aguilar, AuroraKóspál, ÅgnesSetiawan, JohnyÁbrahám, PéterDullemond, CornelisEiroa, CarlosGoto, MiwaHenning, Th.Juhász, AttilaLine: profilesProtoplanetary disksStars: individual: EX LupiStars: low-massStars: pre-main sequenceStars: variables: T Tauri, Herbig Ae/BeFísicaAstronomy and Astrophysics 544 (2012): A93 Reproduced with permission from Astronomy & AstrophysicsContext. EX Lupi is the prototype of EXor variables. After 50 years of mild variability and smaller outbursts, the object again experienced a large outburst in 2008. Aims. We explore the accretion mechanisms in EX Lupi during its pre-outburst, outburst, and post-outburst phases. Methods. We analyze 10 high-resolution optical spectra of EX Lupi, taken before, during, and after the 2008 outburst. In both quiescence and outburst, the star presents many permitted emission lines. These include lines typical of accreting T Tauri stars, plus a large number of neutral and ionized metallic lines (mostly Fe I and Fe II). During the outburst, the number of emission lines increases to about a thousand, and their structure shows a narrow and a broad component (NC and BC). We study the structure of the BC, which is highly variable on short timescales (24−72 h). Results. An active chromosphere can explain the metallic lines in quiescence and the outburst NC. The dynamics of the BC line profiles suggest that these profiles originate in a hot, dense, non-axisymmetric, and non-uniform accretion column that suffers velocity variations along the line-of-sight on timescales of days. Assuming Keplerian rotation, the emitting region would be located at ∼0.1−0.2 AU, which is consistent with the location of the inner disk rim, but the velocity profiles of the lines reveal a combination of rotation and infall. Line ratios of ions and neutrals can be reproduced assuming a temperature of T ∼ 6500 K for electron densities of a few times 1012 cm−3 in the line-emitting region. The line profiles also indicate that there is an accretion-related inner disk wind. Conclusions. The data confirm that the 2008 outburst was an episode of increased accretion, albeit much stronger than previous EX Lupi and typical EXors outbursts. The line profiles are consistent with the infall/rotation of a non-axisymmetric structure that could be produced by clumpy accretion during the outburst phase. A strong inner disk wind appears in the epochs of higher accretion. The rapid recovery of the system after the outburst and the similarity between the pre-outburst and post-outburst states suggest that the accretion channels are similar during the whole period, and only the accretion rate varies, providing a superb environment for studying the accretion processesA.S.-A. acknowledges support by the Deutsche Forschungsgemeinschaft, grant number SI 1486/1-1, and the Spanish “Ramón y Cajal” program, funded by the MICINN.ESODepartamento de Física TeóricaFacultad de Ciencias20122012-08-10research articlehttp://purl.org/coar/resource_type/c_2df8fbb1VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10486/662230https://dx.doi.org/10.1051/0004-6361/201118555reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6622302026-06-23T12:46:27Z
dc.title.none.fl_str_mv Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
title Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
spellingShingle Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
Sicilia-Aguilar, Aurora
Line: profiles
Protoplanetary disks
Stars: individual: EX Lupi
Stars: low-mass
Stars: pre-main sequence
Stars: variables: T Tauri, Herbig Ae/Be
Física
title_short Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
title_full Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
title_fullStr Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
title_full_unstemmed Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
title_sort Optical spectroscopy of EX Lupi during quiescence and outburst: Infall, wind, and dynamics in the accretion flow
dc.creator.none.fl_str_mv Sicilia-Aguilar, Aurora
Kóspál, Ågnes
Setiawan, Johny
Ábrahám, Péter
Dullemond, Cornelis
Eiroa, Carlos
Goto, Miwa
Henning, Th.
Juhász, Attila
author Sicilia-Aguilar, Aurora
author_facet Sicilia-Aguilar, Aurora
Kóspál, Ågnes
Setiawan, Johny
Ábrahám, Péter
Dullemond, Cornelis
Eiroa, Carlos
Goto, Miwa
Henning, Th.
Juhász, Attila
author_role author
author2 Kóspál, Ågnes
Setiawan, Johny
Ábrahám, Péter
Dullemond, Cornelis
Eiroa, Carlos
Goto, Miwa
Henning, Th.
Juhász, Attila
author2_role author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Departamento de Física Teórica
Facultad de Ciencias
dc.subject.none.fl_str_mv Line: profiles
Protoplanetary disks
Stars: individual: EX Lupi
Stars: low-mass
Stars: pre-main sequence
Stars: variables: T Tauri, Herbig Ae/Be
Física
topic Line: profiles
Protoplanetary disks
Stars: individual: EX Lupi
Stars: low-mass
Stars: pre-main sequence
Stars: variables: T Tauri, Herbig Ae/Be
Física
description Astronomy and Astrophysics 544 (2012): A93 Reproduced with permission from Astronomy & Astrophysics
publishDate 2012
dc.date.none.fl_str_mv 2012
2012-08-10
dc.type.none.fl_str_mv research article
http://purl.org/coar/resource_type/c_2df8fbb1
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/662230
https://dx.doi.org/10.1051/0004-6361/201118555
url http://hdl.handle.net/10486/662230
https://dx.doi.org/10.1051/0004-6361/201118555
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv ESO
publisher.none.fl_str_mv ESO
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15.300719

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