The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338

Accreting millisecond X-ray pulsars (AMXPs) show burst oscillations during thermonuclear explosions of the accreted plasma that are markedly different from those observed in non-pulsating low-mass X-ray binaries. The AMXP XTE J1814-338 is known for having burst oscillations that are phase locked (co...

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Detalhes bibliográficos
Autores: Cavecchi, Y., Patruno, Alessandro
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2022
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/277972
Acesso em linha:http://hdl.handle.net/10261/277972
Access Level:acceso abierto
Palavra-chave:Accretion
Accretion discs
Stars: neutron
X-ray binaries
X-ray bursts
X-rays: individual: XTE J1848-338
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spelling The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338Cavecchi, Y.Patruno, AlessandroAccretionAccretion discsStars: neutronX-ray binariesX-ray burstsX-rays: individual: XTE J1848-338Accreting millisecond X-ray pulsars (AMXPs) show burst oscillations during thermonuclear explosions of the accreted plasma that are markedly different from those observed in non-pulsating low-mass X-ray binaries. The AMXP XTE J1814-338 is known for having burst oscillations that are phase locked (constant phase difference) and coincident with the accretion-powered pulsations during all its thermonuclear bursts but the last one. In this work, we use a coherent timing analysis to investigate this phenomenon in more detail and with higher time resolution than was done in the past. We confirm that the burst oscillation phases are, on average, phase locked to the accretion-powered pulsations. However, they also display moderate (pdbl0.1 cycles) drifts during each individual burst, showing a repeating pattern that is consistently observed according to the thermonuclear burst phase (rise, peak, tail). Despite the existence of these drifting patterns, the burst oscillation phases somehow are able to average out at almost the exact position of the accretion-powered pulsations. We provide a kinematic description of the phenomenon and review the existing models in the literature. The phenomenon remains without a clear explanation, but we can place important constraints on the thermonuclear burst mechanism. In particular, the observations imply that the ignition point of the thermonuclear burst occurs close to the foot of the accretion column. We speculate that the burning fluid expands in a backward tilted accretion column trapped by the magnetic field, while at the same time the burning flame covers the surface.AP acknowledges support from a Ramon y Cajal fellowship (RYC-2017-21810).Royal Astronomical SocietyConsejo 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/10261/277972reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)InglésThe underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1093/mnras/stab3536http://doi.org/10.1093/mnras/stab3536Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/2779722026-05-22T06:33:51Z
dc.title.none.fl_str_mv The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
title The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
spellingShingle The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
Cavecchi, Y.
Accretion
Accretion discs
Stars: neutron
X-ray binaries
X-ray bursts
X-rays: individual: XTE J1848-338
title_short The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
title_full The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
title_fullStr The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
title_full_unstemmed The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
title_sort The peculiar behaviour of burst oscillations in the accreting millisecond X-ray pulsar XTE J1814-338
dc.creator.none.fl_str_mv Cavecchi, Y.
Patruno, Alessandro
author Cavecchi, Y.
author_facet Cavecchi, Y.
Patruno, Alessandro
author_role author
author2 Patruno, Alessandro
author2_role author
dc.contributor.none.fl_str_mv Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Accretion
Accretion discs
Stars: neutron
X-ray binaries
X-ray bursts
X-rays: individual: XTE J1848-338
topic Accretion
Accretion discs
Stars: neutron
X-ray binaries
X-ray bursts
X-rays: individual: XTE J1848-338
description Accreting millisecond X-ray pulsars (AMXPs) show burst oscillations during thermonuclear explosions of the accreted plasma that are markedly different from those observed in non-pulsating low-mass X-ray binaries. The AMXP XTE J1814-338 is known for having burst oscillations that are phase locked (constant phase difference) and coincident with the accretion-powered pulsations during all its thermonuclear bursts but the last one. In this work, we use a coherent timing analysis to investigate this phenomenon in more detail and with higher time resolution than was done in the past. We confirm that the burst oscillation phases are, on average, phase locked to the accretion-powered pulsations. However, they also display moderate (pdbl0.1 cycles) drifts during each individual burst, showing a repeating pattern that is consistently observed according to the thermonuclear burst phase (rise, peak, tail). Despite the existence of these drifting patterns, the burst oscillation phases somehow are able to average out at almost the exact position of the accretion-powered pulsations. We provide a kinematic description of the phenomenon and review the existing models in the literature. The phenomenon remains without a clear explanation, but we can place important constraints on the thermonuclear burst mechanism. In particular, the observations imply that the ignition point of the thermonuclear burst occurs close to the foot of the accretion column. We speculate that the burning fluid expands in a backward tilted accretion column trapped by the magnetic field, while at the same time the burning flame covers the surface.
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/10261/277972
url http://hdl.handle.net/10261/277972
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv The underlying dataset has been published as supplementary material of the article in the publisher platform at DOI 10.1093/mnras/stab3536
http://doi.org/10.1093/mnras/stab3536
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Royal Astronomical Society
publisher.none.fl_str_mv Royal 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
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,81155

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