NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts

We present temporal and time-resolved spectral analyses of all the thermonuclear X-ray bursts observed from the neutron star low-mass X-ray binary 4U 1728-34 with NICER from 2017 June to 2019 September. In total, we detected 11 X-ray bursts from the source and performed time-resolved spectroscopy. U...

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Autores: Bostanci, Funda, Boztepe, Tugba, Güver, Tolga, Strohmayer, Tod E., Cavecchi, Yuri|||0000-0002-6447-3603, Gögüs, Ersin, Altamirano, Diego, Bult, Peter, Chakrabarty, Deepto, Guillot, Sebastien, Jaisawal, Gaurava K., Malacaria, Christian, Mancuso, Giulio C., Sanna, Andrea, Swank, Jean H.
Tipo de recurso: artículo
Fecha de publicación:2023
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/403407
Acceso en línea:https://hdl.handle.net/2117/403407
https://dx.doi.org/10.3847/1538-4357/acfc4c
Access Level:acceso abierto
Palabra clave:Neutron stars
X-ray bursts
Low-mass x-ray binary stars
Estels de neutrons
Estels binaris de raigs X
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
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spelling NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two burstsBostanci, FundaBoztepe, TugbaGüver, TolgaStrohmayer, Tod E.Cavecchi, Yuri|||0000-0002-6447-3603Gögüs, ErsinAltamirano, DiegoBult, PeterChakrabarty, DeeptoGuillot, SebastienJaisawal, Gaurava K.Malacaria, ChristianMancuso, Giulio C.Sanna, AndreaSwank, Jean H.Neutron starsX-ray burstsNeutron starsX-ray burstsLow-mass x-ray binary starsEstels de neutronsEstels binaris de raigs XÀrees temàtiques de la UPC::Física::Astronomia i astrofísicaWe present temporal and time-resolved spectral analyses of all the thermonuclear X-ray bursts observed from the neutron star low-mass X-ray binary 4U 1728-34 with NICER from 2017 June to 2019 September. In total, we detected 11 X-ray bursts from the source and performed time-resolved spectroscopy. Unlike some of the earlier results for other bursting sources from NICER, our spectral results indicate that the use of a scaling factor for the persistent emission is not statistically necessary. This is primarily a result of the strong interstellar absorption in the line of sight toward 4U 1728-34, which causes the count rates to be significantly lower at low energies. We also searched for burst oscillations and detected modulations in six different bursts at around the previously known burst oscillation frequency of 363 Hz. Finally, we report the detection of oscillations prior to two bursts at 356 and 359 Hz, respectively. This is the first time in the literature where burst oscillations are detected before the rapid rise in X-ray flux, from any known burster. These oscillations disappear as soon as the burst starts to rise and occur at a somewhat lower frequency than the oscillations we detect during the bursts.We thank the referee for valuable comments and suggestions that improved the manuscript. This work is supported by the Scientific Research Projects Coordination Unit of Istanbul University (ADEP Project No: FBA-2023-39409) and the Turkish Republic, Presidency of Strategy and Budget project, 2016K121370. Y.C. acknowledges support from the grant RYC2021-032718-I, financed by MCIN/AEI/10.13039/501100011033 and the European Union NextGenerationEU/PRTR. This work was supported by NASA through the NICER mission and the Astrophysics Explorers Program.Peer ReviewedInstitute of Physics (IOP)20232023-11-1320242024-02-28journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/403407https://dx.doi.org/10.3847/1538-4357/acfc4creponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/4034072026-05-27T15:37:01Z
dc.title.none.fl_str_mv NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
title NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
spellingShingle NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
Bostanci, Funda
Neutron stars
X-ray bursts
Neutron stars
X-ray bursts
Low-mass x-ray binary stars
Estels de neutrons
Estels binaris de raigs X
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
title_short NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
title_full NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
title_fullStr NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
title_full_unstemmed NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
title_sort NICER Observations of thermonuclear bursts from 4U 1728-34: detection of oscillations prior to the onset of two bursts
dc.creator.none.fl_str_mv Bostanci, Funda
Boztepe, Tugba
Güver, Tolga
Strohmayer, Tod E.
Cavecchi, Yuri|||0000-0002-6447-3603
Gögüs, Ersin
Altamirano, Diego
Bult, Peter
Chakrabarty, Deepto
Guillot, Sebastien
Jaisawal, Gaurava K.
Malacaria, Christian
Mancuso, Giulio C.
Sanna, Andrea
Swank, Jean H.
author Bostanci, Funda
author_facet Bostanci, Funda
Boztepe, Tugba
Güver, Tolga
Strohmayer, Tod E.
Cavecchi, Yuri|||0000-0002-6447-3603
Gögüs, Ersin
Altamirano, Diego
Bult, Peter
Chakrabarty, Deepto
Guillot, Sebastien
Jaisawal, Gaurava K.
Malacaria, Christian
Mancuso, Giulio C.
Sanna, Andrea
Swank, Jean H.
author_role author
author2 Boztepe, Tugba
Güver, Tolga
Strohmayer, Tod E.
Cavecchi, Yuri|||0000-0002-6447-3603
Gögüs, Ersin
Altamirano, Diego
Bult, Peter
Chakrabarty, Deepto
Guillot, Sebastien
Jaisawal, Gaurava K.
Malacaria, Christian
Mancuso, Giulio C.
Sanna, Andrea
Swank, Jean H.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Neutron stars
X-ray bursts
Neutron stars
X-ray bursts
Low-mass x-ray binary stars
Estels de neutrons
Estels binaris de raigs X
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
topic Neutron stars
X-ray bursts
Neutron stars
X-ray bursts
Low-mass x-ray binary stars
Estels de neutrons
Estels binaris de raigs X
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
description We present temporal and time-resolved spectral analyses of all the thermonuclear X-ray bursts observed from the neutron star low-mass X-ray binary 4U 1728-34 with NICER from 2017 June to 2019 September. In total, we detected 11 X-ray bursts from the source and performed time-resolved spectroscopy. Unlike some of the earlier results for other bursting sources from NICER, our spectral results indicate that the use of a scaling factor for the persistent emission is not statistically necessary. This is primarily a result of the strong interstellar absorption in the line of sight toward 4U 1728-34, which causes the count rates to be significantly lower at low energies. We also searched for burst oscillations and detected modulations in six different bursts at around the previously known burst oscillation frequency of 363 Hz. Finally, we report the detection of oscillations prior to two bursts at 356 and 359 Hz, respectively. This is the first time in the literature where burst oscillations are detected before the rapid rise in X-ray flux, from any known burster. These oscillations disappear as soon as the burst starts to rise and occur at a somewhat lower frequency than the oscillations we detect during the bursts.
publishDate 2023
dc.date.none.fl_str_mv 2023
2023-11-13
2024
2024-02-28
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
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 https://hdl.handle.net/2117/403407
https://dx.doi.org/10.3847/1538-4357/acfc4c
url https://hdl.handle.net/2117/403407
https://dx.doi.org/10.3847/1538-4357/acfc4c
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
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
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
Attribution 4.0 International
http://creativecommons.org/licenses/by/4.0/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv Institute of Physics (IOP)
publisher.none.fl_str_mv Institute of Physics (IOP)
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,300719

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