Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa
Stars that pass too close to a super-massive black hole may be disrupted by strong tidal forces. OGLE16aaa is one such tidal disruption event (TDE) which rapidly brightened and peaked in the optical/UV bands in early 2016 and subsequently decayed over the rest of the year. OGLE16aaa was detected in...
| Autores: | , , , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2020 |
| País: | España |
| Institución: | Instituto Nacional de Técnica Aeroespacial (INTA) |
| Repositorio: | DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacial |
| OAI Identifier: | oai:digital.inta.es:20.500.12666/290 |
| Acceso en línea: | https://www.aanda.org/articles/aa/full_html/2020/07/aa38165-20/aa38165-20.html http://hdl.handle.net/20.500.12666/290 |
| Access Level: | acceso abierto |
| Palabra clave: | Accretion Accretion disks Black Hole Physics X rays: galaxies Galaxies: individual: OGLE16aaa |
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Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaaKajava, J. J. E.Giustini, M.Saxton, R. D.Miniutti, GiovanniAccretionAccretion disksBlack Hole PhysicsX rays: galaxiesGalaxies: individual: OGLE16aaaStars that pass too close to a super-massive black hole may be disrupted by strong tidal forces. OGLE16aaa is one such tidal disruption event (TDE) which rapidly brightened and peaked in the optical/UV bands in early 2016 and subsequently decayed over the rest of the year. OGLE16aaa was detected in an XMM-Newton X-ray observation on June 9, 2016 with a flux slightly below the Swift/XRT upper limits obtained during the optical light curve peak. Between June 16–21, 2016, Swift/XRT also detected OGLE16aaa and based on the stacked spectrum, we could infer that the X-ray luminosity had jumped up by more than a factor of ten in just one week. No brightening signal was seen in the simultaneous optical/UV data to cause the X-ray luminosity to exceed the optical/UV one. A further XMM-Newton observation on November 30, 2016 showed that almost a year after the optical/UV peak, the X-ray emission was still at an elevated level, while the optical/UV flux decay had already leveled off to values comparable to those of the host galaxy. In all X-ray observations, the spectra were nicely modeled with a 50–70 eV thermal component with no intrinsic absorption, with a weak X-ray tail seen only in the November 30 XMM-Newton observation. The late-time X-ray behavior of OGLE16aaa strongly resembles the tidal disruption events ASASSN-15oi and AT2019azh. We were able to pinpoint the time delay between the initial optical TDE onset and the X-ray brightening to 182 ± 5 days, which may possibly represent the timescale between the initial circularization of the disrupted star around the super-massive black hole and the subsequent delayed accretion. Alternatively, the delayed X-ray brightening could be related to a rapid clearing of a thick envelope that covers the central X-ray engine during the first six months.We would like to thank the referee for comments that helped to improve the manuscript. JJEK and GM acknowledges support from the Spanish MINECO grant ESP2017-86582-C4-1-R. MG acknowledges support by the "Programa de Atraccion de Talento" of the Comunidad de Madrid, grant number 2018-T1/TIC-11733. This research has been partially funded by the AEI Project No. MDM-2017-0737 Unidad de Excelencia "Maria de Maeztu" -Centro de Astrobiologia (INTA-CSIC). We acknowledge the use of public data from the Swift data archive. This work was partly based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA.Peer reviewEDP SciencesUnidad de Excelencia Científica María de Maeztu del Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737Kajava, J. J. E. [0000-0002-3010-8333]Giustini, M. [0000-0002-1329-658X]Agencia Estatal de Investigación (AEI)Comunidad de Madrid202120212020info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501application/pdfhttps://www.aanda.org/articles/aa/full_html/2020/07/aa38165-20/aa38165-20.htmlhttp://hdl.handle.net/20.500.12666/290reponame:DIGITAL.INTA Repositorio Digital del Instituto Nacional de Técnica Aeroespacialinstname:Instituto Nacional de Técnica Aeroespacial (INTA)InglésCONTRIBUCION ESPAÑOLA A LAS MISIONES ESPACIALES CRIOGENICAS SPICA Y ATHENA, POST-OPERACIONES DE HERSCHEL Y EXPLOTACION CIENTIFICA MULTIFRECUENCIAinfo:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-86582-C4-1-RAttribution-NonCommercial-NoDerivatives 4.0 International© ESO 2020https://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccessoai:digital.inta.es:20.500.12666/2902026-06-23T12:46:37Z |
| dc.title.none.fl_str_mv |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa |
| title |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa |
| spellingShingle |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa Kajava, J. J. E. Accretion Accretion disks Black Hole Physics X rays: galaxies Galaxies: individual: OGLE16aaa |
| title_short |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa |
| title_full |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa |
| title_fullStr |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa |
| title_full_unstemmed |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa |
| title_sort |
Rapid late-time X-ray brightening of the tidal disruption event OGLE16aaa |
| dc.creator.none.fl_str_mv |
Kajava, J. J. E. Giustini, M. Saxton, R. D. Miniutti, Giovanni |
| author |
Kajava, J. J. E. |
| author_facet |
Kajava, J. J. E. Giustini, M. Saxton, R. D. Miniutti, Giovanni |
| author_role |
author |
| author2 |
Giustini, M. Saxton, R. D. Miniutti, Giovanni |
| author2_role |
author author author |
| dc.contributor.none.fl_str_mv |
Unidad de Excelencia Científica María de Maeztu del Centro de Astrobiología del Instituto Nacional de Técnica Aeroespacial y CSIC, MDM-2017-0737 Kajava, J. J. E. [0000-0002-3010-8333] Giustini, M. [0000-0002-1329-658X] Agencia Estatal de Investigación (AEI) Comunidad de Madrid |
| dc.subject.none.fl_str_mv |
Accretion Accretion disks Black Hole Physics X rays: galaxies Galaxies: individual: OGLE16aaa |
| topic |
Accretion Accretion disks Black Hole Physics X rays: galaxies Galaxies: individual: OGLE16aaa |
| description |
Stars that pass too close to a super-massive black hole may be disrupted by strong tidal forces. OGLE16aaa is one such tidal disruption event (TDE) which rapidly brightened and peaked in the optical/UV bands in early 2016 and subsequently decayed over the rest of the year. OGLE16aaa was detected in an XMM-Newton X-ray observation on June 9, 2016 with a flux slightly below the Swift/XRT upper limits obtained during the optical light curve peak. Between June 16–21, 2016, Swift/XRT also detected OGLE16aaa and based on the stacked spectrum, we could infer that the X-ray luminosity had jumped up by more than a factor of ten in just one week. No brightening signal was seen in the simultaneous optical/UV data to cause the X-ray luminosity to exceed the optical/UV one. A further XMM-Newton observation on November 30, 2016 showed that almost a year after the optical/UV peak, the X-ray emission was still at an elevated level, while the optical/UV flux decay had already leveled off to values comparable to those of the host galaxy. In all X-ray observations, the spectra were nicely modeled with a 50–70 eV thermal component with no intrinsic absorption, with a weak X-ray tail seen only in the November 30 XMM-Newton observation. The late-time X-ray behavior of OGLE16aaa strongly resembles the tidal disruption events ASASSN-15oi and AT2019azh. We were able to pinpoint the time delay between the initial optical TDE onset and the X-ray brightening to 182 ± 5 days, which may possibly represent the timescale between the initial circularization of the disrupted star around the super-massive black hole and the subsequent delayed accretion. Alternatively, the delayed X-ray brightening could be related to a rapid clearing of a thick envelope that covers the central X-ray engine during the first six months. |
| publishDate |
2020 |
| dc.date.none.fl_str_mv |
2020 2021 2021 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 |
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article |
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publishedVersion |
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https://www.aanda.org/articles/aa/full_html/2020/07/aa38165-20/aa38165-20.html http://hdl.handle.net/20.500.12666/290 |
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https://www.aanda.org/articles/aa/full_html/2020/07/aa38165-20/aa38165-20.html http://hdl.handle.net/20.500.12666/290 |
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Inglés |
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Inglés |
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CONTRIBUCION ESPAÑOLA A LAS MISIONES ESPACIALES CRIOGENICAS SPICA Y ATHENA, POST-OPERACIONES DE HERSCHEL Y EXPLOTACION CIENTIFICA MULTIFRECUENCIA info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/ESP2017-86582-C4-1-R |
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Attribution-NonCommercial-NoDerivatives 4.0 International © ESO 2020 https://creativecommons.org/licenses/by-nc-nd/4.0/ info:eu-repo/semantics/openAccess |
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Attribution-NonCommercial-NoDerivatives 4.0 International © ESO 2020 https://creativecommons.org/licenses/by-nc-nd/4.0/ |
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