Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis

A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in the symbiotic recurrent nova T CrB. Our analysis of XMM-Newton, Swift Burst Aler...

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Detalles Bibliográficos
Publicado:	2018
Materias:	Accretion, accretion disks Binaries: symbiotic X-rays: binaries Boundary layers Accretion , accretion disks Accretion disks Association of variables Burst alert telescopes Disk instabilities Hard x-ray emission X-rays: Binaries X rays
Acceso en línea:	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v619_n_p_Luna http://hdl.handle.net/20.500.12110/paper_00046361_v619_n_p_Luna
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	paper:paper_00046361_v619_n_p_Luna
record_format	dspace
spelling	paper:paper_00046361_v619_n_p_Luna2023-06-08T14:28:25Z Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis Accretion, accretion disks Binaries: symbiotic X-rays: binaries Boundary layers Accretion , accretion disks Accretion disks Association of variables Binaries: symbiotic Burst alert telescopes Disk instabilities Hard x-ray emission X-rays: Binaries X rays A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in the symbiotic recurrent nova T CrB. Our analysis of XMM-Newton, Swift Burst Alert Telescope (BAT)/X-Ray Telescope (XRT)/UltraViolet Optical Telescope (UVOT), and the American Association of Variable Stars Observers (AAVSO) V- and B-band data indicates that during an optical brightening event that started in early 2014 (ΔV ≈ 1.5) the following occurred: (i) the hard X-ray emission as seen with BAT almost vanished; (ii) the XRT X-ray flux decreased significantly, while the optical flux remained high; (iii) the UV flux increased by at least a factor of 40 over the quiescent value; and (iv) the X-ray spectrum became much softer and a bright, new blackbody-like component appeared. We suggest that the optical brightening event, which could be a similar event to that observed about 8 years before the most recent thermonuclear outburst in 1946, is due to a disk instability. © ESO 2018. 2018 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v619_n_p_Luna http://hdl.handle.net/20.500.12110/paper_00046361_v619_n_p_Luna
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Accretion, accretion disks Binaries: symbiotic X-rays: binaries Boundary layers Accretion , accretion disks Accretion disks Association of variables Binaries: symbiotic Burst alert telescopes Disk instabilities Hard x-ray emission X-rays: Binaries X rays
spellingShingle	Accretion, accretion disks Binaries: symbiotic X-rays: binaries Boundary layers Accretion , accretion disks Accretion disks Association of variables Binaries: symbiotic Burst alert telescopes Disk instabilities Hard x-ray emission X-rays: Binaries X rays Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
topic_facet	Accretion, accretion disks Binaries: symbiotic X-rays: binaries Boundary layers Accretion , accretion disks Accretion disks Association of variables Binaries: symbiotic Burst alert telescopes Disk instabilities Hard x-ray emission X-rays: Binaries X rays
description	A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in the symbiotic recurrent nova T CrB. Our analysis of XMM-Newton, Swift Burst Alert Telescope (BAT)/X-Ray Telescope (XRT)/UltraViolet Optical Telescope (UVOT), and the American Association of Variable Stars Observers (AAVSO) V- and B-band data indicates that during an optical brightening event that started in early 2014 (ΔV ≈ 1.5) the following occurred: (i) the hard X-ray emission as seen with BAT almost vanished; (ii) the XRT X-ray flux decreased significantly, while the optical flux remained high; (iii) the UV flux increased by at least a factor of 40 over the quiescent value; and (iv) the X-ray spectrum became much softer and a bright, new blackbody-like component appeared. We suggest that the optical brightening event, which could be a similar event to that observed about 8 years before the most recent thermonuclear outburst in 1946, is due to a disk instability. © ESO 2018.
title	Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
title_short	Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
title_full	Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
title_fullStr	Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
title_full_unstemmed	Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
title_sort	dramatic change in the boundary layer in the symbiotic recurrent nova t coronae borealis
publishDate	2018
url	https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_00046361_v619_n_p_Luna http://hdl.handle.net/20.500.12110/paper_00046361_v619_n_p_Luna
_version_	1768543064283938816

Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis

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