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Thermonuclear X-ray bursts with late secondary peaks observed from 4U 1608–52

Thermonuclear X-ray bursts with late secondary peaks observed from 4U 1608–52
Thermonuclear X-ray bursts with late secondary peaks observed from 4U 1608–52
We report the temporal and spectral analysis of three thermonuclear X-ray bursts from 4U 1608−52, observed by the Neutron Star Interior Composition Explorer (NICER) during and just after the outburst observed from the source in 2020. In two of the X-ray bursts, we detect secondary peaks 30 and 18 s after the initial peaks. The secondary peaks show a fast rise exponential decay-like shape resembling a thermonuclear X-ray burst. Time-resolved X-ray spectral analysis reveals that the peak flux, blackbody temperature, and apparent emitting radius values of the initial peaks are in agreement with X-ray bursts previously observed from 4U 1608−52, while the same values for the secondary peaks tend toward the lower end of the distribution of bursts observed from this source. The third X-ray burst, which happened during much lower accretion rates, did not show any evidence for a deviation from an exponential decay and was significantly brighter than the previous bursts. We present the properties of the secondary peaks and discuss the events within the framework of short recurrence time bursts or bursts with secondary peaks. We find that the current observations do not fit in standard scenarios and challenge our understanding of flame spreading.
0004-637X
Güver, Tolga
42c68e75-5602-4ddf-a230-07264c1308f4
Boztepe, Tuğba
cf8284ac-461e-4d1d-a0aa-49d5a9a1146b
Göğüş, Ersin
d447db28-9064-4194-931e-0b6a5d796f46
Chakraborty, Manoneeta
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Strohmayer, Tod E.
b575d756-cb37-4dd2-8347-988017ddcb5e
Bult, Peter
8306a3c0-8aac-4761-b719-4d5d2b40d066
Altamirano, Diego
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Jaisawal, Gaurava K.
d6ef00c4-a934-4fa2-88d8-f3a1c2b29a5e
Kocabıyık, Tuğçe
a70406ea-d91c-4d74-8b14-772ec6c447cc
Malacaria, C.
98e428d9-76cc-4cb2-9451-dbdc956505b1
Güver, Tolga
42c68e75-5602-4ddf-a230-07264c1308f4
Boztepe, Tuğba
cf8284ac-461e-4d1d-a0aa-49d5a9a1146b
Göğüş, Ersin
d447db28-9064-4194-931e-0b6a5d796f46
Chakraborty, Manoneeta
4ec9d011-0e2b-4989-9810-6466863b9105
Strohmayer, Tod E.
b575d756-cb37-4dd2-8347-988017ddcb5e
Bult, Peter
8306a3c0-8aac-4761-b719-4d5d2b40d066
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Jaisawal, Gaurava K.
d6ef00c4-a934-4fa2-88d8-f3a1c2b29a5e
Kocabıyık, Tuğçe
a70406ea-d91c-4d74-8b14-772ec6c447cc
Malacaria, C.
98e428d9-76cc-4cb2-9451-dbdc956505b1

Güver, Tolga, Boztepe, Tuğba, Göğüş, Ersin, Chakraborty, Manoneeta, Strohmayer, Tod E., Bult, Peter, Altamirano, Diego, Jaisawal, Gaurava K., Kocabıyık, Tuğçe and Malacaria, C. (2021) Thermonuclear X-ray bursts with late secondary peaks observed from 4U 1608–52. The Astrophysical Journal, 910 (1), [37].

Record type: Article

Abstract

We report the temporal and spectral analysis of three thermonuclear X-ray bursts from 4U 1608−52, observed by the Neutron Star Interior Composition Explorer (NICER) during and just after the outburst observed from the source in 2020. In two of the X-ray bursts, we detect secondary peaks 30 and 18 s after the initial peaks. The secondary peaks show a fast rise exponential decay-like shape resembling a thermonuclear X-ray burst. Time-resolved X-ray spectral analysis reveals that the peak flux, blackbody temperature, and apparent emitting radius values of the initial peaks are in agreement with X-ray bursts previously observed from 4U 1608−52, while the same values for the secondary peaks tend toward the lower end of the distribution of bursts observed from this source. The third X-ray burst, which happened during much lower accretion rates, did not show any evidence for a deviation from an exponential decay and was significantly brighter than the previous bursts. We present the properties of the secondary peaks and discuss the events within the framework of short recurrence time bursts or bursts with secondary peaks. We find that the current observations do not fit in standard scenarios and challenge our understanding of flame spreading.

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Thermonuclear X-Ray Bursts with Late Secondary Peaks Observed from 4U 1608–52 - Accepted Manuscript
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More information

Accepted/In Press date: 27 January 2021
e-pub ahead of print date: 24 March 2021
Additional Information: ARXIV IS AM

Identifiers

Local EPrints ID: 448788
URI: http://eprints.soton.ac.uk/id/eprint/448788
ISSN: 0004-637X
PURE UUID: fe438d1d-0fb6-479f-a9d3-05d79dc180d7
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

Catalogue record

Date deposited: 05 May 2021 16:56
Last modified: 26 Nov 2021 03:02

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Contributors

Author: Tolga Güver
Author: Tuğba Boztepe
Author: Ersin Göğüş
Author: Manoneeta Chakraborty
Author: Tod E. Strohmayer
Author: Peter Bult
Author: Gaurava K. Jaisawal
Author: Tuğçe Kocabıyık
Author: C. Malacaria

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