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Discovery of thermonuclear Type-I X-ray bursts from the X-ray binary MAXI J1807+132

Discovery of thermonuclear Type-I X-ray bursts from the X-ray binary MAXI J1807+132
Discovery of thermonuclear Type-I X-ray bursts from the X-ray binary MAXI J1807+132
MAXI J1807+132 is a low-mass X-ray binary (LMXB) first detected in outburst in 2017. Observations during the 2017 outburst did not allow for an unambiguous identification of the nature of the compact object. MAXI J1807+132 was detected in outburst again in 2019 and was monitored regularly with NICER. In this paper we report on five days of observations during which we detected three thermonuclear (Type-I) X-ray bursts, identifying the system as a neutron star LMXB. Time-resolved spectroscopy of the three Type-I bursts revealed typical characteristics expected for these phenomena. All three Type-I bursts show slow rises and long decays, indicative of mixed H/He fuel. We find no strong evidence that any of the Type-I bursts reached the Eddington Luminosity; however, under the assumption that the brightest X-ray burst underwent photospheric radius expansion, we estimate a
astro-ph.HE
0035-8711
261–268
Albayati, A. C.
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Altamirano, D.
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Jaisawal, G. K.
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Bult, P.
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Rapisarda, S.
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Mancuso, G. C.
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Güver, T.
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Arzoumanian, Z.
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Chakrabarty, D.
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Chenevez, J.
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Court, J. M. C.
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Gendreau, K. C.
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Guillot, S.
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Keek, L.
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Malacaria, C.
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Strohmayer, T. E.
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Albayati, A. C.
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Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Jaisawal, G. K.
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Bult, P.
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Rapisarda, S.
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Mancuso, G. C.
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Güver, T.
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Arzoumanian, Z.
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Chakrabarty, D.
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Chenevez, J.
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Court, J. M. C.
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Gendreau, K. C.
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Guillot, S.
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Keek, L.
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Malacaria, C.
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Strohmayer, T. E.
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Albayati, A. C., Altamirano, D., Jaisawal, G. K., Bult, P., Rapisarda, S., Mancuso, G. C., Güver, T., Arzoumanian, Z., Chakrabarty, D., Chenevez, J., Court, J. M. C., Gendreau, K. C., Guillot, S., Keek, L., Malacaria, C. and Strohmayer, T. E. (2020) Discovery of thermonuclear Type-I X-ray bursts from the X-ray binary MAXI J1807+132. Monthly Notices of the Royal Astronomical Society, 501 (1), 261–268. (doi:10.1093/mnras/staa3657).

Record type: Article

Abstract

MAXI J1807+132 is a low-mass X-ray binary (LMXB) first detected in outburst in 2017. Observations during the 2017 outburst did not allow for an unambiguous identification of the nature of the compact object. MAXI J1807+132 was detected in outburst again in 2019 and was monitored regularly with NICER. In this paper we report on five days of observations during which we detected three thermonuclear (Type-I) X-ray bursts, identifying the system as a neutron star LMXB. Time-resolved spectroscopy of the three Type-I bursts revealed typical characteristics expected for these phenomena. All three Type-I bursts show slow rises and long decays, indicative of mixed H/He fuel. We find no strong evidence that any of the Type-I bursts reached the Eddington Luminosity; however, under the assumption that the brightest X-ray burst underwent photospheric radius expansion, we estimate a

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2011.10448v1 - Accepted Manuscript
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Accepted/In Press date: 19 November 2020
e-pub ahead of print date: 24 November 2020
Additional Information: 9 pages, 4 figures
Keywords: astro-ph.HE

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Local EPrints ID: 448124
URI: http://eprints.soton.ac.uk/id/eprint/448124
ISSN: 0035-8711
PURE UUID: 5fa4103d-253f-44ac-a7f4-e2ebfea42209
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 01 Apr 2021 15:59
Last modified: 13 Apr 2021 01:47

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Contributors

Author: A. C. Albayati
Author: D. Altamirano ORCID iD
Author: G. K. Jaisawal
Author: P. Bult
Author: S. Rapisarda
Author: G. C. Mancuso
Author: T. Güver
Author: Z. Arzoumanian
Author: D. Chakrabarty
Author: J. Chenevez
Author: J. M. C. Court
Author: K. C. Gendreau
Author: S. Guillot
Author: L. Keek
Author: C. Malacaria
Author: T. E. Strohmayer

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