The 2022 super-Eddington outburst of the source SMC X-2

M. J. Coe; J. A. Kennea; I. M. Monageng; L. J. Townsend; D. A.H. Buckley; M. Williams; A. Udalski; P. A. Evans

doi:10.1093/mnras/stae495

The 2022 super-Eddington outburst of the source SMC X-2

M. J. Coe, J. A. Kennea, I. M. Monageng, L. J. Townsend, D. A.H. Buckley, M. Williams, A. Udalski, P. A. Evans

Astronomy & Astrophysics

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Abstract

SMC X-2 exhibits X-ray outb urst beha viour that makes it one of the most luminous X-ray sources in the Small Magellanic Cloud. In the last decade it has undergone two such massive outbursts -in 2015 and 2022. The first outburst is well reported in the literature, but the 2022 event has yet to be fully described and discussed. That is the goal of this paper. In particular, the post-peak characteristics of the two events are compared. This reveals clear similarities in decay profiles, believed to be related to different accretion mechanisms occurring at different times as the outbursts evolve. The H αemission line indicates that the Be disc undergoes complex structural variability, with evidence of warping as a result of its interaction with the neutron star. The detailed observations reported here will be important for modelling such interactions in this kind of binary systems.

Original language	English (US)
Pages (from-to)	7115-7122
Number of pages	8
Journal	Monthly Notices of the Royal Astronomical Society
Volume	528
Issue number	4
DOIs	https://doi.org/10.1093/mnras/stae495
State	Published - Mar 1 2024

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

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title = "The 2022 super-Eddington outburst of the source SMC X-2",

abstract = "SMC X-2 exhibits X-ray outb urst beha viour that makes it one of the most luminous X-ray sources in the Small Magellanic Cloud. In the last decade it has undergone two such massive outbursts -in 2015 and 2022. The first outburst is well reported in the literature, but the 2022 event has yet to be fully described and discussed. That is the goal of this paper. In particular, the post-peak characteristics of the two events are compared. This reveals clear similarities in decay profiles, believed to be related to different accretion mechanisms occurring at different times as the outbursts evolve. The H αemission line indicates that the Be disc undergoes complex structural variability, with evidence of warping as a result of its interaction with the neutron star. The detailed observations reported here will be important for modelling such interactions in this kind of binary systems.",

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doi = "10.1093/mnras/stae495",

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AU - Coe, M. J.

AU - Kennea, J. A.

AU - Monageng, I. M.

AU - Townsend, L. J.

AU - Buckley, D. A.H.

AU - Williams, M.

AU - Udalski, A.

AU - Evans, P. A.

PY - 2024/3/1

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N2 - SMC X-2 exhibits X-ray outb urst beha viour that makes it one of the most luminous X-ray sources in the Small Magellanic Cloud. In the last decade it has undergone two such massive outbursts -in 2015 and 2022. The first outburst is well reported in the literature, but the 2022 event has yet to be fully described and discussed. That is the goal of this paper. In particular, the post-peak characteristics of the two events are compared. This reveals clear similarities in decay profiles, believed to be related to different accretion mechanisms occurring at different times as the outbursts evolve. The H αemission line indicates that the Be disc undergoes complex structural variability, with evidence of warping as a result of its interaction with the neutron star. The detailed observations reported here will be important for modelling such interactions in this kind of binary systems.

AB - SMC X-2 exhibits X-ray outb urst beha viour that makes it one of the most luminous X-ray sources in the Small Magellanic Cloud. In the last decade it has undergone two such massive outbursts -in 2015 and 2022. The first outburst is well reported in the literature, but the 2022 event has yet to be fully described and discussed. That is the goal of this paper. In particular, the post-peak characteristics of the two events are compared. This reveals clear similarities in decay profiles, believed to be related to different accretion mechanisms occurring at different times as the outbursts evolve. The H αemission line indicates that the Be disc undergoes complex structural variability, with evidence of warping as a result of its interaction with the neutron star. The detailed observations reported here will be important for modelling such interactions in this kind of binary systems.

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The 2022 super-Eddington outburst of the source SMC X-2

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