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SXP 5.05 = IGR J00569-7226: using X-rays to explore the structure of a Be star’s circumstellar disk

SXP 5.05 = IGR J00569-7226: using X-rays to explore the structure of a Be star’s circumstellar disk
SXP 5.05 = IGR J00569-7226: using X-rays to explore the structure of a Be star’s circumstellar disk
On MJD 56590-1 (2013 Oct 25–26), observations of the Magellanic Clouds by the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) observatory discovered a previously unreported bright, flaring X-ray source. This source was initially given the identification IGR J00569-7226. Subsequent multiwavelength observations identified the system as new Be/X-ray binary system in the Small Magellanic Cloud (SMC). Follow-up X-ray observations by Swift and XMM–Newton revealed an X-ray pulse period of 5.05 s and that the system underwent regular occultation/eclipse behaviour every 17 d. This is the first reported eclipsing Be/X-ray binary system in the SMC, and only the second such system known to date. Furthermore, the nature of the occultation makes it possible to use the neutron star to ‘X-ray’ the circumstellar disc, thereby, for the first time, revealing direct observational evidence for its size and clumpy structure. Swift timing measurements allowed for the binary solution to be calculated from the Doppler-shifted X-ray pulsations. This solution suggests this is a low-eccentricity binary relative to others measured in the SMC. Finally, it is interesting to note that the mass determined from this dynamical method for the Be star (?13.0?M?) is significantly different from that inferred from the spectroscopic classification of B0.2Ve (?16.0?M?) – an effect that has been noted for some other high mass X-ray binary systems.
0035-8711
2387-2403
Coe, M.J.
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Bartlett, E S
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Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Haberl, F.
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Kennea, J.A.
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McBride, V.A.
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Townsend, L.J.
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Udalski, A.
a7d3b194-1531-47cd-a634-abe3b8b067b0
Coe, M.J.
04dfb23b-1456-46a3-9242-5cee983471d5
Bartlett, E S
e7d65e6a-d46d-4e49-81af-cf7a62fdb6e1
Bird, A.J.
045ee141-4720-46fd-a412-5aa848a91b32
Haberl, F.
2b5a1116-cde9-4063-b3f1-25e6768b6e88
Kennea, J.A.
5bda466b-abb9-42be-a687-4eeb9c602d67
McBride, V.A.
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Townsend, L.J.
383d1487-54d3-4912-82d3-1cc3b4b28d5e
Udalski, A.
a7d3b194-1531-47cd-a634-abe3b8b067b0

Coe, M.J., Bartlett, E S, Bird, A.J., Haberl, F., Kennea, J.A., McBride, V.A., Townsend, L.J. and Udalski, A. (2015) SXP 5.05 = IGR J00569-7226: using X-rays to explore the structure of a Be star’s circumstellar disk. Monthly Notices of the Royal Astronomical Society, 447 (3), 2387-2403. (doi:10.1093/mnras/stu2568).

Record type: Article

Abstract

On MJD 56590-1 (2013 Oct 25–26), observations of the Magellanic Clouds by the INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) observatory discovered a previously unreported bright, flaring X-ray source. This source was initially given the identification IGR J00569-7226. Subsequent multiwavelength observations identified the system as new Be/X-ray binary system in the Small Magellanic Cloud (SMC). Follow-up X-ray observations by Swift and XMM–Newton revealed an X-ray pulse period of 5.05 s and that the system underwent regular occultation/eclipse behaviour every 17 d. This is the first reported eclipsing Be/X-ray binary system in the SMC, and only the second such system known to date. Furthermore, the nature of the occultation makes it possible to use the neutron star to ‘X-ray’ the circumstellar disc, thereby, for the first time, revealing direct observational evidence for its size and clumpy structure. Swift timing measurements allowed for the binary solution to be calculated from the Doppler-shifted X-ray pulsations. This solution suggests this is a low-eccentricity binary relative to others measured in the SMC. Finally, it is interesting to note that the mass determined from this dynamical method for the Be star (?13.0?M?) is significantly different from that inferred from the spectroscopic classification of B0.2Ve (?16.0?M?) – an effect that has been noted for some other high mass X-ray binary systems.

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Accepted/In Press date: 3 December 2014
e-pub ahead of print date: 8 January 2015
Published date: 1 March 2015
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 402025
URI: http://eprints.soton.ac.uk/id/eprint/402025
ISSN: 0035-8711
PURE UUID: 3c2e4cb7-d121-432e-a1ba-7164ad8dd03f
ORCID for M.J. Coe: ORCID iD orcid.org/0000-0002-0763-8547
ORCID for A.J. Bird: ORCID iD orcid.org/0000-0002-6888-8937

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Date deposited: 26 Oct 2016 14:16
Last modified: 22 Nov 2021 02:36

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Contributors

Author: M.J. Coe ORCID iD
Author: E S Bartlett
Author: A.J. Bird ORCID iD
Author: F. Haberl
Author: J.A. Kennea
Author: V.A. McBride
Author: L.J. Townsend
Author: A. Udalski

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