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On the 2018 outburst of the accreting millisecond X-ray pulsar Swift J1756.9-2508 as seen with NICER

On the 2018 outburst of the accreting millisecond X-ray pulsar Swift J1756.9-2508 as seen with NICER
On the 2018 outburst of the accreting millisecond X-ray pulsar Swift J1756.9-2508 as seen with NICER
We report on the coherent timing analysis of the 182 Hz accreting millisecond X-ray pulsar Swift J1756.9−2508 during its 2018 outburst as observed with the Neutron Star Interior Composition Explorer (NICER). Combining our NICER observations with Rossi X-ray Timing Explorerobservations of the 2007 and 2009 outbursts, we also studied the long-term spin and orbital evolution of this source. We find that the binary system is well described by a constant orbital period model, with an upper limit on the orbital period derivative of  s s−1. Additionally, we improve upon the source coordinates through astrometric analysis of the pulse arrival times, finding R.A. = 17h56m5718 ± 008 and decl. = −25°06'278 ± 35, while simultaneously measuring the long-term spin frequency derivative as  Hz s−1. We briefly discuss the implications of these measurements in the context of the wider population of accreting millisecond pulsars.
1538-4357
Bult, Peter
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Altamirano, Diego
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Arzoumanian, Zaven
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Chakrabarty, Deepto
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Gendreau, Keith C.
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Guillot, Sebastien
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Ho, Wynn C.G.
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Jaisawal, Gaurava K.
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Lentine, Steven
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Markwardt, Craig B.
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Ngo, Son N.
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Pope, John S.
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Ray, Paul S.
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Saylor, Maxine R.
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Strohmayer, Tod E.
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Bult, Peter
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Altamirano, Diego
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Arzoumanian, Zaven
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Chakrabarty, Deepto
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Gendreau, Keith C.
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Guillot, Sebastien
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Ho, Wynn C.G.
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Jaisawal, Gaurava K.
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Lentine, Steven
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Markwardt, Craig B.
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Ngo, Son N.
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Pope, John S.
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Ray, Paul S.
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Saylor, Maxine R.
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Strohmayer, Tod E.
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Bult, Peter, Altamirano, Diego, Arzoumanian, Zaven, Chakrabarty, Deepto, Gendreau, Keith C., Guillot, Sebastien, Ho, Wynn C.G., Jaisawal, Gaurava K., Lentine, Steven, Markwardt, Craig B., Ngo, Son N., Pope, John S., Ray, Paul S., Saylor, Maxine R. and Strohmayer, Tod E. (2018) On the 2018 outburst of the accreting millisecond X-ray pulsar Swift J1756.9-2508 as seen with NICER. The Astrophysical Journal, 864 (1). (doi:10.3847/1538-4357/aad5e5).

Record type: Article

Abstract

We report on the coherent timing analysis of the 182 Hz accreting millisecond X-ray pulsar Swift J1756.9−2508 during its 2018 outburst as observed with the Neutron Star Interior Composition Explorer (NICER). Combining our NICER observations with Rossi X-ray Timing Explorerobservations of the 2007 and 2009 outbursts, we also studied the long-term spin and orbital evolution of this source. We find that the binary system is well described by a constant orbital period model, with an upper limit on the orbital period derivative of  s s−1. Additionally, we improve upon the source coordinates through astrometric analysis of the pulse arrival times, finding R.A. = 17h56m5718 ± 008 and decl. = −25°06'278 ± 35, while simultaneously measuring the long-term spin frequency derivative as  Hz s−1. We briefly discuss the implications of these measurements in the context of the wider population of accreting millisecond pulsars.

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1807.09100 - Accepted Manuscript
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Accepted/In Press date: 23 July 2018
e-pub ahead of print date: 27 August 2018
Published date: 1 September 2018

Identifiers

Local EPrints ID: 423113
URI: https://eprints.soton.ac.uk/id/eprint/423113
ISSN: 1538-4357
PURE UUID: 00027f1a-0f6a-45d6-a906-b38f2f9de9bc
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074
ORCID for Wynn C.G. Ho: ORCID iD orcid.org/0000-0002-6089-6836

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Date deposited: 14 Aug 2018 16:30
Last modified: 14 Mar 2019 05:03

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Contributors

Author: Peter Bult
Author: Zaven Arzoumanian
Author: Deepto Chakrabarty
Author: Keith C. Gendreau
Author: Sebastien Guillot
Author: Wynn C.G. Ho ORCID iD
Author: Gaurava K. Jaisawal
Author: Steven Lentine
Author: Craig B. Markwardt
Author: Son N. Ngo
Author: John S. Pope
Author: Paul S. Ray
Author: Maxine R. Saylor
Author: Tod E. Strohmayer

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