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The semicentennial binary system PSR J2032+4127 at periastron: X-ray photometry, optical spectroscopy and SPH modelling

The semicentennial binary system PSR J2032+4127 at periastron: X-ray photometry, optical spectroscopy and SPH modelling
The semicentennial binary system PSR J2032+4127 at periastron: X-ray photometry, optical spectroscopy and SPH modelling
X-ray photometry and optical spectra are presented covering the periastron passage of the highly-eccentric, ~50 year binary system PSR J2032+4127 in November 2017. This system consists of a 143 ms pulsar in orbit around a massive OB star, MT 91-213. The data show dramatic changes during the encounter as the pulsar wind collided with the stellar wind. The X-ray flux rose on the approach to periastron, then underwent a major dip in the few days around periastron, and then gradually declined over the next few weeks. The optical spectroscopy revealed a steady decline in the H? line strength on the approach to periastron (from an Equivalent Width of -15A to -7A) implying a truncation of the OB star's circumstellar disk by the approaching neutron star. Smooth Particle Hydrodynamic (SPH) modelling is used here to model the system within the context of the observed behaviour and predict the geometrical configuration of the circumstellar disk with respect to the pulsar's orbit.
0035-8711
1864-1875
Coe, M.J.
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Okazaki, A.T.
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Steele, I.A.
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Ng, C.-Y.
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Ho, Wynn C.G.
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Lyne, A.G.
f0f95db0-957f-45e4-aa7f-b304d4c62586
Stappers, B.
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Johnson, T.J.
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Ray, Paul S.
565b7b0b-2ea9-439d-9805-fb62f4f21704
Kerr, M.
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Coe, M.J.
04dfb23b-1456-46a3-9242-5cee983471d5
Okazaki, A.T.
4e544762-b768-4039-b381-166f4b8e3f3f
Steele, I.A.
daa8a9f8-1b8b-4951-bb8b-c404359f2686
Ng, C.-Y.
021c9216-5d02-4f20-a215-93155d1fadd5
Ho, Wynn C.G.
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Lyne, A.G.
f0f95db0-957f-45e4-aa7f-b304d4c62586
Stappers, B.
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Johnson, T.J.
3a1b6d9b-1de4-44e9-bdfd-4e08b06e859b
Ray, Paul S.
565b7b0b-2ea9-439d-9805-fb62f4f21704
Kerr, M.
86f31459-0cab-493f-a861-b93d7a396863

Coe, M.J., Okazaki, A.T., Steele, I.A., Ng, C.-Y., Ho, Wynn C.G., Lyne, A.G., Stappers, B., Johnson, T.J., Ray, Paul S. and Kerr, M. (2019) The semicentennial binary system PSR J2032+4127 at periastron: X-ray photometry, optical spectroscopy and SPH modelling. Monthly Notices of the Royal Astronomical Society, 485 (2), 1864-1875. (doi:10.1093/mnras/stz515).

Record type: Article

Abstract

X-ray photometry and optical spectra are presented covering the periastron passage of the highly-eccentric, ~50 year binary system PSR J2032+4127 in November 2017. This system consists of a 143 ms pulsar in orbit around a massive OB star, MT 91-213. The data show dramatic changes during the encounter as the pulsar wind collided with the stellar wind. The X-ray flux rose on the approach to periastron, then underwent a major dip in the few days around periastron, and then gradually declined over the next few weeks. The optical spectroscopy revealed a steady decline in the H? line strength on the approach to periastron (from an Equivalent Width of -15A to -7A) implying a truncation of the OB star's circumstellar disk by the approaching neutron star. Smooth Particle Hydrodynamic (SPH) modelling is used here to model the system within the context of the observed behaviour and predict the geometrical configuration of the circumstellar disk with respect to the pulsar's orbit.

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Accepted/In Press date: 14 February 2019
e-pub ahead of print date: 20 February 2019
Published date: May 2019

Identifiers

Local EPrints ID: 429319
URI: https://eprints.soton.ac.uk/id/eprint/429319
ISSN: 0035-8711
PURE UUID: 269f8f9b-a531-44d4-9f86-e0e84ea3589c
ORCID for M.J. Coe: ORCID iD orcid.org/0000-0002-0763-8547
ORCID for Wynn C.G. Ho: ORCID iD orcid.org/0000-0002-6089-6836

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Date deposited: 26 Mar 2019 17:30
Last modified: 19 Jul 2019 10:14

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