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

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X-ray photometry and optical spectra are presented covering the periastron passage of the highly eccentric, similar to 50 yr binary system PSR J2032 4127 in 2017 November. 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 Ha line strength on the approach to periastron from an equivalent width of -15 to-7A implying a truncation of the OB stars circumstellar disc by the approaching neutron star. Smooth particle hydrodynamic modelling is used here to model the system within the context of the observed behaviour and predict the geometrical configuration of the circumstellar disc with respect to the pulsars orbit.

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Journal Article - Open Access

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Monthly Notices of the Royal Astronomical Society , 485, 2, 01 Jan 0001, 01 Jan 0001, [ 1 ] Univ Southampton, Sch Phys and Astron, Southampton SO17 1BJ, Hants, England[ 2 ] Hokkai Gakuen Univ, Fac Engn, Toyohira Ku, Sapporo, Hokkaido 0628605, Japan[ 3 ] Liverpool John Moores Univ, Astrophys Res Inst, Liverpool L3 5RF, Merseyside, England[ 4 ] Univ Hong Kong, Dept Phys, Hong Kong, Peoples R China[ 5 ] Haverford Coll, Dept Phys and Astron, 370 Lancaster Ave, Haverford, PA 19041 USA[ 6 ] Univ Southampton, Math Sci and STAG Res Ctr, Southampton SO17 1BJ, Hants, England[ 7 ] Univ Manchester, Sch Phys and Astron, Jodrell Bank Ctr Astrophys, Manchester M13 9PL, Lancs, England[ 8 ] George Mason Univ, Coll Sci, Fairfax, VA 22030 USA[ 9 ] US Naval Res Lab, Space Sci Div, Washington, DC 20375 USA




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