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

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