arxiv: 1310.7549 · v2 · pith:5526R7E3new · submitted 2013-10-28 · 🌌 astro-ph.HE

A New Accretion Disk Around the Missing Link Binary System PSR J1023+0038

A. Patruno (Leiden/ASTRON) , A.M. Archibald (ASTRON) , J.W.T. Hessels (ASTRON/Amsterdam) , S. Bogdanov (Columbia) , B.W. Stappers (Manchester) , C.G. Bassa (ASTRON) , G.H. Janssen (ASTRON) , V.M. Kaspi (McGill)

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S. Tendulkar (Caltech) A.G. Lyne (Manchester)

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keywords systemaccretionradiox-raydiskbinaryj1023observations

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PSR J1023+0038 is an exceptional system for understanding how slowly rotating neutron stars are spun up to millisecond rotational periods through accretion from a companion star. Observed as a radio pulsar from 2007-2013, optical data showed that the system had an accretion disk in 2000/2001. Starting at the end of 2013 June, the radio pulsar has become undetectable, suggesting a return to the previous accretion-disk state, where the system more closely resembles an X-ray binary. In this Letter we report the first targeted X-ray observations ever performed of the active phase and complement them with UV/Optical and radio observations collected in 2013 October. We find strong evidence that indeed an accretion disk has recently formed in the system and we report the detection of fast X-ray changes spanning about two orders of magnitude in luminosity. No radio pulsations are seen during low flux states in the X-ray light-curve or at any other times.

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A New Accretion Disk Around the Missing Link Binary System PSR J1023+0038

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