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The PSR J1023+0038 binary system hosts a neutron star and a low-mass,main-sequence-like star. It switches on year timescales between states as aneclipsing radio millisecond pulsar and a low-mass X-ray binary. We present amulti-wavelength observational campaign of PSR J1023+0038 in its most recentlow-mass X-ray binary state. Two long XMM-Newton observations reveal that thesystem spends ~70% of the time in a $\approx$$3\times10^{33}$ erg/s X-rayluminosity mode, which, as shown in Archibald et al. (2014), exhibits coherentX-ray pulsations. This emission is interspersed with frequent lower flux modeintervals with $\approx$$5\times 10^{32}$ erg/s and sporadic flares reaching upto $\approx$$10^{34}$ erg/s, with neither mode showing significant X-raypulsations. The switches between the three flux modes occur on timescales oforder 10 s. In the UV and optical, we observe occasional intense flarescoincident with those observed in X-rays. Our radio timing observations revealno pulsations at the pulsar period during any of the three X-ray modes,presumably due to complete quenching of the radio emission mechanism by theaccretion flow. Radio imaging detects highly variable, flat-spectrum continuumemission from PSR J1023+0038, consistent with an origin in a weak jet-likeoutflow. Our concurrent X-ray and radio continuum data sets do not exhibit anycorrelated behavior. The observational evidence we present bears qualitativeresemblance to the behavior predicted by some existing propeller and trappeddisk accretion models although none can fully account for all aspects of therich phenomenology of this system.

Coordinated X-ray, Ultraviolet, Optical, and Radio Observations of the PSR J1023+0038 System in a Low-mass X-ray Binary State