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Recent observations strongly suggest that the millisecond pulsar binary PSRJ1023+0038 has developed an accretion disk since 2013 June. We present amulti-wavelength analysis of PSR J1023+0038, which reveals that 1) itsgamma-rays suddenly brightened within a few days in June/July 2013 and hasremained at a high gamma-ray state for several months; 2) both UV and X-rayfluxes have increased by roughly an order of magnitude, and 3) the spectralenergy distribution has changed significantly after the gamma-ray sudden fluxchange. Time variabilities associated with UV and X-rays are on the order of100-500 seconds and 50-100 seconds, respectively. Our model suggests that anewly formed accretion disk due to the sudden increase of the stellar windcould explain the changes of all these observed features. The increase of UV isemitted from the disk, and a new component in gamma-rays is produced by inverseCompton scattering between the new UV component and pulsar wind. The increaseof X-rays results from the enhancement of injection pulsar wind energy into theintra-binary shock due to the increase of the stellar wind. We also predictthat the radio pulses may be blocked by the evaporated winds from the disk andthe pulsar is still powered by rotation.

Multi-wavelength emissions from the millisecond pulsar binary PSR J1023+0038 during an accretion active state