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PSR J0636+5128 is a 2.87 ms binary millisecond pulsar (MSP) discovered by theGreen Bank Northern Celestial Cap Pulsar Survey, and possesses the thirdshortest orbital period ($P=1.6$ hour) among confirmed binary pulsars. Recentobservations reported that this source is experiencing a rapid orbitalexpansion at a rate of $\dot{P}=(1.89\pm0.05)\times 10^{-12}~\rm s\,s^{-1}$.The evaporation winds of the companion induced by the spin-down luminosity ofthe MSP may be responsible for such a positive orbital period derivative.However, our calculations show that the winds ejecting from the vicinity of thecompanion or the inner Lagrangian point can not account for the observation dueto an implausible evaporation efficiency. Assuming that the evaporation windseject from the vicinity of the MSP in the form of asymmetry disc winds oroutflow, the evaporation efficiency can be constrained to be $\sim 0.1$.Therefore, the rapidly orbital expansion detected in PSR J0636+5128 providesevidence of outflows and accretion disc around the MSP.

Rapid orbital expansion in millisecond pulsar PSR J0636+5128: evaporation winds?