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Fast radio bursts (FRBs) are transient radio signals withmillisecond-duration, large dispersion measure (DM) and extremely highbrightness temperature. Among them, FRB 20180916B has been found to have a16-day periodic activity. However, the physical origin of the periodicity isstill a mystery. Here, we utilize the comprehensive observational data todiagnose the periodic models. We find that the ultra-long rotation model is themost probable one for the periodic activity. However, this model cannotreproduce the observed rotation measure (RM) variations. We propose aself-consistent model, i.e., a massive binary containing a slowly rotationalneutron star and a massive star with large mass loss, which can naturallyaccommodate the wealth of observational features for FRB 20180916B. In thismodel, the RM variation is periodic, which can be tested by futureobservations.

The physical origin of the periodic activity for FRB 20180916B