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Fast radio bursts (FRBs) are cosmic sources emitting millisecond-durationradio bursts. Although several hundreds FRBs have been discovered, theirphysical nature and central engine remain unclear. The variations of Faradayrotation measure and dispersion measure, due to local environment, are crucialclues to understanding their physical nature. The recent observations on therotation measure of FRB 20201124A show a significant variation on a day timescale. Intriguingly, the oscillation of rotation measure supports that thelocal contribution can change sign, which indicates the magnetic field reversalalong the line of sight. Here we present a physical model that explainsobserved characteristics of FRB 20201124A and proposes that repeating signalcomes from a binary system containing a magnetar and a Be star with a decretiondisk. When the magnetar approaches the periastron, the propagation of radiowaves through the disk of the Be star naturally leads to the observed varyingrotation measure, depolarization, large scattering timescale, and Faradayconversion. This study will prompt to search for FRB signals from Be/X-raybinaries.

Repeating fast radio burst 20201124A originates from a magnetar/Be star binary