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FRB 180916 is an important repeating fast radio burst (FRB) source.Interestingly, the activity of FRB 180916 shows a well-regulated behavior, witha period of 16.35 days. The bursts are found to occur in a duty circle of about5 days in each period. In this study, we suggest that the bursts of FRB 180916are produced by a strange star interacting with its planet. The planet moves ina highly eccentric orbit around its compact host, with the periastron onlyslightly beyond the tidal disruption radius. As a result, the planet will bepartially disrupted every time it passes through the periastron. The strippedmaterial from the planet will be accreted by the strange star, falling to thepolar cap region along the magnetic field lines and accumulated there. It willfinally lead to a local collapse when the crust at the polar region isoverloaded, triggering an FRB. The observed 16.35 day period corresponds to theorbital motion of the planet, and the 5 day duty circle is explained as theduration of the partial disruption near the periastron. The energy released ineach local collapse event can be as high as $\sim 10^{42}~\rm {erg}$, which islarge enough to account for typical FRBs even if the radiation efficiency isextremely low.

Repeating fast radio bursts produced by a strange star interacting with its planet in an eccentric orbit