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In this paper, we study a simple model of an orbiting protoplanet in acentral magnetospheric cavity, the entry into such a cavity having beenproposed as a mechanism for halting inward orbital migration. We havecalculated the gravitational interaction of the protoplanet with themagnetosphere using a local model and determined the rate of evolution of theorbit. The interaction is found to be determined by the outward flux of MHDwaves and thus the possibility of the existence of such waves in the cavity issignificant. The estimated orbital evolution rates due to gravitational andother interactions with the magnetosphere are unlikely to be significant duringprotoplanetary disk lifetimes.Comment: Accepted for publication in A&

Protoplanet magnetosphere interactions