Prograde highly eccentric perturbers in a ringed isothermal disc circularize and accumulate at the ring, forming a migration trap, while retrograde perturbers migrate inward without re-intersecting.
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Orbital evolution of highly eccentric bodies embedded in a ringed accretion disc
Prograde highly eccentric perturbers in a ringed isothermal disc circularize and accumulate at the ring, forming a migration trap, while retrograde perturbers migrate inward without re-intersecting.