We will present simulation results of the flow dynamics in the
co-orbital region of a protoplanet, with an emphasis on the
evolution of its potential vorticity profile. We show that
the flow's p.v. profile develops inflexion points due to
the presence of shocks. The continuing change of the p.v. profile
eventually leads to a secondary instability, the nonlinear
outcome of which is the production of vortices. Born in the
co-orbital region, these vortices undergo close-encounters with
the planet, exerting strong torques on the planet which show
large fluctuations in the magnitude and direction. Implication
for the migration will be discussed.
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