Total inward velocity of a dust particle (red) as a function of Stokes number τf and the corresponding gas velocity for a disc with α = 0.001 (magenta). Over-plotted are also the radial speeds of a 25 and a 50 ME planet in the same discs, assuming pure type I planetary migration. Even for the 50 ME planets, particles with τf > 0.001 drift faster than the planet and would thus accumulate at the pressure bump outside of the planetary orbit.
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