Evolution of the orbital distance of pebbles as they drift through a disc with an embedded 25 ME planet (top) and an embedded 30 ME planet (bottom). Even though the planet has generated a pressure bump outside of its orbit (maximum at r = 1.123, see Fig. 1), small pebbles with τf < 0.005 can drift through the pressure bump for the 25 ME planet, while the Stokes number of the particles has to be an order of magnitude smaller to drift through the pressure bump generated by the 30 ME planet.
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