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We investigate via numerical modeling the effects of two planets locked inresonance, and migrating outward, on the dust distribution of the natalcircumstellar disk. We aim to test whether the dust distribution exhibitspeculiar features arising from the interplay among the gravitationalperturbations of the planets in resonance, the evolution of the gas, and itsinfluence on the dust grains' dynamics. We focus on the 3:2 and 2:1 resonance,where the trapping may be caused by the convergent migration of a Jupiter- andSaturn-mass planet, preceding the common gap formation and ensuing outward (orinward) migration. Models show that a common gap also forms in the dustcomponent -- similarly to what a single, more massive planet would generate --and that outward migration leads to a progressive widening of the dust gap andto a decoupling from the gas gap. As the system evolves, a significantly widergap is observed in the dust distribution, which ceases to overlap with the gasgap in the inner disk regions. At the outer edge of the gas gap, outwardmigration of the planets produces an over-density of dust particles, whichevolve differently in the 3:2 and 2:1 resonances. For the 3:2, the dust trap atthe gap's outer edge is partly efficient and a significant fraction of thegrains filters through the gap. For the 2:1 resonance, the trap is moreefficient and very few grains cross the gap, while the vast majority accumulateat the outer edge of the gap.

Circumstellar dust distribution in systems with two planets in resonance