Top panel: dust surface density calculated from simulations in Pinilla et al. (2012a) and considering grain sizes (a) from 1 to 100 mm after 1 Myr of evolution. The disk hosts a massive planet at 20 AU. In the case of 1 MJup (dashed line), the peak of dust surface density is at ~ Rcav ~ 30 AU, the spectral index is α1 − 3 mm = 2.4, while for 15 MJup and the peak of the dust surface density at ~ Rcav ~ 55 AU (solid line), the spectral index is α1 − 3 mm = 2.8. The dash-dotted line represents the dust surface density with the same grain sizes in a protoplanetary disk without a planet, but after suppression of the radial drift. Bottom panel: as top panel, but for micron-sized particles.
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