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Fig. B.2

image

Dust surface density as a function of orbital distance and grain size for the disc that features α = 5 × 10−3, a water abundance of 50%, a solid-to-gas ratio of 1%, and a transition in the dust fragmentation velocity from 1 to 5 m s−1 (Fig. 3). At the location of the ice line, the maximum grain size rapidly increases by a factor of ~ 40. Since the maximum grain size is proportional to (Eq. (5)), the transition in the dust fragmentation velocity from 1 to 5 m s−1 correspondsto a change by a factor of 25. The remaining increase can be related to the gas surface density and temperaturedependence of the maximum grain size. At the ice line there is a pronounced drop in temperature, which is responsible for the sharp decrease in the aspect ratio.

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