Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Growth of Aggregates with Liquid-Like Ice-Shells in Protoplanetary Discs   During the first stages of planet formation, the collision growth of dust
aggregates in protoplanetary discs (PPDs) is interrupted at the bouncing
barrier. Dust aggregates coated by different species of ice turn out to be
helpful to shift the bouncing barrier towards larger sizes due to their
enhanced sticking properties in some cases. A rarely noticed fact is that
H$_2$O- and H$_2$O-CH$_3$OH-NH$_3$-ice behave liquid-like when UV-irradiated
within a PPD-similar environment. Dust aggregates coated by these ice species
might be damped in collisions due to the liquid-like ice-shell which would
effectively results in an increase of the sticking velocity. In this work,
collisions of dust aggregates covered by the liquid-like
H$_2$O-CH$_3$OH-NH$_3$-ice-shell are considered numerically. The coefficient of
restitution and the sticking velocity are calculated for different thicknesses
of the ice-shell. The simulation predicts that an ice-shell-thickness of few
microns would be sufficient to allow the growth of cm-sized clusters in the
PPD.

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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: bayes-an
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
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The categories of this paper are: solv-int
29
The categories of this paper are: funct-an
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The categories of this paper are: math-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: cs
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The categories of this paper are: nlin
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The categories of this paper are: ao-sci
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The categories of this paper are: math
32
The categories of this paper are: atom-ph