Ice Grain Collisions in Comparison: CO${}_2$, H${}_2$O and their Mixtures

Abstract

Collisions of ice particles play an important role in the formation of planetesimals and comets. In recent work we showed, that CO${}_2$ ice behaves like silicates in collisions. The resulting assumption was that it should therefore stick less efficiently than H${}_2$O ice. Within this paper a quantification of the latter is presented. We used the same experimental setup to study collisions of pure CO${}_2$ ice, pure water ice and 50\% mixtures by mass between CO${}_2$ and water at 80K, 1 mbar and an average particle size of $\sim 90\mu$m. The results show a strong increase of the threshold velocity between sticking and bouncing with increasing water content. This supports the idea that water ice is favorable for early growth phases of planets in a zone within the H${}_2$O and the CO${}_2$ iceline.

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