Breakthrough revisited: investigating the requirements for growth of dust beyond the bouncing barrier
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Peer-reviewed
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Abstract
For grain growth to proceed effectively and lead to planet formation a number
of barriers to growth must be overcome. One such barrier, relevant for compact
grains in the inner regions of the disc, is the bouncing barrier' in which large grains ($\sim$ mm size) tend to bounce off each other rather than sticking. However, by maintaining a population of small grains it has been suggested that cm-size particles may grow rapidly by sweeping up these small grains. We present the first numerically resolved investigation into the conditions under which grains may be lucky enough to grow beyond the bouncing barrier by a series of rare collisions leading to growth (so-called
breakthrough'). Our models support previous results, and show that in simple
models breakthrough requires the mass ratio at which high velocity collisions
transition to growth instead of causing fragmentation to be low,
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1365-2966
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Science and Technology Facilities Council (ST/N000927/1)
Science and Technology Facilities Council (ST/H008586/1)
Science and Technology Facilities Council (ST/M007065/1)