lec11_23oct2009

lec11_23oct2009 - Ge/Ay133 How do small dust grains grow in...

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Unformatted text preview: Ge/Ay133 How do small dust grains grow in protoplanetary disks? How do we go from a well mixed gas/dust grain disk: To a mature planetary system? For solids, it is helpful to distinguish amongst several regimes: m cm km moon/Mars (oligarchs) 1-10 M Earth Step #1: Growth from ~0.1 m to ~1 cm scales Need to think about how particles move in the sub-Keplerian field provided by the gas. First lets look at the radial component. Drag force on particles, c = sound speed... Stopping time (shed momentum). = particle density, gas surface density. For small particles, well coupled to gas , radial velocity is Very slow for small particles. Thus, lets think about vertical motion at a given R: The mean free path is >> the particle diameter, so in the Epstein not Stokes regime (that is, the Brownian motion case). Thus NO particle growth....
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This note was uploaded on 01/03/2012 for the course GEL 133 taught by Professor List during the Fall '10 term at Caltech.

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lec11_23oct2009 - Ge/Ay133 How do small dust grains grow in...

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