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Planetesimal formation: numerical modeling of particle growth, settling, and collective gas-grain interactions

Weidenschilling, S (Planetary Science Institute)
Tuesday 29 September 2009, 09:00-10:00

Seminar Room 1, Newton Institute


In a relatively quiescent solar nebula, solid particles settle to form a dense layer in the midplane. The density of this layer is set by a balance between settling and diffusion caused by shear-generated turbulence. I present results of a numerical model for the equilibrium structure of a layer of particles of arbitrary size or a mixture of sizes. Radial drift rates and relative velocities are computed. Another model includes coagulation of particles throughout the thickness of the nebula; it is used to determine timescales for growth of aggregates and their settling, and the range of impact strength necessary for the production of macroscopic bodies by collisional sticking. Finally, a model for gravitational coagulation of bodies in Keplerian orbits is used to infer consequences of initial planetesimal sizes for accretion of planetary embryos.


[ppt ]


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