Planetesimal formation in the outer solar nebula.

Physics

Scientific paper

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Solar Nebula: Planetesimals, Formation: Planetesimals

Scientific paper

A numerical investigation of the orbital trajectories of individual particles in the turbulent outer solar nebula has been performed. A particle starting out in a cool region grows via condensation and collisional accretion until it is large enough (decimeter- to meter-sized) to decouple somewhat from the turbulence. The particle then moves rapidly inward toward the Sun due to secular gas drag forces, sublimates much of its icy mantle, and slows its inward migration as it gets caught up in the turbulence again. Such a process could generate a population of decimeter- to meter-sized bodies which would then collisionally accrete to form planetesimals.

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