Stokes trapping and planet formation

Details Stokes trapping and planet formation Stokes trapping and planet formation

2007-06-24

arxiv.org/abs/0706.3536v2

Astrophys. J. Suppl. Ser. 176, 484 (2008)

Astronomy and Astrophysics

Astrophysics

30 pages, 4 figures. Revised version has improved concluding remarks, extended discussion of sticking velocity

Scientific paper

10.1086/533533

It is believed that planets are formed by aggregation of dust particles suspended in the turbulent gas forming accretion disks around developing stars. We describe a mechanism, termed 'Stokes trapping', by which turbulence limits the growth of aggregates of dust particles, so that their Stokes number (defined as the ratio of the damping time of the particles to the Kolmogorov dissipation timescale) remains close to unity. We discuss possible mechanisms for avoiding this barrier to further growth. None of these is found to be satisfactory and we introduce a new theory which does not involve the growth of small clusters of dust grains.

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