Physics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007esasp.643..191w&link_type=abstract
Workshop on Dust in Planetary Systems (ESA SP-643). September 26-30 2005, Kauai, Hawaii. Editors: Krueger, H. and Graps, A., p.1
Physics
Scientific paper
There are two major sources of interplanetary dust in the Solar System: comets and asteroids. Since most of the short period comets are assumed to originate from the Kuiper belt, dust might eventually be traced back to two ring-like reservoirs -- the Kuiper belt and the asteroid belt. We have recently found that photophoresis in a late Solar Nebula might explain exactly that -- the formation of belts. Based on the only assumption that a transparent, yet gas rich protoplanetary disk existed, a concentration of solid matter in ring-like structures seems inevitable. In particular, the position of the ring(s) depends on the disk model and on the thermal, optical, and surface properties of the particles. While dust aggregates are concentrated several tens of A.U. away from the Sun, chondrules, which are found in primitive meteorites, are concentrated a few A.U. away from the Sun. This suggests that (primitive) asteroids and comets or Kuiper belt objects form rather late in protoplanetary disks by photophoretic concentration.
Krauss Oliver
Wurm Gerhard
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