An experimental study of photophoresis in protoplanetary dust discs

Details An experimental study of photophoresis in protoplanetary dust discs An experimental study of photophoresis in protoplanetary dust discs

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007epsc.conf..842v&link_type=abstract

European Planetary Science Congress 2007, Proceedings of a conference held 20-24 August, 2007 in Potsdam, Germany. Online at ht

Computer Science

Scientific paper

We present experimental results on the strength of the photophoretic effect within conditions similar to the pre-solar nebula. Photophoresis happens whenever solid particles are subject to illumination while embedded within a gas. We have carried out microgravity experiments in which the photophoretic velocity of micrometer-sized dust particles was measured as a function of particle size, ambient gas pressure and light intensity, but especially for particles with various chemical compositions. The results will be discussed with respect to implications to a previously proposed size sorting capability of chondrules and a possible formation of dust-enriched inner boundaries of protoplanetary dust discs.

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