Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....6042k&link_type=abstract
EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #6042
Physics
Scientific paper
We study the circumstellar debris disk of beta Pictoris which is detectable by the IR-excess of the stellar brightness. The maximum of the IR-excess had been used to estimate the minimum distance that dust particles are located from the central star. This indicates the existence of a central clearance zone around the star. However, it can be an artifact of the parameter fitting that is performed without any physical consideration of dust dynamics. The formation of a central clearance zone can stem from dust sublimation, dust fragmentation by mutual collisions or dynamical effects due to the hypothesized presence of planets in the system. Fragmentation and dynamics also determine the size distribution of dust particles. We calculate the different forces that act on the particles applying different models of particle structure and composition to estimate the size spectrum of dust particles in the disk of beta Pictoris. Collisional fragmentation determines the slope of the size distribution for larger grains. Small particles are ejected by the radiation pressure force and the slope of the size distribution flattens. The size limit for which the slope changes depends on the material. We use our estimates of the size distribution and a modell of the dust spatial distribution around beta Pictoris to calculate the thermal emission which can be compared to the measured IRAS-values. First results of the model calculations around beta Pictoris will be presented.
Köhler Manuel
Mann Ian
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