Physics
Scientific paper
Jan 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007esasp.643...81k&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.8
Physics
2
Scientific paper
We investigate the dynamical and collisional evolution of dust particles in the zodiacal cloud from asteroidal sources using numerical simulations that incorporate the effects of radiation pressure, Poynting-Robertson drag, solar-wind drag, planetary perturbations, and also account for particle fragmentation. We note the size dependent behaviour of the particles as a result of interparticle collisions, secular gravitational perturbations, and passage through secular resonances and jovian mean motion resonances. This implies the need to adopt a realistic size-frequency distribution that includes particles greater than 100 microns in diameter in models of the zodiacal cloud. We find that the orientation of the mean plane of symmetry of the zodiacal cloud outside 2AU is dominated by the effect of Jupiter and evolves with the jovian secular cycle. It is for this reason that we are able to distinguish the solar system dust bands from the background zodiacal cloud, although dynamical and collisional effects act to disperse the orbits of the dust band particles. The inner edge to the dust bands at about 2AU is a result of the significant effect of the nu_16 secular resonance on the dust band particle orbits. These results provide an essential basis for developing detailed models of the zodiacal cloud that reproduce its observed global asymmetries and fine structure, including the dust bands.
Dermott Stanley F.
Kehoe Thomas J. J.
Mahoney-Hopping Lauren M.
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