Radiation pressure on dust aggregates in circumstellar disks |
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| Institution: | 1. International Laboratory of Landscape Ecology, National Research University Higher School of Economics, Moscow 101000, Russia;2. Faculty of Geography, Lomonosov Moscow State University, Moscow 119991, Russia;3. Faculty of Geography and Geoinformatics, National Research University Higher School of Economics, Moscow 101000, Russia;1. Sir Harry Ricardo Laboratories, Centre for Automotive Engineering, School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, UK;2. Laboratory of Multiphase Flows, Institute of Mechanics, Lomonosov Moscow State University, Moscow 119192, Russia |
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| Abstract: | We apply the ballistic particle-cluster and cluster-cluster aggregation of spherical monomers identical in size and material composition to study the effect of the particle's shape and structure on the radiation pressure force acting on circumstellar dust particles. Furthermore, the influence of the material composition on the radiation pressure is investigated based on the assumption that the constituents of dust aggregates are composed of either silicate or carbon.We show that the ratio of radiation pressure to stellar gravity in the radial direction from a star is weaker for aggregates than for homogeneous spherical grains in the radius range of submicron or less. Therefore fluffy dust particles of submicron radius have a longer dynamical lifetime, compared to compact spherical particles. We also show that the nonradial component of the radiation pressure force can reach the same order of magnitude as the radial component of the radiation pressure reduced by stellar gravity for aggregates of submicron or less in size. This non-radial component of the radiation pressure may yield a component of random motion along the trajectories of the particles. |
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