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Title: COSMIC DUST AGGREGATION WITH STOCHASTIC CHARGING

The coagulation of cosmic dust grains is a fundamental process which takes place in astrophysical environments, such as presolar nebulae and circumstellar and protoplanetary disks. Cosmic dust grains can become charged through interaction with their plasma environment or other processes, and the resultant electrostatic force between dust grains can strongly affect their coagulation rate. Since ions and electrons are collected on the surface of the dust grain at random time intervals, the electrical charge of a dust grain experiences stochastic fluctuations. In this study, a set of stochastic differential equations is developed to model these fluctuations over the surface of an irregularly shaped aggregate. Then, employing the data produced, the influence of the charge fluctuations on the coagulation process and the physical characteristics of the aggregates formed is examined. It is shown that dust with small charges (due to the small size of the dust grains or a tenuous plasma environment) is affected most strongly.
Authors:
;  [1] ;  [2]
  1. Center for Astrophysics, Space Physics, and Engineering Research, Baylor University, Waco, TX 76798 (United States)
  2. Department of Mechanical and Aerospace Engineering, The University of Alabama in Huntsville, Huntsville, AL 35899 (United States)
Publication Date:
OSTI Identifier:
22270787
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 776; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AGGLOMERATION; ASTRONOMY; ASTROPHYSICS; COSMIC DUST; DIFFERENTIAL EQUATIONS; FLUCTUATIONS; INTERSTELLAR GRAINS; NEBULAE; PLANETS; PLASMA; PROTOPLANETS; SATELLITES; STOCHASTIC PROCESSES