COSMIC DUST AGGREGATION WITH STOCHASTIC CHARGING
COSMIC DUST AGGREGATION WITH STOCHASTIC CHARGING
复制标题
随机充电的宇宙尘埃聚集
DOI：
10.1088/0004-637x/776/2/103
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
T. Hyde
中科院分区：
文献类型：
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作者：
L. Matthews;B. Shotorban;T. Hyde
宇宙尘埃颗粒的凝聚是发生在天体物理环境中的一个基本过程，如太阳系前星云、星周盘和原行星盘。宇宙尘埃颗粒可以通过与其等离子体环境或其他过程的相互作用而带电，尘埃颗粒之间产生的静电力可以强烈地影响它们的凝固速率。由于离子和电子以随机的时间间隔聚集在尘埃颗粒表面，因此尘埃颗粒的电荷经历随机波动。在这项研究中，我们建立了一套随机微分方程来模拟不规则形状的聚集体表面上的这些波动。然后，利用所得到的数据，考察了电荷波动对凝聚过程和形成的聚集体物理特性的影响。结果表明，电荷小的尘埃（由于尘埃颗粒小或等离子体环境稀薄）受到的影响最大。
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.