Charging of aggregate grains in astrophysical environments

Qianyu Ma, L.S. Matthews, V. Land, T.W. Hyde

Research output: Contribution to journalArticleAcademicpeer-review

22 Citations (Scopus)

Abstract

The charging of dust grains in astrophysical environments has been investigated with the assumption that these grains are homogeneous spheres. However, there is evidence which suggests that many grains in astrophysical environments are irregularly shaped aggregates. Recent studies have shown that aggregates acquire higher charge-to-mass ratios due to their complex structures, which in turn may alter their subsequent dynamics and evolution. In this paper, the charging of aggregates is examined including secondary electron emission and photoemission in addition to primary plasma currents. The results show that the equilibrium charge on aggregates can differ markedly from spherical grains with the same mass, but that the charge can be estimated for a given environment based on structural characteristics of the grain. The "small particle effect" due to secondary electron emission is also important for de terming the charge of micron-sized aggregates consisting of nano-sized particles.

Original languageEnglish
Article number77
Number of pages9
JournalAstrophysical Journal
Volume763
Issue number2
DOIs
Publication statusPublished - 1 Feb 2013
Externally publishedYes

Keywords

  • dust, extinction
  • interplanetary medium
  • ISM: general
  • planets and satellites: formation
  • plasmas
  • zodiacal dust

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