Numerical simulation of dust aggregate collisions. II. compression and disruption of three-dimensional aggregates in head-on collisions

Kon Wada, Hidekazu Tanaka, Toru Suyama, Hiroshi Kimura, Tetsuo Yamamoto

Research output: Contribution to journalArticlepeer-review

113 Citations (Scopus)

Abstract

We study collisions between dust aggregates to construct a model of their structural evolution in protoplanetary disks. We carry out three-dimensional simulations of aggregate collisions and examine their compression and disruption processes following our previous two-dimensional simulations. We take clusters of ballistic cluster-cluster aggregation (BCCA) formed by a hit-and-stick process as initial structures and study their head-on collisions with the use of realistic binding forces. Our numerical results indicate that the energy criteria for compression and disruption of BCCA clusters are consistent with previous two-dimensional simulations. For aggregate compression at a collision, we succeed in obtaining a scaling law in which the gyration radius of the resultant aggregate is proportional to Eimp-0.10, where Eimp is the impact energy. Furthermore, we derive an "equation of state" of aggregates which reproduces the scaling law for compression. The equation of state is useful for describing the density evolution of dust aggregates during their growth.

Original languageEnglish
Pages (from-to)1296-1308
Number of pages13
JournalAstrophysical Journal
Volume677
Issue number2
DOIs
Publication statusPublished - 2008 Apr 20
Externally publishedYes

Keywords

  • Circumstellar matter
  • Dust, extinction
  • Methods: N-body simulations
  • Planetary systems: formation
  • Planetary systems: protoplanetary disks

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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