MODELING COLLISIONAL CASCADES IN DEBRIS DISKS: THE NUMERICAL METHOD

被引：21

作者：

Gaspar, Andras ^{[1
]}

Psaltis, Dimitrios ^{[1
]}

Oezel, Feryal ^{[1
]}

Rieke, George H. ^{[1
]}

Cooney, Alan ^{[1
,2
]}

机构：

[1] Univ Arizona, Steward Observ, Tucson, AZ 85721 USA

[2] Univ Arizona, Dept Phys, Tucson, AZ 85721 USA

来源：

ASTROPHYSICAL JOURNAL | 2012年 / 749卷 / 01期

关键词：

circumstellar matter; infrared: stars; methods: numerical; planetary systems; ICE-SILICATE MIXTURES; SOLAR-TYPE STARS; SIZE DISTRIBUTIONS; PLANETARY SYSTEMS; KUIPER-BELT; AU MICROSCOPII; DUST DYNAMICS; COLD DUST; EVOLUTION; SPITZER;

D O I：

10.1088/0004-637X/749/1/14

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We develop a new numerical algorithm tomodel collisional cascades in debris disks. Because of the large dynamical range in particle masses, we solve the integro-differential equations describing erosive and catastrophic collisions in a particle-in-a-box approach, while treating the orbital dynamics of the particles in an approximate fashion. We employ a new scheme for describing erosive (cratering) collisions that yields a continuous set of outcomes as a function of colliding masses. We demonstrate the stability and convergence characteristics of our algorithm and compare it with other treatments. We show that incorporating the effects of erosive collisions results in a decay of the particle distribution that is significantly faster than with purely catastrophic collisions.

引用

页数：22

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