Collisional growth efficiency of dust aggregates and its independence of the strength of interparticle rolling friction

Abstract

The pairwise collisional growth of dust aggregates consisting submicron-sized grains is the first step of the planet formation, and understanding the collisional behavior of dust aggregates is therefore essential. It is known that the main energy dissipation mechanisms are the tangential frictions between particles in contact, namely, rolling, sliding, and twisting. However, there is a large uncertainty for the strength of rolling friction, and the dependence of the collisional growth condition on the strength of rolling friction was poorly understood. Here we performed numerical simulations of collisions between two equal-mass porous aggregates with various collision velocities and impact parameters, and we also changed the strength of rolling friction systematically. We found that the threshold of the collision velocity for the fragmentation of dust aggregates is nearly independent of the strength of rolling friction. This is because the total amount of the energy dissipation by the tangential frictions is nearly constant even though the strength of rolling friction is varied.

11 pages, 8 figures. Accepted for publication in ApJ. See also our previous paper arXiv:2205.13768

References in corpus (6)

• The stickiness of micrometer-sized water-ice particles
• Understanding planet formation using microgravity experiments
• Collisional Growth and Fragmentation of Dust Aggregates with Low Mass Ratios. I: Critical Collision Velocity for Water Ice
• Collisional properties of cm-sized high-porosity ice and dust aggregates and their applications to early planet formation
• On the stickiness of CO${}_2$ and H${}_2$O ice particles
• Impacts of viscous dissipation on collisional growth and fragmentation of dust aggregates

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