Collisional Growth and Fragmentation of Dust Aggregates with Low Mass Ratios. I: Critical Collision Velocity for Water Ice

Abstract

We investigated fundamental processes of collisional sticking and fragmentation of dust aggregates by carrying out N-body simulations of submicron-sized icy dust monomers. We examined the condition for collisional growth of two colliding dust aggregates in a wide range of the mass ratio, 1-64. We found that the mass transfer from a larger dust aggregate to a smaller one is a dominant process in collisions with a mass ratio of 2-30 and impact velocity of \approx 30-170 m s^-1. As a result, the critical velocity, v_fra, for fragmentation of the largest body is considerably reduced for such unequal-mass collisions; v_fra of collisions with a mass ratio of 3 is about half of that obtained from equal-mass collisions. The impact velocity is generally higher for collisions between dust aggregates with higher mass ratios because of the difference between the radial drift velocities in the typical condition of protoplanetary disks. Therefore, the reduced v_fra for unequal-mass collisions would delay growth of dust grains in the inner region of protoplanetary disks.

33 pages, 17 figures, 3 tables, accepted for publication in ApJ

References in corpus (13)

• Coagulation, fragmentation and radial motion of solid particles in protoplanetary disks
• Gas- and dust evolution in protoplanetary disks
• Closed-form expressions for particle relative velocities induced by turbulence
• The stickiness of micrometer-sized water-ice particles
• Evolution of Protoplanetary Discs with Magnetically Driven Disc Winds
• Can dust coagulation trigger streaming instability?
• ALMA Reveals Transition of Polarization Pattern with Wavelength in HL Tau's Disk
• High Velocity Dust Collisions: Forming Planetesimals in a Fragmentation Cascade with Final Accretion
• Submillimeter polarization observation of the protoplanetary disk around HD 142527
• Erosion and the limits to planetesimal growth
• Nonsticky Ice at the Origin of the Uniformly Polarized Submillimeter Emission from the HL Tau Disk
• Effect of dust size and structure on scattered light images of protoplanetary discs
• Rocky Planetesimal Formation via Fluffy Aggregates of Nanograins

Cited by in corpus (19)

• Dust growth and evolution in protoplanetary disks
• Leaky dust traps: How fragmentation impacts dust filtering by planets
• How large are the monomers of dust aggregates in planet-forming disks?: Insights from quantitative optical and near-infrared polarimetry
• Size Dependence of the Bouncing Barrier in Protoplanetary Dust Growth
• Dust coagulation and fragmentation in a collapsing cloud core and their influence on non-ideal magnetohydrodynamic effects
• Collisional Growth and Fragmentation of Dust Aggregates. II. Mass Distribution of Icy Fragments
• Grain Growth During Protostellar Disk Formation
• Impacts of viscous dissipation on collisional growth and fragmentation of dust aggregates
• Impact of turbulence intensity and fragmentation velocity on dust particle size evolution and non-ideal magnetohydrodynamics effects
• Threshold velocity for collisional growth of porous dust aggregates consisting of cohesive frictionless spheres
• Nonlinear Outcome of Coagulation Instability in Protoplanetary Disks II: Dust Ring Formation Mediated by Backreaction and Fragmentation
• Collisional growth efficiency of dust aggregates and its independence of the strength of interparticle rolling friction
• Dust Dynamics in Transitional Disks: Clumping and Disk Recession
• On the elastoplastic behavior in collisional compression of spherical dust aggregates
• Ionizing Protoplanetary Disks in Pebble Collisions
• Molecular dynamics simulations of head-on low-velocity collisions between particles
• Dust-driven vortex cascades originating at water snow regions: A pathway to planetesimal formation
• Numerical Investigation on the Compressive Behavior of Hierarchical Granular Piles
• Planetesimal gravitational collapse in a gaseous environment: Thermal and dynamic evolution