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Title: Experimental study on bouncing barriers in protoplanetary disks

For dust aggregates in protoplanetary disks, a transition between sticking and bouncing in individual collisions at mm to cm sizes has been observed in the past. This leads to the notion of a bouncing barrier for which growth gets stalled. Here, we present long-term laboratory experiments on the outcome of repeated aggregate collisions at the bouncing barrier. About 100 SiO{sub 2} dust aggregates 1 mm in size were observed interacting with each other. Collisions occurred within a velocity range from below mm s{sup –1} up to cm s{sup –1}. Aggregates continuously interacted with each other over a period of 900 s. During this time, more than 10{sup 5} collisions occurred. Nearly 2000 collisions were analyzed in detail. No temporal stable net growth of larger aggregates was observed even though sticking collision occurred. Larger ensembles of aggregates sticking together were formed but were disassembled again during further collisional evolution. The concept of a bouncing barrier supports the formation of planetesimals by seeded collisional growth, as well as by gravitational instability favoring a significant total mass being limited to certain size ranges. Within our parameter set, the experiments confirm that bouncing barriers are one possible and likely evolutionary limit of self-consistent particlemore » growth.« less
Authors:
; ;  [1]
  1. Faculty of Physics, University Duisburg-Essen, Lotharstr. 1, D-47057 Duisburg (Germany)
Publication Date:
OSTI Identifier:
22351571
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 783; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COLLISIONS; DIFFUSION BARRIERS; DUSTS; EVOLUTION; GRAVITATIONAL INSTABILITY; MASS; PARTICLES; PLANETS; PROTOPLANETS; SATELLITES; SILICON OXIDES; VELOCITY