Authors:

Gregorio Lince

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About Paper:

Collisions among planetesimals are a likely source of the atomic and molecular gases detected in many relatively young debris disks. The fraction of silicate vapor that re-condenses, as well as resulting spherule size, are not well known for sub-kilometer impactors. We extend the one- dimensional Lagrangian hydrocode developed by Johnson and Melosh, where silica ANEOS and homogeneous nucleation theory are coupled to simulate projectiles from 10 km down to 1 mm at 16-50 km/s. After verifying the benchmark ~250 um spherules formed at a 10 km, 21 km/s collisions, we find that spherule size is smaller in the outer layers of the plume, and a linear dependence on impactor size is observed, as well as a complex one on impactor velocity. Size-velocity and condensed-mass- velocity provide quantitative evidence of whether collisional vapor can account for the amount of gas present in debris disks. Keywords: Spherule; Impact Processes; Cratering; Earth; Nucleation

Source:

Purdue University / 2025

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Co-authors:

Gregorio Lince