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astrothomas.bsky.social

@astrothomas.bsky.social

astrothomas.bsky.social @astrothomas.bsky.social · 13/12/2023

If the grains grow to large sizes, smaller particles get depleted and the cooling becomes inefficient. This is why we find that the VSI is suppressed in the outer disk regions for high fragmentation velocities.

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astrothomas.bsky.social @astrothomas.bsky.social · 13/12/2023

Fast thermal relaxation is essential for the VSI, and requires the presence of small grains. In collisions with the gas molecules they relax perturbations in temperature and make vertical gas motion possible.

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astrothomas.bsky.social @astrothomas.bsky.social · 13/12/2023

What is the impact of dust grain growth on the vertical shear instability (VSI)? @birnstiel.bsky.social, Hubert Klahr, and I found that the VSI is highly sensitive to the grain fragmentation velocity, which sets the max. particle size and thus the cooling times iopscience.iop.org/article/10.3...

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