Bulletin of the American Physical Society
22nd Biennial Conference of the APS Topical Group on Shock Compression of Condensed Matter
Volume 67, Number 8
Monday–Friday, July 11–15, 2022; Anaheim, California
Session X00: Plenary VLive Streamed Plenary
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Chair: Arianna Gleason, SLAC - Natl Accelerator Lab Room: Anaheim Marriott Platinum 5-6 |
Friday, July 15, 2022 8:00AM - 9:00AM |
X00.00001: The Collisional Accretion of Planets: A Shock Physics Story Invited Speaker: Sarah T Stewart Collisions play a central role in the growth of rocky planets from planetesimals. As the bodies grow, the mutual impact velocities increase from a subsonic mechanical regime to a shock-induced vaporization regime at 10’s km/s. Today, the most extreme natural impact pressures can be reached at high energy facilities such as the Z machine, the Omega and Omega EP lasers, and the National Ignition Facility, and I will summarize recent advances and challenges in experimental work on probing the shock Hugoniots and phase boundaries of planetary materials using these facilities. The irreversible work deposited by the shock-and-release thermodynamic path induces widespread melting and vaporization in the colliding bodies. I will highlight recent insights on the effects of shock-induced phase changes on planetesimals, which survive as bodies in the asteroid belt, and on the origin of the Earth and Moon. |
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