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Shock Pressure Distribution Due to a Planetary Impact

Presentation #203.01 in the session Planets and Satellites Dynamics (Oral Presentation)

Published onOct 23, 2023
Shock Pressure Distribution Due to a Planetary Impact

The surface environments on young terrestrial planets may be characterized by impacts of minor bodies. We carried out iSALE simulations for such high-velocity impacts and obtained the amount of vapor and melt, using a sophisticated solid EOS model, ANEOS. Such a high-speed impact induces a shock wave and its propagation increases pressure, temperature, density, etc. The rise of pressure and internal energy mainly determine melting and vaporization of solid material. We thus obtained the distribution of shock pressure and internal energy. The shock pressure and internal energy are constant around impact points, while decrease with distance in a larger scale. The decreases are described by power-law formulae, and the power-law exponents are different for shock pressure and internal energy. We could analytically derive the internal energy distribution under the thermal pressure dominated assumption. In addition, we also analytical derive the pressure distribution including cold pressure iteratively. This solution allows us to obtain the amount of vapor and melt, which can reproduce the results of simulations.

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