CaltechAUTHORS
Published November 4, 2020 | Version Published
Book Section - Chapter Open

The shock physics of giant impacts: Key requirements for the equations of state

Creators

  • 1. ROR icon University of California, Berkeley
  • 2. ROR icon California Institute of Technology
  • 3. ROR icon Sandia National Laboratories
  • 4. ROR icon Lawrence Livermore National Laboratory
  • 5. ROR icon Délégation Provence et Corse
  • 6. ROR icon Harvard University

Contributors

Abstract

We discuss major challenges in modeling giant impacts between planetary bodies, focusing on the equations of state (EOS). During the giant impact stage of planet formation, rocky planets are melted and partially vaporized. However, most EOS models fail to reproduce experimental constraints on the thermodynamic properties of the major minerals over the required phase space. Here, we present an updated version of the widely-used ANEOS model that includes a user-defined heat capacity limit in the thermal free energy term. Our revised model for forsterite (Mg₂SiO₄), a common proxy for the mantles of rocky planets, provides a better fit to material data over most of the phase space of giant impacts. We discuss the limitations of this model and the Tillotson equation of state, a commonly used alternative model.

Additional Information

© 2020 Author(s). Published by AIP Publishing. Published Online: 04 November 2020. This work was supported by the Sandia Z Fundamental Science Program; DOE-NNSA DE-NA0002937 and DE-NA0003842; NASA NNX15AH54G; NASA NNX16AP35H; UC Office of the President LFR-17-449059. Sandia National Laboratories is a multimission laboratory managed and operated by NTESS, LLC, for the DOE-NNSA under contract DE-NA0003525. Prepared by LLNL under contract DE-AC52-07NA27344. Report No. SAND2019-8839J.

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Additional details

Identifiers

Eprint ID
106450
Resolver ID
CaltechAUTHORS:20201105-094348685

Funding

Sandia Z Fundamental Science Program
Department of Energy (DOE)
DE-NA0002937
Department of Energy (DOE)
DE-NA0003842
NASA
NNX15AH54G
NASA
NNX16AP35H
University of California
LFR-17-449059
Department of Energy (DOE)
DE-NA0003525
Department of Energy (DOE)
DE-AC52-07NA27344

Dates

Created
2020-11-05
Created from EPrint's datestamp field
Updated
2022-02-02
Created from EPrint's last_modified field

Caltech Custom Metadata

Series Name
AIP Conference Proceedings
Series Volume or Issue Number
2272