The shock physics of giant impacts: Key requirements for the equations of state
Abstract
Here, 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. Yet, most EOS models fail to reproduce experimental constraints on the thermodynamic properties of the major minerals over the required phase space. In this research, 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.
- Authors:
-
- Univ. of California, Davis, CA (United States)
- California Institute of Technology (CalTech), Pasadena, CA (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
- Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
- National Center for Scientific Research, Lyon (France)
- Harvard Univ., Cambridge, MA (United States)
- Publication Date:
- Research Org.:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of California, San Diego, La Jolla, CA (United States); Univ. of California, San Diego, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 1738918
- Alternate Identifier(s):
- OSTI ID: 1574133; OSTI ID: 1633881
- Report Number(s):
- SAND-2019-8839J
Journal ID: ISSN 0094-243X; 677980; TRN: US2205389
- Grant/Contract Number:
- AC04-94AL85000; AC52-07NA27344; NA0002937; NA0003525; NA0003842
- Resource Type:
- Accepted Manuscript
- Journal Name:
- AIP Conference Proceedings
- Additional Journal Information:
- Journal Volume: 2272; Journal Issue: 1; Conference: Shock Compression of Condensed Matter - 2019, Portland, OR (United States), 16–21 Jun 2019; Journal ID: ISSN 0094-243X
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 79 ASTRONOMY AND ASTROPHYSICS; equations of state; thermodynamic properties; planet formation; minerals
Citation Formats
Stewart, Sarah, Davies, Erik, Duncan, Megan, Lock, Simon, Root, Seth, Townsend, Joshua, Kraus, Richard, Caracas, Razvan, and Jacobsen, Stein. The shock physics of giant impacts: Key requirements for the equations of state. United States: N. p., 2020.
Web. doi:10.1063/12.0000946.
Stewart, Sarah, Davies, Erik, Duncan, Megan, Lock, Simon, Root, Seth, Townsend, Joshua, Kraus, Richard, Caracas, Razvan, & Jacobsen, Stein. The shock physics of giant impacts: Key requirements for the equations of state. United States. https://doi.org/10.1063/12.0000946
Stewart, Sarah, Davies, Erik, Duncan, Megan, Lock, Simon, Root, Seth, Townsend, Joshua, Kraus, Richard, Caracas, Razvan, and Jacobsen, Stein. Wed .
"The shock physics of giant impacts: Key requirements for the equations of state". United States. https://doi.org/10.1063/12.0000946. https://www.osti.gov/servlets/purl/1738918.
@article{osti_1738918,
title = {The shock physics of giant impacts: Key requirements for the equations of state},
author = {Stewart, Sarah and Davies, Erik and Duncan, Megan and Lock, Simon and Root, Seth and Townsend, Joshua and Kraus, Richard and Caracas, Razvan and Jacobsen, Stein},
abstractNote = {Here, 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. Yet, most EOS models fail to reproduce experimental constraints on the thermodynamic properties of the major minerals over the required phase space. In this research, 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.},
doi = {10.1063/12.0000946},
journal = {AIP Conference Proceedings},
number = 1,
volume = 2272,
place = {United States},
year = {Wed Nov 04 00:00:00 EST 2020},
month = {Wed Nov 04 00:00:00 EST 2020}
}
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