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Title: Thermodynamic properties of MgSiO 3 at super-Earth mantle conditions

Journal Article · · Physical Review B
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  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of California, Davis, CA (United States)
  3. Univ. of Rochester, NY (United States)

Recent discoveries of terrestrial exoplanets distant from our solar system motivate laboratory experiments that provide insight into their formation and thermal evolution. Using laser-driven shock wave experiments, we constrain high-temperature and high-pressure adiabats and the equation of state of MgSiO3 ,a dominant mantle constituent of terrestrial exoplanets. Critical to the development of a habitable exoplanet is the early thermal history, specifically the formation and freezing of the magma ocean and its role in enabling convection in the mantle and core. We measure the adiabatic sound speed and constrain the melt transition along the Hugoniot and find that the adiabats and melt boundary of silicate magmas are shallower than predicted. In conclusion, this suggests that small changes in the temperature of a super-Earth mantle would result in rapid melting and solidification of nearly the entire mantle.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1548350
Alternate ID(s):
OSTI ID: 1456271
Report Number(s):
LLNL-JRNL-782899; PRBMDO; 973808
Journal Information:
Physical Review B, Vol. 97, Issue 21; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 22 works
Citation information provided by
Web of Science

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Cited By (4)

Measurement of the sound speed in dense fluid deuterium along the cryogenic liquid Hugoniot journal January 2019
Magnesium oxide at extreme temperatures and pressures studied with first-principles simulations journal December 2019
Path integral Monte Carlo and density functional molecular dynamics simulations of warm dense MgSiO 3 journal January 2020
Ab initio calculations of the B1-B2 phase transition in MgO journal March 2019

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