An Equation of State for Supercritical Silicate-Hydrogen Mixtures at Sub-Neptune Interior Conditions

arXiv:2608.27401 · astro-ph.EP · Submitted 2026-08-27 · Read on arXiv

astro-ph.EP

Submitted: 2026-08-27

Updated: 2026-08-27

Code: https://github.com/s-marcum/MgSiO3-H-EOS

Terminology

• Abundance — 7× in this paper · explained in 1 episode
• Ab Initio — 2× in this paper · explained in 1 episode
• Consistency — 1× in this paper · explained in 3 episodes
• Density Functional Theory (DFT) — 1× in this paper · explained in 2 episodes

Sources

• The miscibility of hydrogen and water in planetary atmospheres and interiors
• Magma ocean interactions can explain JWST observations of the sub-Neptune TOI-270 d
• Chemical equilibrium between Cores, Mantles, and Atmospheres of Super-Earths and Sub-Neptunes, and Implications for their Compositions, Interiors and Evolution
• The Influences of Hydrogen-Silicate-Iron Miscibility on the Demographics of Sub-Neptunes and Super-Earths

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