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Core-envelope miscibility in sub-Neptunes and super-Earths.

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Sub-Neptunes and super-Earths may have miscible cores and envelopes. Chemical reactions between silicate and hydrogen create new species, impacting planetary evolution and potentially observable by future missions.

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Area of Science:

  • Planetary Science
  • Exoplanetology
  • Astrochemistry

Background:

  • Sub-Neptunes and super-Earths are common exoplanets with radii between Earth and Neptune.
  • Their internal structure and origin remain poorly understood.
  • Sub-Neptunes are hypothesized to have rocky cores with hydrogen-rich envelopes.

Purpose of the Study:

  • Investigate the miscibility of silicate (core) and hydrogen (envelope) at exoplanet core-envelope interface conditions.
  • Determine the nature and extent of chemical reactions between core and envelope materials.
  • Understand the implications for sub- નેptune and super-Earth evolution.

Main Methods:

  • First-principles molecular dynamics simulations.
  • Density functional theory (DFT) calculations.
  • Modeling of pressure-temperature conditions exceeding several gigapascals and several thousand kelvin.

Main Results:

  • Silicate and hydrogen are completely miscible across a wide range of plausible core-envelope conditions.
  • Extensive chemical reactions occur, forming silane, SiO, and water species.
  • Core-envelope miscibility significantly affects planetary evolution by dissolving hydrogen in the core.

Conclusions:

  • Miscibility profoundly impacts the evolution of sub-Neptunes and super-Earths.
  • Dissolving hydrogen in the core and driving core-envelope exchange alters planetary structure.
  • Formation of silane, SiO, and water may be detectable by current or future observational missions.