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Title: The effect of temperature evolution on the interior structure of H{sub 2}O-rich planets

For most planets in the range of radii from 1 to 4 R {sub ⊕}, water is a major component of the interior composition. At high pressure H{sub 2}O can be solid, but for larger planets, like Neptune, the temperature can be too high for this. Mass and age play a role in determining the transition between solid and fluid (and mixed) water-rich super-Earth. We use the latest high-pressure and ultra-high-pressure phase diagrams of H{sub 2}O, and by comparing them with the interior adiabats of various planet models, the temperature evolution of the planet interior is shown, especially for the state of H{sub 2}O. It turns out that the bulk of H{sub 2}O in a planet's interior may exist in various states such as plasma, superionic, ionic, Ice VII, Ice X, etc., depending on the size, age, and cooling rate of the planet. Different regions of the mass-radius phase space are also identified to correspond to different planet structures. In general, super-Earth-size planets (isolated or without significant parent star irradiation effects) older than about 3 Gyr would be mostly solid.
Authors:
;  [1]
  1. Astronomy Department, Harvard University, Cambridge, MA 02138 (United States)
Publication Date:
OSTI Identifier:
22357292
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 784; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; EVOLUTION; FLUIDS; ICE; IRRADIATION; MASS; NEPTUNE PLANET; PHASE DIAGRAMS; PHASE SPACE; PLASMA; PRESSURE RANGE MEGA PA 10-100; SATELLITES; STARS; WATER