Hidden Water in Magma Ocean Exoplanets

被引：100

作者：

Dorn, Caroline ^{[1
]}

Lichtenberg, Tim ^{[2
]}

机构：

[1] Univ Zurich, Inst Computat Sci, Winterthurerstr 190, CH-8057 Zurich, Switzerland

[2] Univ Oxford, Dept Phys, Atmospher Ocean & Planetary Phys, Parks Rd, Oxford OX1 3PU, England

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2021年 / 922卷 / 01期

基金：

瑞士国家科学基金会;

关键词：

EQUATION-OF-STATE; 55 CNC E; TERRESTRIAL PLANETS; RUNAWAY GREENHOUSE; SUPER-EARTHS; MASS; RADIUS; MANTLE; SOLIDIFICATION; BIOSIGNATURES;

D O I：

10.3847/2041-8213/ac33af

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We demonstrate that the deep volatile storage capacity of magma oceans has significant implications for the bulk composition, interior, and climate state inferred from exoplanet mass and radius data. Experimental petrology provides the fundamental properties of the ability of water and melt to mix. So far, these data have been largely neglected for exoplanet mass-radius modeling. Here we present an advanced interior model for water-rich rocky exoplanets. The new model allows us to test the effects of rock melting and the redistribution of water between magma ocean and atmosphere on calculated planet radii. Models with and without rock melting and water partitioning lead to deviations in planet radius of up to 16% for a fixed bulk composition and planet mass. This is within the current accuracy limits for individual systems and statistically testable on a population level. Unrecognized mantle melting and volatile redistribution in retrievals may thus underestimate the inferred planetary bulk water content by up to 1 order of magnitude.

引用

页数：10

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