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The atmospheres of rocky exoplanets: I. Outgassing of common rock and the stability of liquid water by Herbort, O.; Woitke, P.; Helling, Ch.; Zerkle, A. is a Physics and Astronomy article available to read on EtoBox.

What is The atmospheres of rocky exoplanets: I. Outgassing of common rock and the stability of liquid water about?

Context. Little is known about the interaction between atmospheres and crusts of exoplanets so far, but future space missions and ground-based instruments are expected to detect molecular features in the spectra of hot rocky exoplanets. Aims. We aim to understand the composition of the gas in an exoplanet atmosphere which is in equilibrium with a planetary crust. Methods. The molecular composition of the gas above a surface made of a mixture of solid and liquid materials was determined by assuming phase equilibrium for given pressure, temperature, and element abundances. We study total element abundances that represent different parts of the Earth’s crust (continental crust, bulk silicate Earth, mid oceanic ridge basalt), CI chondrites and abundances measured in polluted white dwarfs. Results. For temperatures between ~600 and ~3500 K, the near-crust atmospheres of all considered total element abundances are mainly composed of H~2~O, CO~2~, and SO~2~ and in some cases of O~2~ and H~2~. For temperatures ≲500 K, only N~2~-rich or CH~4~-rich atmospheres remain. For ≳3500 K, the atmospheric gas is mainly composed of atoms (O, Na, Mg, and Fe), metal oxides (SiO, NaO, MgO, CaO, AlO, and

Who reads The atmospheres of rocky exoplanets: I. Outgassing of common rock and the stability of liquid water?

Author

Herbort, O.; Woitke, P.; Helling, Ch.; Zerkle, A.

Publisher

EDP Sciences (ISSN 0004-6361)

Published

2020

Language

EN

Field

Physics and Astronomy (Physical Sciences)