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2018ApJ...857...65L - Astrophys. J., 857, 65-65 (2018/April-2)

A new desalination pump helps define the pH of ocean worlds.

LEVI A. and SASSELOV D.

Abstract (from CDS):

We study ocean exoplanets, for which the global surface ocean is separated from the rocky interior by a high-pressure ice mantle. We describe a mechanism that can pump salts out of the ocean, resulting in oceans of very low salinity. Here we focus on the H2O-NaCl system, though we discuss the application of this pump to other salts as well. We find our ocean worlds to be acidic, with a pH in the range of 2-4. We discuss and compare between the conditions found within our studied oceans and the conditions in which polyextremophiles were discovered. This work focuses on exoplanets in the super-Earth mass range (∼2 M), with water composing at least a few percent of their mass. However, the principle of the desalination pump might extend beyond this mass range.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): astrobiology - planets and satellites: interiors - planets and satellites: oceans - planets and satellites: surfaces - planets and satellites: tectonics

Simbad objects: 3

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