Biology
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p23d1735v&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #P23D-1735
Biology
[1011] Geochemistry / Thermodynamics, [1027] Geochemistry / Composition Of The Planets, [5200] Planetary Sciences: Astrobiology, [6200] Planetary Sciences: Solar System Objects
Scientific paper
Observational evidence supports the presence of very deep oceans in Europa, Ganymede, Callisto, Titan, and Enceladus. Thermal models for other bodies to be more thoroughly explored also suggest internal liquid layers in the present or past. Hydrostatic pressure at the bottom oceans in the three largest of the solar system's icy world oceans exceeds the formation pressures of high-pressure ice phases. Temperature- and pressure-dependent thermodynamic effects on fluid transport and phase stability may have profound geophysical and astrobiological implications, but experimental constraints on these properties are only now becoming available. In this context, we present equations of state for aqueous NH3 and MgSO4 derived from speeds of sound obtained by the method of impulsive stimulated scattering. Using these, we provide new constraints on the presence of liquids within ice layers at the tops and bottoms of icy world oceans.
Brown Jacqueline
Vance Stephanie
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