Shocked H2O ice: Thermal emission measurements and the criteria for phase changes during impact events

Details Shocked H2O ice: Thermal emission measurements and the criteria for phase changes during impact events Shocked H2O ice: Thermal emission measurements and the criteria for phase changes during impact events

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008georl..3523203s&link_type=abstract

Geophysical Research Letters, Volume 35, Issue 23, CiteID L23203

Physics

15

Mineral Physics: Equations Of State, Mineral Physics: Shock Wave Experiments, Planetary Sciences: Solid Surface Planets: Impact Phenomena, Cratering (6022, 8136), Planetary Sciences: Solid Surface Planets: Physical Properties Of Materials, Planetary Sciences: Solid Surface Planets: Ices

Scientific paper

Impact cratering events on icy planetary bodies may produce transient liquid water and vapor. We present the first thermal emission measurements from shocked H2O ice and derive peak and post-shock temperatures. Under shock pressures between 8.2 and 13.6 GPa, initially ~165 K ice is heated to between 673 and 1055 K. In the time frame of the experiment, the shocked H2O releases to the saturation vapor curve and does not achieve full decompression. The temperature results are used to validate the new 5-Phase H2O model equation of state (EOS). The 5-Phase EOS is used to predict the critical shock pressures required to induce melting and vaporization of ice for a wide range of ambient pressures and temperatures. Impact events with velocities as low as ~1 km/s will initiate phase changes on icy surfaces. Thus, shock-induced melting and vaporization of ice is a widespread process in the solar system.

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