Changes of high-pressure properties of methane and hydrogen hydrates at low to high temperatures and inferring interiors of icy bodies

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Methane hydrate and hydrogen hydrate have been thought to be important constituents of icy planets and their satellites such as Neptune and Titan in the solar system, as well as in vast universe as proto-stars. The interiors of these icy bodies were inferred by probes of space crafts and by theoretical calculations, but experimental conformation has been quite limited. In the research, high pressure experiments from low temperatures to high temperatures, of which conditions were comparable to those of the interiors of icy bodies, were performed with both hydrates using diamond anvil cell, He-refrigerator cryostat, and laser-heating system. New phase changes and novel properties were observed for both hydrates. On the basis of the results, the interiors of icy planets and their satellites were inferred.