Electrical Conductivity of Methane and Synthetic Uranus: Implications for the Ice Giants

Physics

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Scientific paper

The interiors of the ice giant planets, Uranus and Neptune, are composed of a mixture of water, ammonia, and methane. This mixture exists at pressures up to several hundred GPa and several thousand kelvin. To understand the behavor of the deep interior, the properties of the constituents must be understood at these extreme conditions. We report preliminary results on the electrical conductivity measuremnts of methane and "synthetic Uranus" to 180 GPa. While methane alone shows signs of chemical dissociation, the behavior of "synthetic Uranus" is scales with that of water. The implication of these measurements and our previous measurements of water on the interiors of Uranus and Neptune will be discussed. This work was performed under the auspices of the U.S. Department of Energy by University of California, Lawrence Livermore National Laboratory under contract No. W-7405-Eng-48.

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