Molecular Mixtures of Relevance to Planetary Interiors

Wednesday, 17 December 2014
Edmund Richard Meyer1, Christopher Ticknor1, Lee Collins1, Joel Kress1, Mandy Bethkenhagen2, Sebastien Hamel3 and Ronald Redmer2, (1)Los Alamos National Laboratory, Los Alamos, NM, United States, (2)University of Rostock, Physics, Rostock, Germany, (3)Lawrence Livermore National Laboratory, Livermore, CA, United States
Many extra-solar planets are expected to have interiors similar to that of Neptune and Uranus. Yet, our knowledge of the inner workings of Neptune and Uranus is incomplete. Additionally, the compositions of these newly found planets will not be identical to either Neptune or Uranus. Therefore, rather than compute the EOS for each possible planetary interior, it behooves us to understand the general behavior of mixtures relevant to these interiors. We present the results of varying the concentration ratios in a mixture of Methane, Ammonia, and Water at a density of 3.0g/cc using quantum molecular dynamics simulations. We show the onset of a superionic phase of the mixtures occurs for all mixing ratios below a temperature of 4,000K. Additionally, we study the EOS and diffusive properties of one particular mixture along an isentrope of Uranus.