Winfried Lorenzen

Ab Initio Simulations for Material Properties along the Jupiter Adiabat

We determine basic thermodynamic and transport properties of hydrogen-helium-water mixtures for the extreme conditions along Jupiters adiabat via ab initio simulations, which are compiled in an accurate and consistent data set. In particular, we calculate the electrical and thermal conductivity, the shear and longitudinal viscosity, and diffusion coefficients of the nuclei. We present results for associated quantities like the magnetic and thermal diffusivity and the kinematic shear viscosity along an adiabat that is taken from a state-of-the-art interior structure model. Furthermore, the heat capacities, the thermal expansion coefficient, the isothermal compressibility, the Gruneisen parameter, and the speed of sound are calculated. We find that the onset of dissociation and ionization of hydrogen at about 0.9 Jupiter radii marks a region where the material properties change drastically. In the deep interior, where the electrons are degenerate, many of the material properties remain relatively constant. Our ab initio data will serve as a robust foundation for applications that require accurate knowledge of the material properties in Jupiters interior, e.g., models for the dynamo generation.

Ab initio equations of state for hydrogen (h-reos.3) and helium (he-reos.3) and their implications for the interior of brown dwarfs

We present new equations of state (EOS) for hydrogen and helium covering a wide range of temperatures from 60 K to 10

Equation of state and optical properties of warm dense helium

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Progress in Warm Dense Matter and Planetary Physics

K and densities from

Giant planets as laboratory for high energy density physics

10^{-10}

INTERIOR OF SOLAR AND EXTRASOLAR GIANT PLANETS

g/cm

Demixing of hydrogen and helium at megabar pressures.

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First-order liquid-liquid phase transition in dense hydrogen

to

Metallization in hydrogen-helium mixtures

10^3

H/He demixing and the cooling behavior of Saturn

g/cm