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Title: Material Properties for the Interiors of Massive Giant Planets and Brown Dwarfs

Journal Article · · The Astronomical Journal (Online)
 [1];  [2];  [1];  [3];  [1]
  1. Univ. of Rostock (Germany). Dept. of Physics
  2. Univ. of Rostock (Germany). Dept. of Physics; Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  3. Max Planck Inst. for Solar System Research (MPS), Gottingen (Germany)

Here, we present thermodynamic material and transport properties for the extreme conditions prevalent in the interiors of massive giant planets and brown dwarfs. They are obtained from extensive ab initio simulations of hydrogen–helium mixtures along the isentropes of three representative objects. In particular, we determine the heat capacities, the thermal expansion coefficient, the isothermal compressibility, and the sound velocity. Important transport properties such as the electrical and thermal conductivity, opacity, and shear viscosity are also calculated. Further results for associated quantities, including magnetic and thermal diffusivity, kinematic shear viscosity, as well as the static Love number k2 and the equidistance, are presented. In comparison to Jupiter-mass planets, the behavior inside massive giant planets and brown dwarfs is stronger dominated by degenerate matter. We discuss the implications on possible dynamics and magnetic fields of those massive objects. The consistent data set compiled here may serve as a starting point to obtain material and transport properties for other substellar H–He objects with masses above one Jovian mass and finally may be used as input for dynamo simulations.

Research Organization:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); German Research Foundation (DFG)
Contributing Organization:
North-German Supercomputing Alliance (HLRN) (Germany)
Grant/Contract Number:
AC52-07NA27344; SFB 652; FOR 2440
OSTI ID:
1474392
Report Number(s):
LLNL-JRNL-746469; 930019
Journal Information:
The Astronomical Journal (Online), Vol. 156, Issue 4; ISSN 1538-3881
Publisher:
IOP Publishing - AAASCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 15 works
Citation information provided by
Web of Science

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Cited By (2)

Small Anisotropy in Stellar Objects in Modified Theories of Gravity journal October 2019
Small Anisotropy in Stellar Objects in Modified Theories of Gravity text January 2018