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

Abstract

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.

Authors:
 [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)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); German Research Foundation (DFG)
Contributing Org.:
North-German Supercomputing Alliance (HLRN) (Germany)
OSTI Identifier:
1474392
Report Number(s):
LLNL-JRNL-746469
Journal ID: ISSN 1538-3881; 930019
Grant/Contract Number:  
AC52-07NA27344; SFB 652; FOR 2440
Resource Type:
Accepted Manuscript
Journal Name:
The Astronomical Journal (Online)
Additional Journal Information:
Journal Name: The Astronomical Journal (Online); Journal Volume: 156; Journal Issue: 4; Journal ID: ISSN 1538-3881
Publisher:
IOP Publishing - AAAS
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; brown dwarfs; conduction; dense matter; equation of state; planets and satellites: interiors; planets and satellites: magnetic fields

Citation Formats

Becker, Andreas, Bethkenhagen, Mandy, Kellermann, Clemens, Wicht, Johannes, and Redmer, Ronald. Material Properties for the Interiors of Massive Giant Planets and Brown Dwarfs. United States: N. p., 2018. Web. doi:10.3847/1538-3881/aad735.
Becker, Andreas, Bethkenhagen, Mandy, Kellermann, Clemens, Wicht, Johannes, & Redmer, Ronald. Material Properties for the Interiors of Massive Giant Planets and Brown Dwarfs. United States. https://doi.org/10.3847/1538-3881/aad735
Becker, Andreas, Bethkenhagen, Mandy, Kellermann, Clemens, Wicht, Johannes, and Redmer, Ronald. Mon . "Material Properties for the Interiors of Massive Giant Planets and Brown Dwarfs". United States. https://doi.org/10.3847/1538-3881/aad735. https://www.osti.gov/servlets/purl/1474392.
@article{osti_1474392,
title = {Material Properties for the Interiors of Massive Giant Planets and Brown Dwarfs},
author = {Becker, Andreas and Bethkenhagen, Mandy and Kellermann, Clemens and Wicht, Johannes and Redmer, Ronald},
abstractNote = {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.},
doi = {10.3847/1538-3881/aad735},
journal = {The Astronomical Journal (Online)},
number = 4,
volume = 156,
place = {United States},
year = {Mon Sep 10 00:00:00 EDT 2018},
month = {Mon Sep 10 00:00:00 EDT 2018}
}

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Works referencing / citing this record:

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