A new equation of state for dense hydrogen-helium mixtures II: taking into account hydrogen-helium interactions

Abstract

In a recent paper (Chabrier et al. 2019), we have derived a new equation of state (EOS) for dense hydrogen/helium mixtures which covers the temperature-density domain from solar-type stars to brown dwarfs and gaseous planets. This EOS is based on the so-called additive volume law and thus does not take into account the interactions between the hydrogen and helium species. In the present paper, we go beyond these calculations by taking into account H/He interactions, derived from quantum molecular dynamics simulations. These interactions, which eventually lead to H/He phase separation, become important at low temperature and high density, in the domain of brown dwarfs and giant planets. The tables of this new EOS are made publicly available.

arXiv commentTo be published in The Astrophysical Journal

References in corpus (14)

• The chemical composition of the Sun
• Evolutionary models for cool brown dwarfs and extrasolar giant planets. The case of HD 20945
• New evolutionary models for pre-main sequence and main sequence low-mass stars down to the hydrogen-burning limit
• Evolutionary models for very-low-mass stars and brown dwarfs with dusty atmospheres
• A new set of atmosphere and evolution models for cool T-Y brown dwarfs and giant exoplanets
• Path Integral Monte Carlo Calculation of the Deuterium Hugoniot
• Hydrogen-Helium Mixtures in the Interiors of Giant Planets
• New models of Jupiter in the context of Juno and Galileo
• A new equation of state for dense hydrogen-helium mixtures
• Ab Initio Equation of State for Hydrogen-Helium Mixtures with Recalibration of the Giant-Planet Mass-Radius Relation
• Equation of state of fully ionized electron-ion plasmas
• Jupiter internal structure: the effect of different equations of state
• Analysis of laser shock experiments on precompressed samples using a quartz reference and application to warm dense hydrogen and helium
• Influence of finite temperature Exchange-Correlation effects in Hydrogen

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