  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.
