Miscibility of Hydrogen and Helium under Astrophysical Conditions

Details Miscibility of Hydrogen and Helium under Astrophysical Conditions Miscibility of Hydrogen and Helium under Astrophysical Conditions

Mar 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995phrvl..74.2599p&link_type=abstract

Physical Review Letters, Volume 74, Issue 13, March 27, 1995, pp.2599-2602

Physics

34

Scientific paper

We investigate the stability and structural properties of dense hydrogen-helium mixtures under planetary interior conditions (Jupiter and Saturn). The excess free energy of mixing ΔG\(x\) is determined as a function of the helium atomic fraction x by ab initio molecular dynamics simulations in the pressure range 4<=P<=24 Mbar at temperatures T<=3000 K. Energy, volume, and entropic contributions are evaluated. Demixing temperatures at x = 0.1 (the solar abundance) are 4000-9000 K (dependent on P), close to what planetary interior models predict for Saturn but well below the corresponding interior temperatures in Jupiter.

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