Phase separation in hydrogen-helium mixtures at Mbar pressures

Proceedings of the National Academy of Sciences of the United States of America

Volumn 106, Issue 5, 2009, Pages 1324-1329

  Morales, Miguel A ^a   Schwegler, Eric ^c   Ceperley, David ^a,b   Pierleoni, Carlo ^c,d   Hamel, Sebastien ^c   Caspersen, Kyle ^c  

^a University of Illinois at Urbana Champaign   (United States)

^b UNIVERSITY OF ILLINOIS AT URBANA CHAMPAIGN   (United States)

^c LAWRENCE LIVERMORE NATIONAL LABORATORY   (United States)

^d UNIVERSITY OF L'AQUILA   (Italy)

Author keywords

Ab initio molecular dynamics; High pressure; Planetary interiors

Indexed keywords

HELIUM; HYDROGEN;

ADIABATICITY; ARTICLE; ASTRONOMY; DENSITY; ENERGY; MOLECULAR DYNAMICS; PHASE SEPARATION; PRESSURE; PRIORITY JOURNAL; SIMULATION; TEMPERATURE; THERMODYNAMICS;

EID: 60949099444     PISSN: 00278424     EISSN: 10916490     Source Type: Journal    
DOI: 10.1073/pnas.0812581106     Document Type: Article

References (24)

1. Fortney JJ, Hubbard WB (2003) Phase separation in giant planets: Inhomogeneous evolution of Saturn. Icarus 164:228-243.
2. Fortney JJ, Hubbard WB (2004) Effects of helium phase separation on the evolution of extrasolar giant planets. Astrophys J 608:1039-1049.
3. Guillot T(2005) The interiors of giant planets: Models and outstanding questions. Annu Rev Earth Planet Sci 33:493-530.
4. Hubbard WB, Burrows A, Lunine JI (2002) Theory of giant planets. Annu Rev Astron Astrophys40:103-136.
5. Hubbard WB, et.al (1999) Comparative evolution of Jupiter and Saturn. Planet Space Sci 47:1175-1182.
6. Salpeter EE (1973) On convection and gravitational layering in Jupiter and in stars of lowmass. AstrophysJ181:L83-L86.
7. Stevenson DJ (1975) Thermodynamics and phase separation of dense fully ionized hydrogen-helium fluid mixtures. Phys Rev Condens Matter B 12:3999-4007.
8. Stevenson DJ, Salpeter EE (1977) Phase diagram and transport properties for hydrogen-helium fluid planets. Astrophys J Suppl 35:221-237.
9. Stevenson DJ, Salpeter EE (1977) Dynamics and helium distribution in hydrogen- helium fluid planets. Astrophys J Suppl 35:239-261.
10. Straus DM, Ashcroft NW, Beck H (1977) Phase separation of metallic hydrogen-helium alloys. Phys Rev B 15:1914-1928.
11. Hubbard WB, DeWitt HE (1985) Statistical mechanics of light elements at high pressure. VII - A perturbative free energy for arbitrary mixtures of H and He. Astrophys J 290:388-393.
12. Klepeis JE, Schafer KJ, Barbee TW, Ross M (1991) Hydrogen D helium mixtures at megabar pressures-Implications for Jupiter and Saturn. Science 254:986-989.
13. Pfaffenzeller O, Hohl D, Ballone P (1995) Miscibility of hydrogen and helium under astrophysical conditions. Phys Rev Lett 74:2599-2602.
14. Stixrude L, Jeanloz R (2008) Fluid helium at conditions of giant planetary interiors, Proc Natl Acad Sci USA 105:11071-11075.
15. Stevenson DJ (2008) Metallic helium in massive planets, Proc Natl Acad Sci USA 105:11035-11036.
16. Bonev SA, Schwegler E, Ogitsu, Galli G (2004) A quantum fluid of metallic hydrogen suggested by first-principles calculations. Nature 431:669-672.
17. Pierleoni C, Delaney KT, Morales MA, Ceperley DM, Holzmann M (2008) Trial wave functions for high pressure metallic hydrogen. Comput Phys Commun 179:89-97.
18. Pierleoni C, Ceperley DM, Holzmann M (2004) Coupled Electron-Ion Monte Carlo calculations of dense metallic hydrogen. Phys Rev Lett 93: 146402:1-4.
19. Vorberger J, Tamblyn I, Militzer B, Bonev SA (2007) Hydrogen-helium mixtures in the interiors of giant planets. Phys Rev B 75:024206.
20. Saumon D, Chabrier G, Van Horn HM (1995) An equation of state for low-mass stars and giant planets. Astrophys J Suppl S 99:713-741.
21. Militzer B, Hubbard WB, Vorberger J, Tamblyn I, Bonev SA (2008) A massive core in jupiter predicted from first-principles simulations. Astrophys J Lett, in press.
22. Hamman DR (1989) Generalized norm-conserving pseudopotentials. Phys Rev B 40:2980-2987.
23. Troullier N, Martins JL (1991) Efficient pseudopotentials for plane-wave calculations. Phys Rev B 43:1993-2006.
24. Mehlig B, Heermann DW, Forrest BM (1992) Hybrid Monte Carlo method for condensed-matter systems. Phys Rev B 45:679-685.