Title of article :
Comparative evolution of Jupiter and Saturn
Author/Authors :
Hubbard، نويسنده , , W.B. and Guillot، نويسنده , , T. and Marley، نويسنده , , M.S. and Burrows، نويسنده , , A. and Lunine، نويسنده , , J.I. and Saumon، نويسنده , , D.S.، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 1999
Pages :
8
From page :
1175
To page :
1182
Abstract :
We present evolutionary sequences for Jupiter and Saturn, based on new non-gray model atmospheres, which take into account the evolution of the solar luminosity and partitioning of dense components to deeper layers. The results are used to set limits on the extent to which possible interior phase separation of hydrogen and helium may have progressed in the two planets. When combined with static models constrained by the gravity field, our evolutionary calculations constrain the helium mass fraction in Jupiter to be between 0.20 and 0.27, relative to total hydrogen and helium. This is consistent with the Galileo determination. The helium mass fraction in Saturn’s atmosphere lies between 0.11 and 0.21, higher than the Voyager determination. Based on the discrepancy between the Galileo and Voyager results for Jupiter, and our models, we predict that revised observational results for Saturn will yield a higher atmospheric helium mass fraction relative to the Voyager value.
Journal title :
PLANETARY AND SPACE SCIENCE
Serial Year :
1999
Journal title :
PLANETARY AND SPACE SCIENCE
Record number :
2308585
Link To Document :
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