Sulfur and Phosphorus Chemistry in Substellar Objects

Details Sulfur and Phosphorus Chemistry in Substellar Objects Sulfur and Phosphorus Chemistry in Substellar Objects

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005dps....37.3112v&link_type=abstract

American Astronomical Society, DPS meeting #37, #31.12; Bulletin of the American Astronomical Society, Vol. 37, p.685

Astronomy and Astrophysics

Astronomy

Scientific paper

We use thermochemical equilibrium and kinetic calculations to model sulfur and phosphorus chemistry in giant planets, brown dwarfs, and extrasolar giant planets (EGPs). The chemical speciation of sulfur and phosphorus is computed in a grid from T = 800 to 2500 K and PT = 104 to10-6 bar at various metallicities and therefore in principle the equilibrium composition may be determined for any atmospheric profile. Some of our results are presented in the accompanying figure, which illustrates the abundances of S- and P-bearing gases at equilibrium along the nominal P-T profile of the T dwarf Gliese 229B (Teff = 960 K; Marley et al. 1996, Science). This modeling is used to identify potentially observable gases and to provide constraints for atmospheric composition, structure, and opacity. Support by NASA NAG5-11958.
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