The predicted abundances of deuterium-bearing gases in the atmospheres of Jupiter and Saturn

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Deuterium, Jupiter Atmosphere, Planetary Composition, Saturn Atmosphere, Abundance, Atmospheric Composition, Atmospheric Models, Planets, Atmosphere, Abundance, Deuterium, Gases, Jupiter, Saturn, Thermochemistry, Calculations, Isotopes, Isotopic Ratios, Chemistry, Models, Diffusion, Quenching, Fractionation, Composition, Hydrogen, Thermodynamics, Temperature, Pressure, Depth, Methane, Ammonia, Mixing, Vertical Transport, Condenstation, Clouds

Scientific paper

Results are presented for the first comprehensive set of thermochemical calculations of isotopic exchange reactions of D/H, 13C/12C, 15N/14N, and 18O/16O in the hot, deep atmospheres of Jupiter and Saturn. Baseline models consistent with the observational constraints on atmospheric thermal profiles, isotopic ratios, and chemical compositions were employed; the sensitivity of the results to variations in elemental and isotopic abundances was studied. In addition to HD and CH3D, which have already been observed, the most abundant deuterium-bearing gases in the atmosphere of Jupiter and Saturn are predicted to be HDO, NH2D, and HDS.

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