37th DPS Meeting, 4-9 September 2005
Session 30 Outer Planets
Poster, Tuesday, September 6, 2005, 6:00-7:15pm, Music Lecture Room 5

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[30.09] 3 Micron High-resolution Spectroscopy of Saturn

J. H. Kim, S. J. Kim (Department of Astronomy and Space Science, Kyung Hee University, Korea), T. R. Geballe (Gemini Observatory), S. S. Kim (Department of Astronomy and Space Science, Kyung Hee University, Korea)

We acquired near-IR high-resolution spectra from the southern hemisphere of Saturn using NIRSPEC/KeckII on November 21, 2001 (UT) with a spectral resolving power of 20,000 between 2.87 and 3.54 microns. We have constructed synthetic spectra that include lines from known molecules and isotopomers of CH4, C2H2, C2H6, and PH3, in order to compare the models with the high-resolution data and with a previously obtained low-resolution spectrum from UKIRT/CGS4. Our preliminary analysis confirms the presence of emission lines of CH4 and absorption lines of CH4, C2H2, and C2H6, as well as strong absorption lines of PH3 between 3.02 and 2.92 microns above a continuum formed by the scattering of solar radiation by clouds or possibly haze particles. We derive cloud altitudes and the possible influence of haze particles on the spectra, as well as the mixing ratios of the hydrocarbon molecules and PH3 used in the model atmosphere.

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Bulletin of the American Astronomical Society, 37 #3
© 2004. The American Astronomical Soceity.