The visual and near infrared spectrum of methane and its application to Uranus, Neptune, Triton and Pluto

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Infrared Spectra, Methane, Neptune (Planet), Pluto (Planet), Spectrum Analysis, Uranus (Planet), Absorption Spectra, Absorptivity, Atmospheric Composition, Dynamic Models, Planetary Atmospheres

Scientific paper

The spectrum of methane from 4000 to 10600 A with abundances up to 6 km amagat was obtained and analyzed with the Mayer-Goody random band model. Absorption coefficients were determined over the whole wavelength region. The reflection spectrum of Uranus from 4000 to 10000 A was matched with three models of increasing complexity: a reflecting layer model, a semi-infinite isotropic homogeneous scattering model and a clear atmosphere with a scattering haze near the top. The reflecting layer model does not fit well, the homogeneous scattering model leaves discrepancies in the bottoms of the strong methane bands, while the scattering haze model gives a very good fit to the spectrum. To search for atmospheres on Pluto and Triton, spectra of these objects, as well as comparison stars, were obtained with a three stage Varo image tube for the spectral region from 6800 to 9000 A.

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