Monodeuterated methane in the outer solar system. II - Its detection on Uranus at 1.6 microns

Astronomy and Astrophysics – Astronomy

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Atmospheric Composition, Deuterium Compounds, Infrared Astronomy, Methane, Uranus Atmosphere, Atmospheric Models, Line Spectra, Spectrum Analysis

Scientific paper

The authors have detected the 3ν2 band of CH3D in the spectrum of Uranus recorded with the Fourier Transform Spectrometer at the 4 m Mayall telescope of KPNO. Using a scattering-model atmosphere and spectral synthesis techniques, they derive a bulk CH3D/CH4 mixing ratio of 3.6(+3.6, -2.8)×10-4 from these observations. This suggests a deuterium enhancement in methane relative to that observed on Jupiter and Saturn.

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