Thermal spectrum of Uranus - Implications for large helium abundance

Details Thermal spectrum of Uranus - Implications for large helium abundance Thermal spectrum of Uranus - Implications for large helium abundance

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sci...231..836o&link_type=abstract

Science (ISSN 0036-8075), vol. 231, Feb. 21, 1986, p. 836-840.

Astronomy and Astrophysics

Astronomy

9

Abundance, Helium, Infrared Spectra, Spectrum Analysis, Temperature Distribution, Uranus Atmosphere, Astronomical Models, Planetary Temperature, Vertical Distribution, Uranus, Thermal Properties, Spectra, Helium, Abundance, Infrared, Wavelengths, Mixing Ratio, Atmosphere, Comparisons, Gases, Aerosols, Distribtuion, Models, Hypotheses, Evolution, Chemistry, Formation

Scientific paper

An analysis of the infrared spectrum of Uranus' disk between 7 micrometers and 3 millimeters suggests a volume mixing ratio for helium in the atmosphere of 40±20 percent, more than for the sun, Jupiter, or Saturn. Alternative explanations require even more extreme assumptions regarding gas abundances or aerosol vertical distribution and spectral properties. The most serious difficulty with a model containing large amounts of helium is devising a credible evolutionary or chemical model explaining the absence or segregation of so much hydrogen.

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