The Jovian ammonia abundance from interferometric observations of limb darkening at 3.4 mm |
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| Authors: | Francisco Valdes William J Welch Deborah Haber |
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| Institution: | Bell Telephone Laboratories, Holmdel, New Jersey 07733, USA;Radio Astronomy Laboratory, University of California, Berkeley, California 94720, USA |
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| Abstract: | The interferometer visibility of Jupiter, observed at a wavelength of 3.4 mm, is used to determine the global limb darkening of the planet's brightness. From a single-parameter fit to the visibility curve, we find an ammonia-to-molecular hydrogen mixing ratio of 6.4+5.1, ?1.9] × 10?5, which corresponds to 35+28, ?10]% of the solar nitrogen abundance if all of the nitrogen is in the form of ammonia. The fitting procedure uses a simple model atmosphere for the Jovian atmosphere which is based on other observations of the planet. The dependence of the result on the various model parameters is studied. |
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