NEW MEASUREMENTS OF HD ON JUPITER

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1977

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Ohio State University

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The ratios of deuterium to hydrogen in the planets constitute important constraints for models of their evolution from the primitive solar nebula. This ratio is most accurately estimated for the major planets from measurements of the $HD/H_{2}$ ratio in their visible atmospheres, since molecular hydrogen predominates and this ratio is least affected among the observed hydrogen bearing molecular species by the poorly known details of the atmospheres. The HD abundance, as first measured by Trauger et al.,$^{1}$ was based on observations of a single absorption line due to the 4--0 P(1) transition in HD, since other lines sought at the time (4--0 R(0) and R(1) were found to be blended with stronger but previously unobserved $CH_{4}$ lines. In observations at the Mt. Wilson 1.5 meter telescope with a PEPSIOS spectrometer during the period 1--10 Dec. 1976, we extended the search to the 4--0 P(2) and 5--0 R(1) lines of HD to confirm the identification of the previously observed 4--0 P(1) feature, and improved the accuracy of the original measurement with further observations. A revised D/H ratio based in part on these new observations and on new laboratory data for the HD absorption strengths will be presented, and consequences for planetary evolution discussed.

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$^{1}$J. T. Trauger, F. L. Roesler, N. P. Carleton, and W. A. Traub, Astrophys. J. 184, L137 (1973). This work was supported by the NSF Atmospheric Research Section.
Author Institution: Department of Physics, University of Wisconsin

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