Physics
Scientific paper
Dec 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996icar..124..616e&link_type=abstract
Icarus, Volume 124, Issue 2, pp. 616-624.
Physics
9
Scientific paper
Spectra of Uranus and Neptune have been obtained in the 190-310 GHz frequency range (i.e., 6.3-10.3 cm^-1, wavelength range 1.0-1.5 mm), with a Fourier transform spectrometer at the Caltech Submillimeter Observatory. The data, with a spectral resolution of 7.2 GHz, were analyzed in a search for CO and PH_3. Neither the CO (2-1) transition at 230 GHz nor the PH_3 (1-0) transition at 267 GHz were detected. The absence of a detectable absorption feature at the position of the CO (2-1) line favors a CO tropospheric mixing ratio lower than 5 x 10^-7 in Uranus and 1.0 x 10^-6 in Neptune (3sigma limits). In the case of Neptune, a tropospheric mixing ratio of 6 x 10^-7 seems to be in best agreement with all the existing low resolution data for CO. In the case of Uranus, a PH_3 enrichment by more than a factor of 4 can be excluded. There is no evidence for strong PH_3 supersaturation in either Uranus or Neptune.
Encrenaz Th.
Serabyn Eugen
Weisstein Eric Wolfgang
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