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The abundance profile of CO in Neptune's atmosphere |
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| Authors: | Brigette E Hesman Gary R Davis Glenn S Orton |
| Institution: | a University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E2, Canada b Joint Astronomy Centre, 660 N. A'ohoku Place, University Park, Hilo, HI 96720, USA c National Research Council of Canada, HIA, Victoria, BC V9E 2E7, Canada d Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA |
| Abstract: | The J = 3-2 rotational line of CO in Neptune has been measured using the heterodyne receiver B3 at the JCMT. The spectral resolution was 1.25 MHz and 25 tunings were used to cover a frequency range of almost 20 GHz. The measured line shape, encompassing both the broad absorption feature arising in the lower atmosphere and a narrow emission core from the upper stratosphere, indicates that the CO mole ratio is not uniform with altitude, with best-fit values of  in the upper stratosphere and 0.6±0.4×10−6 in the lower stratosphere and troposphere. The higher stratospheric abundance indicates that a dual, internal and external, origin of CO is most likely. |
| Keywords: | Abundances atmospheres Neptune atmosphere Radiative transfer Spectroscopy |
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