CO in the troposphere of Neptune: Detection of the J = 1-0 line in absorption

Details CO in the troposphere of Neptune: Detection of the J = 1-0 line in absorption CO in the troposphere of Neptune: Detection of the J = 1-0 line in absorption

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...279..661g&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 279, no. 2, p. 661-667

Astronomy and Astrophysics

Astronomy

12

Absorption Spectra, Atmospheric Chemistry, Atmospheric Models, Carbon Monoxide, Line Spectra, Neptune Atmosphere, Radio Astronomy, Radio Spectra, Troposphere, Astronomical Interferometry, Calibrating, Mathematical Models, Millimeter Waves, Radio Receivers, Satellite Atmospheres, Uranus Atmosphere

Scientific paper

Using the Institut de Radio Astronomie Millimetrique (IRAM) interferometer, we have detected the CO J = 1-0 line in absorption in the atmosphere of Neptune. Since the linewidth predicted from other millimeter observations (Marten et al. 1993) was greater than 5 GHz at half power and the line to continuum ratio should not exceed 10%, its detection required an observational technique only possible with an interferometer associated to an accurate calibration of the receivers sideband ratio (less than 2%). Combining all errors, we have detected the line with a line to continuum ratio of 5.3 +/- 1.5%. This detection implies that CO, previously detected in the stratosphere of Neptune, is also present in the troposphere of the planet, in an amount estimated between 0.6 and 1.5 x 10-6. Implications of this result on the origin of CO in Neptune's atmosphere and on the validity of thermochemical models of the deep atmosphere of the planet are discussed. We conclude to an internal origin for CO.

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