Detection of the Methyl Radical on Neptune

Details Detection of the Methyl Radical on Neptune Detection of the Methyl Radical on Neptune

Apr 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...515..868b&link_type=abstract

The Astrophysical Journal, Volume 515, Issue 2, pp. 868-872.

Astronomy and Astrophysics

Astronomy

31

Infrared: Solar System, Planets And Satellites: Individual (Neptune)

Scientific paper

We report the first detection of the methyl radical (CH_3) in the upper atmosphere of Neptune. Observations with the Short-Wavelength Spectrometer of the Infrared Space Observatory (ISO) satellite at a resolving power of 2200 revealed several emission features from the nu_2 Q-branch of CH_3 around 16.50 mum. The column density of methyl radicals above the 0.2 mbar level is 1.6^+1.2_-0.9x10^13 molecules cm^-2. Results are compared with predictions of photochemical models. The CH_3 abundance is mostly sensitive to the eddy mixing profile and to the poorly known methyl recombination rate at low pressure. Using Slagle et al.'s expression for this rate, the present observations imply an eddy mixing coefficient at the methane homopause in the range of 2-9x10^6 cm^2 s^-1. Recombination rates higher than used in current photochemical models would lead to larger eddy mixing coefficients.

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