Detection of C2H4 Neptune from ISO/PHT-S Observations

Details Detection of C2H4 Neptune from ISO/PHT-S Observations Detection of C2H4 Neptune from ISO/PHT-S Observations

Sep 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999stin...9903079s&link_type=abstract

Journal of Astrophysical and Astrophysics Letters

Astronomy and Astrophysics

Astrophysics

Ethylene, Neptune (Planet), Spectra, Radiation Transport, Radiative Transfer, Photolysis, Photochemical Reactions, Ethane, Methane, Infrared Space Observatory (Iso), Lyman Alpha Radiation, Data Reduction

Scientific paper

The 6-12 micrometer spectrum of Neptune has been recorded with the PHT-S instrument of the Infrared Space Observatory (ISO) at a resolution of 0.095 micrometer. In addition to the emissions of CH4, CH3D and C2H6 previously identified, the spectrum shows the first firm identification of ethylene C2H4. The inferred column density above the 0.2-mbar level is in the range (1.1 - 3) x 1014 molecules/cm. To produce this low amount, previous photochemical models invoked rapid mixing between the source and sink regions of C2H4. We show that this requirement can be relaxed if recent laboratory measurements of CH4 photolysis branching ratios at Lyman alpha are used.

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