First observation of CO at 345 GHz in the atmosphere of Saturn with the JCMT: New constraints on its origin

Details First observation of CO at 345 GHz in the atmosphere of Saturn with the JCMT: New constraints on its origin First observation of CO at 345 GHz in the atmosphere of Saturn with the JCMT: New constraints on its origin

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009icar..203..531c&link_type=abstract

Icarus, Volume 203, Issue 2, p. 531-540.

Computer Science

6

Scientific paper

We have performed the first observation of the CO(3-2) spectral line in the atmosphere of Saturn with the James Clerk Maxwell Telescope. We have used a transport model of the atmosphere of Saturn to constrain the origin of the observed CO. The CO line is best-fit when the CO is located at pressures less than (15±2) mbar with a mixing ratio of (2.5±0.6)×10-8 implying an external origin. By modeling the transport in Saturn’s atmosphere, we find that a cometary impact origin with an impact 200-350 years ago is more likely than continuous deposition by interplanetary dust particles (IDP) or local sources (rings/satellites). This result would confirm that comet impacts are relatively frequent and efficient providers of CO to the atmospheres of the outer planets. However, a diffuse and/or local source cannot be rejected, because we did not account for photochemistry of oxygen compounds. Finally, we have derived an upper limit of ˜1×10-9 on the tropospheric CO mixing ratio.

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