Computer Science
Scientific paper
Sep 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997natur.389..159f&link_type=abstract
Nature, Volume 389, Issue 6647, pp. 159-162 (1997).
Computer Science
89
Scientific paper
The atmospheres of the giant planets are reducing, being mainly composed of hydrogen, helium and methane. But the rings and icy satellites that surround these planets, together with the flux of interplanetary dust, could act as important sources of oxygen, which would be delivered to the atmospheres mainly in the form of water ice or silicate dust. Here we report the detection, by infrared spectroscopy, of gaseous H2O in the upper atmospheres of Saturn, Uranus and Neptune. The implied H2O column densities are 1.5 × 1015, 9× 1013 and 3× 1014 molecules cm-2 respectively. CO2 in comparable amounts was also detected in the atmospheres of Saturn and Neptune. These observations can be accounted for by external fluxes of 105-107 H2O molecules cm-2 s-1 and subsequent chemical processing in the atmospheres. The presence of gaseous water and infalling dust will affect the photochemistry, energy budget and ionospheric properties of these atmospheres. Moreover, our findings may help to constrain the injection rate and possible activity of distant icy objects in the Solar System.
Bezard Bruno
de Graauw Th.
Encrenaz Th.
Feuchtgruber Helmut
Griffin Matt
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