Oxygen on Ganymede: Laboratory Simulations

Details Oxygen on Ganymede: Laboratory Simulations Oxygen on Ganymede: Laboratory Simulations

Jul 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997dps....29.1406b&link_type=abstract

American Astronomical Society, DPS meeting #29, #14.06; Bulletin of the American Astronomical Society, Vol. 29, p.989

Astronomy and Astrophysics

Astronomy

Scientific paper

To test proposals for the origin of oxygen absorption bands in the visible reflectance spectrum of Ganymede we measured the reflectance of condensed films of pure O_2 and O_2-water mixtures and the evolution of O_2 from the films as a function of temperature. Absorption band shapes and positions for oxygen at 26 K are similar to those reported for Ganymede whereas those for the mixtures are slightly shifted. The band intensity drops by more than two orders of magnitude when the ice mixture is warmed to 100 K, although about 20% of the O_2 remains trapped in the ice, suggesting that at these temperatures O_2 molecules dissolve in the ice rather than aggregate in clusters or bubbles. The experiments suggest that the absorption bands in Ganymede's spectrum are not produced in the relatively warm surface of the satellite but in a much colder source. We discuss the possibility that the solid O_2 exists in a cold subsurface layer or in an atmospheric haze.

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