Other
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aas...187.4217n&link_type=abstract
American Astronomical Society, 187th AAS Meeting, #42.17; Bulletin of the American Astronomical Society, Vol. 27, p.1339
Other
Scientific paper
The dominant surface components of satellites in the outer solar system are water ice and dark, presumably silicaceous material in variable mixtures. These satellites surfaces are exposed to high energy ions in the magnetospheres of their primary planet. With UV spectra obtained by the Hubble Space Telescope we have detected at least two molecular absorption bands produced by the products of ion irradiation, SO_2 on Europa and O_3 on Ganymede. We compare the spectra of these two satellites to UV spectra of other ice-rich satellites Iapetus and Rhea, and to the ice-poor asteroid, Ceres. Ozone, in particular, appears to be diagnostic of ion-irradiation of ice. It is produced either directly, or indirectly by ultraviolet photolysis of O_2. Because the key ingredients are ubiquitous, we expect that objects with tenuous O_2 atmospheres, and associated O_3 will be common in extrasolar planetary systems.
Cruikshank Dale
Domingue Donovan
Johnson Rachael
Lane Arthur L.
Noll Keith S.
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