NOTE: A Search for New Species in Io's Extended Atmosphere

Details NOTE: A Search for New Species in Io's Extended Atmosphere NOTE: A Search for New Species in Io's Extended Atmosphere

Feb 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998icar..131..449n&link_type=abstract

Icarus, Volume 131, Issue 2, pp. 449-453.

Astronomy and Astrophysics

Astrophysics

8

Scientific paper

A sensitive search for potential atomic neutrals in Io's extended atmosphere and torus was made using the 2.1-m telescope at McDonald Observatory. Although no new atomic species were detected, our observation put stricter upper limits on many neutral species, thereby providing important insights into understanding Io's surface composition, its volcanic processes, and its atmosphere. The upper limits from our observations are factors of 20 to 50 lower than the upper limits established in 1975 (Trafton, 1976, Astrophys. J., 456, 384-392). These tighter upper limits for the abundance of metal species strongly constrain the oft-proposed sputtering of cosmic-abundance silicates as one of the dominant atmospheric source mechanisms, by implying the depletion of metal species relative to sodium on the surface of Io.

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