Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-02-28
Astronomy and Astrophysics
Astrophysics
10 pages 4 figures. Accepted by Icarus 02/27/2007
Scientific paper
10.1016/j.icarus.2007.02.008
We report observations of the ro-vibronic transition of SO at 1.707 microns on Io. These data were taken while Io was eclipsed by Jupiter, on four nights between July 2000 and March 2003. We analyze these results in conjunction with a previously published night to investigate the temporal behavior of these emissions. The observations were all conducted using the near-infrared spectrometer NIRSPEC on the W.M. Keck II telescope. The integrated emitted intensity for this band varies from 0.8 x 10^27 to 2.4 x 10^27 photons/sec, with a possible link to variations in Loki's infrared brightness. The band-shapes imply rotational temperatures of 550-1000K for the emitting gas, lending further evidence to a volcanic origin for sulfur monoxide. An attempt to detect the ro-vibronic transition of SO at 0.97 microns was unsuccessful; simultaneous detection with the 1.707 micron band would permit determination of the SO column abundance.
de Pater Imke
Laver Conor
Roe Henry
Strobel Darrell
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