Spatially Resolved Measurements of SO Emission on Io, while Eclipsed by Jupiter

Details Spatially Resolved Measurements of SO Emission on Io, while Eclipsed by Jupiter Spatially Resolved Measurements of SO Emission on Io, while Eclipsed by Jupiter

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.3005d&link_type=abstract

American Astronomical Society, DPS meeting #38, #30.05; Bulletin of the American Astronomical Society, Vol. 38, p.538

Physics

Optics

Scientific paper

We observed Io during an eclipse on 12 November 2002 (UT) with the 10-m W.M. Keck II telescope, equipped with NIRSPEC and adaptive optics. We imaged the satellite in broadband Kp (2.2 micron) and H (1.65 micron), and in narrow bands centered at 1.58 and 1.70 micron, with a spatial resolution close to 0.05" (185 km on Io). These images revealed the eruption of a volcano close to Loki, possibly near Carancho like the eruption in 1998 (Macintosh et al. 2003). This doubled Io's flux as compared to the relatively quiescent state in Dec. 2001 (de Pater et al. 2004). In the 1.70 micron image a source shows up near Io's south pole, which is not seen in any of the other 3 images.
We took spectra of Io in the 1.6-1.8 micron range, to map out the SO emission band at 1.708 micron, detected during a conventional "Io-in-eclipse" observation in September 1999 (de Pater et al 2002). While taking spectra, Io drifted through the spectral slit. We typically recorded 4 spectra during a drift episode, which enabled us to get some crude spatial resolution. Unfortunately, the SO emission was quite weak during this time, with a total photon flux 3-4 times lower than in 1999. This forced us to average spectra over large portions of Io's disk. From these spectra it is clear that Loki produces the bulk of the emission, even though it was not very active at the time, as deduced from its K-band flux. Not much SO emission is produced by the bright eruption, nor from Io's northern hemisphere. SO was detected from the southern hemisphere, and most likely is produced by the volcanic source that was detected near the south pole in the narrow 1.7 micron band filter.
Supported by NSF grant AST-0406275 and CfAO.

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