Disk-resolved Submillimeter Observations Of SO, SO2 And NaCl In The Atmosphere Of Io

Details Disk-resolved Submillimeter Observations Of SO, SO2 And NaCl In The Atmosphere Of Io Disk-resolved Submillimeter Observations Of SO, SO2 And NaCl In The Atmosphere Of Io

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007dps....39.0304g&link_type=abstract

American Astronomical Society, DPS meeting #39, #3.04; Bulletin of the American Astronomical Society, Vol. 39, p.411

Astronomy and Astrophysics

Astronomy

Scientific paper

We will present the first disk-resolved submillimeter observations of the atmosphere of Io using the Submillimeter Array. Observations were obtained on 2006 June 2 (leading hemisphere) and June 10 (trailing hemisphere), and we report simultaneous detection of two submillimeter transitions of SO2 (at 346.524 and 346.652 GHz) and single transitions of SO and NaCl (at 346.528 and 338.022 GHz, respectively). The synthesized resolution was roughly 0.75" FWHM while Io was near 1.1" in diameter, coarsely resolving the moon and its atmosphere. The leading hemisphere data have not been fully reduced due to correlator problems we are working to overcome. The trailing hemisphere observations show that the peak emission from both sulfur species is offset westward from the disk center, suggesting localized emission favoring the anti-Jupiter side of Io, rather than a uniform thin atmosphere. NaCl shows a possible north-south difference in emission brightness. In our presentation we will compare differences between the leading and trailing hemispheres, as well as compare with millimeter results of SO2 obtained in Jan. and Feb. 2005 using the IRAM interferometer (Moullet et al 2006, BAAS, 38, pg. 612).

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