|
|||||
|
|
Temporal behavior of the SO 1.707 μm ro-vibronic emission band in Io's atmosphere |
|
| Authors: | Conor Laver Imke de Pater Darrell F. Strobel |
| Affiliation: | a Department of Astronomy, 601 Campbell Hall, University of California, Berkeley, CA 94720, USA b Division of Geological and Planetary Sciences, California Institute of Technology, Pasadena, CA 91125, USA c Department of Earth and Planetary Sciences and Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA |
| Abstract: | We report observations of the ro-vibronic a1Δ→X3Σ− transition of SO at 1.707 μm 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 0.8×1027 to 2.4×1027 photons/s, with a possible link to variations in Loki's infrared brightness. The band-shapes imply rotational temperatures of 550-1000 K for the emitting gas, lending further evidence to a volcanic origin for sulfur monoxide. An attempt to detect the B1Σ→X3Σ− transition of SO at 0.97 μm was unsuccessful; simultaneous detection with the 1.707 μm band would permit determination of the SO column abundance. |
| Keywords: | Io Atmospheres, composition Jupiter, satellites Volcanism |
| 本文献已被 ScienceDirect 等数据库收录！ | |