| Autor: |
Knacke, R.F., Fajardo-Acosta, S.B., Geballe, T.R., Noll, Keith S. |
| Zdroj: |
Icarus; February 1997, Vol. 125 Issue: 2 p340-347, 8p |
| Abstrakt: |
We report a series of 2.2- to 2.4-μm spectra of the R impact of Comet Shoemaker–Levy 9 obtained with the UKIRT telescope. Spectra were recorded at approximately 1- to 2-min intervals spanning the impact event. During the rapid rise of the splashback flash, we observed apparent continuum emission, probably from dust, as well as band/line emission from CH4and possibly other molecules. At 3 to 4 min into the splashback, the 2–0 bandhead of CO became prominent. CO excitation temperatures were greater than 2000 K near the peak of the splashback emission. As the splashback emission declined, the CO temperature continued to rise, as predicted by some models of the splashback. LTE models of the spectra, incorporating CH4and CO, require on the order of 1011g of hot CO. This is a small fraction of the total observed by radio techniques sensitive to cold CO. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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