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| Titel |
Problems and Solutions in the Analysis of Spitzer IRS Observations of Uranus and Neptune: Results for Temperature Structure and Composition |
| VerfasserIn |
G. Orton, L. Fletcher, A. Mainzer, M. Line, C. Merlet, D. Hines, H. Hammel, M. Burgdorf, J. Moses |
| Konferenz |
EGU General Assembly 2009
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 11 (2009) |
| Datensatznummer |
250022059
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| Zusammenfassung |
| Mid-infrared spectra of the disks of Uranus and Neptune were obtained with Spitzer’s very
sensitive Infrared Spectrometer (IRS). The IRS covered the wavelength range of 5 to
21.5 μm with a resolving power of ~90 and of 10 to 36.5 μm with a resolving
power of ~600, although there were problems with the high-resolution modes at
the longest wavelengths. The spectra do not resolve the disks of either planet, but
they are nonetheless replete with information about the global-mean temperature
structure and composition of both planets. This presentation will concentrate on the
approaches used to derive temperatures and compositions. Derivation of an average
temperature profile will be demonstrated principally using spectra of Uranus, using
the collision-induced absorption "continuum" and quadrupole lines of molecular
hydrogen. Derivation of composition will be demonstrated princially using spectra of
Neptune, covering features arising from methyl, methane, acetylene, ethyene, ethane,
diacetylene, methylacetylene, and carbon dioxide. The benefits of recent improvements in
spectroscopic parameters will be demonstrated, and the need for improvements in others
outlined. |
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