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Title:
Observations of Uranus and Neptune with Spitzer
Authors:
Burgdorf, M.; Orton, G.; Meadows, V.; van Cleve, J.
Publication:
36th COSPAR Scientific Assembly. Held 16 - 23 July 2006, in Beijing, China. Meeting abstract from the CDROM, #3168
Publication Date:
00/2006
Origin:
ADS
Bibliographic Code:
2006cosp...36.3168B

Abstract

We present disk-averaged mid-infrared spectra of Uranus and Neptune that were measured with the InfraRed Spectrometer on board Spitzer and far-infrared observations of Neptune only with the Multiband Imaging Photometer for Spitzer MIPS between 103 and 1950 cm The MIPS observations were taken at wavenumbers below 200 cm with low spectral resolving power 15 - 25 which allowed the determination of the spectral energy distribution in the continuum The observations of Neptune were made between 2005-11-9 and 2005-11-22 those of Uranus on 2005-7-6 and 2005-7-7 The apparent planetographic latitude of the center of Uranus from the position of Spitzer was -7 degrees These observations indicate the presence of several previously undetected hydrocarbons ethane methylacetylene and diacetylene on Uranus and possibly methylacetylene on Neptune We discuss apparent variations in the strengths of certain emission features when compared to observations with Spitzer in 2004 The shape of the far-infrared spectrum of Neptune agrees with the measurements by the Infrared Space Observatory ten years earlier but we find the overall brightness temperature 1 - 2 K lower in the MIPS data Further work is needed to decide whether this discrepancy is real or caused by systematic differences in flux calibration between ISO and Spitzer
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