| الوصف: |
In this work we present, for the first time, infrared spectra of Titan from the Spitzer Space Telescope (2004 − 2009). The data are from both the short wavelength-low resolution (SL, 5.13 − 14.29 μm, R ∼ 60 − 127) and short wavelength-high resolution channels (SH, 9.89 − 19.51 μm, R ∼ 600) showing the emissions of CH4, C2H2, C2H4, C2H6, C3H4, C3H6, C3H8, C4H2, HCN, HC3N, and CO2. We compare the results obtained for Titan from Spitzer to those of the Cassini Composite Infrared Spectrometer (CIRS) for the sametime period, focusing on the 16.35 − 19.35 μm wavelength range observed by the SH channel but impacted by higher noise levels in CIRS observations. We use the SH data to provide estimated haze extinction cross-sections for the 16.67 − 17.54 μm range that are missing in previous studies. We conclude by identifying spectral features in the 16.35 − 19.35 μm wavelength range, including two prominent emission features at 16.39 and 17.35 μm, that could be analyzed further through upcoming James Webb Space Telescope Cycle 1 observations with the Mid-Infrared Instrument (5.0−28.3 μm, R ∼ 1500−3500). We also highlight gaps in current spectroscopic knowledge of molecular bands, including candidate trace species such as C60 and detected trace species such as C3H6, that could be addressed by theoretical and laboratory study. |
