Spitzer IRS Observations of Titan as a Precursor to JWST MIRI Observations

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, $5.13 - 14.29 μ m, R \sim 60 - 127$ ) and short wavelength-high resolution channels (SH, $9.89 - 19.51 μ m, R \sim 600$ ) showing the emissions of CH $_{4}$ , C $_{2}$ H $_{2}$ , C $_{2}$ H $_{4}$ , C $_{2}$ H $_{6}$ , C $_{3}$ H $_{4}$ , C $_{3}$ H $_{6}$ , C $_{3}$ H $_{8}$ , C $_{4}$ H $_{2}$ , HCN, HC $_{3}$ N, and CO $_{2}$ . We compare the results obtained for Titan from Spitzer to those of the Cassini Composite Infrared Spectrometer (CIRS) for the same time period, focusing on the $16.35 - 19.35 μ m$ 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 $16.67 - 17.54 μ m$ range that are missing in previous studies. We conclude by identifying spectral features in the $16.35 - 19.35 μ m$ wavelength range, including two prominent emission features at 16.39 and $17.35 μ m$ , that could be analyzed further through upcoming James Webb Space Telescope Cycle 1 observations with the Mid-Infrared Instrument ( $5.0 - 28.3 μ m, R \sim 1500 - 3500$ ). We also highlight gaps in current spectroscopic knowledge of molecular bands, including candidate trace species such as C $_{60}$ and detected trace species such as C $_{3}$ H $_{6}$ , that could be addressed by theoretical and laboratory study.

Spitzer IRS Observations of Titan as a Precursor to JWST MIRI Observations

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Spitzer IRS Observations of Titan as a Precursor to JWST MIRI Observations

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Spitzer IRS Observations of Titan as a Precursor to JWST MIRI Observations

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Spitzer IRS Observations of Titan as a Precursor to JWST MIRI Observations

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