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The Infrared Spectrograph (IRS) on board the Spitzer Space Telescope observedabout 15,000 objects during the cryogenic mission lifetime. Observationsprovided low-resolution (R~60-127) spectra over ~5-38um and high-resolution(R~600) spectra over ~10-37um. The Cornell Atlas of Spitzer/IRS Sources(CASSIS) was created to provide publishable quality spectra to the community.Low-resolution spectra have been available in CASSIS since 2011, and we presenthere the addition of the high-resolution spectra. The high-resolutionobservations represent approximately one third of all staring observationsperformed with the IRS instrument. While low-resolution observations areadapted to faint objects and/or broad spectral features (e.g., dust continuum,molecular bands), high-resolution observations allow more accurate measurementsof narrow features (e.g., ionic emission lines) as well as a better sampling ofthe spectral profile of various features. Given the narrow aperture of the twohigh-resolution modules, cosmic ray hits and spurious features usually plaguethe spectra. Our pipeline is designed to minimize these effects through variousimprovements. A super sampled point-spread function was created in order toenable the optimal extraction in addition to the full aperture extraction. Thepipeline selects the best extraction method based on the spatial extent of theobject. For unresolved sources, the optimal extraction provides a significantimprovement in signal-to-noise ratio over a full aperture extraction. We havedeveloped several techniques for optimal extraction, including a differentialmethod that eliminates low-level rogue pixels (even when no dedicatedbackground observation was performed). The updated CASSIS repository nowincludes all the spectra ever taken by the IRS, with the exception of mappingobservations.

CASSIS: The Cornell Atlas of Spitzer/Infrared Spectrograph Sources. II. High-resolution observations