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Current versions: low-resolution=LR7 / high-resolution=HR1

Important announcements (Full news & updates here)
- 2017 Jul 14: Partially-extended source flux calibration is now provided for tapered column extractions
- 2016 Nov 23: CASSIS now stands for "Combined Atlas of Sources with Spitzer IRS spectra. New URL to CASSIS: cassis.sirtf.com
- 2015 Jun 25: First release for high-resolution (HR1)! See accompanying published paper
- 2015 Jun 25: LR7 released. See Technical Note.
- 2014 Feb 26: LR6 released. See Technical Note.
- 2013 Mar 26: LR5 released. See Technical Note.
- 2011 Aug 15: CASSIS released ("LR4"). See accompanying published paper




CASSIS provides both low- and high-resolution spectra, coming from two different pipelines and described in two different publications. We kindly ask users to use the following reference(s) for citations.


Low-resolution atlas

The chief publication describing the preparation and methodology of the CASSIS low-resolution atlas is CASSIS: The Cornell Atlas of Spitzer/IRS Sources, published in the Astrophysical Journal Supplement.

The above publication presents the low-resolution pipeline in its first public version "LR4". New versions were released since, please read this document for details.
Check also the caveats page for more information


High-resolution atlas

The publication describing the high-resolution pipeline is CASSIS: The Cornell Atlas of Spitzer/Infrared Spectrograph Sources. II. High-resolution Observations, published in the Astrophysical Journal Supplement.

The above publication presents the high-resolution pipeline in its first publica version "HR1".







How to acknowledge CASSIS and the seminal Spitzer/IRS papers:

The CASSIS atlas is presented in two publications. We ask users to refer to the relevant paper (or the two papers if appropriate) in their studies:

  • Reference for the low-resolution atlas: (click here for detailed bibliography links)
    "CASSIS: The Cornell Atlas of Spitzer/IRS Sources", Lebouteiller, V., Barry, D.J., Spoon, H.W.W., Bernard-Salas, J., Sloan, G.C., Houck, J.R., & Weedman, D., 2011, ApJS, 196, 8
  • Reference for the high-resolution atlas: (click here for detailed bibliography links)
    "CASSIS: The Cornell Atlas of Spitzer/IRS Sources. II. High-resolution Observations", Lebouteiller, V., Barry, D.J., Goes, C., Sloan, G.C., Spoon, H.W.W., Weedman, D.W., Bernard-Salas, J., Houck, J.R., 2015, ApJS, 218, 21
  • A footnote may also be used where appropriate:
    The Combined Atlas of Sources with Spitzer IRS Spectra (CASSIS) is a product of the IRS instrument team, supported by NASA and JPL.
  • Specify the AORkey(s) and the date of retrieval (or version number) in your publications.

  • Additional references:
      - The primary paper for Spitzer: Werner et al. 2004.
      - The primary paper for the IRS instrument: Houck et al. 2004.
      - For studies using the SMART software: Lebouteiller et al. 2010 and Higdon et al. 2004.


    Tools & Links : IRS pocket guide IRS handbook IRSA server SMART page IRS data analysis tools Publications using CASSIS Acronyms