A Spectral Survey of Six Comets in the Mid-Infrared.

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With the Spitzer Space Telescope (SST) and Infrared Space Observatory (ISO) we are beginning to understand the details of how the composition and formation of our own Solar System compares to those of other stars in our Galaxy. Recent, detailed observations of comets (remnants of the solar system's proto-stellar nebula), protoplanetary disks around young stellar objects (YSOs), and debris disks around moderate-age stars have given us a collection of detailed spectra containing clues about our Galactic context. Here we discuss 5 to 35 micron spectroscopy of the emission from dust grains and gas molecules in the comae of 6 recent comets: C/Hale-Bopp 1995 O1 [1], 29P/SW1 2004 [2], 9P/Tempel 1 2005 (ejecta) [3], 73P/SW3 (fragments B and C) [4], C/McNaught 2006 P1 [5], and 17P/Holmes 2007 [6].
We thank the Spitzer Science Center, the ISO project, and the NASA/IRTF for their support of this work. References: [1] Crovisier, J. et al. 1997, Science 275, 1904. [2] Stansberry, J.A. et al. 2004, ApJ Suppl. 154, 463. [3] Lisse, C.M. et al. 2006, Science 313, 635. [4] Sitko, M.L., et al. 2008, ACM 2008 abstract #8101. [5] Lisse, C.M. et al. 2007, IAUC 8862. [6] Reach, W.T. et al. 2009, in prep.

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