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Spitzer Spectral Observations of the Deep Impact Ejecta

Lisse, C. M. and VanCleve, J. and Adams, A. C. and A’Hearn, M. F. and Fernandez, Y. R. and Farnham, T. L. and Armus, L. and Grillmair, C. J. and Ingalls, J. and Belton, M. J. S. and Groussin, O. and McFadden, L. A. and Meech, K. J. and Schultz, P. H. and Clark, B. C. and Feaga, L. M. and Sunshine, J. M. (2006) Spitzer Spectral Observations of the Deep Impact Ejecta. Science, 313 (5787). pp. 635-640. ISSN 0036-8075.

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Spitzer Space Telescope imaging spectrometer observations of comet 9P/Tempel 1 during the Deep Impact encounter returned detailed, highly structured, 5- to 35-micrometer spectra of the ejecta. Emission signatures due to amorphous and crystalline silicates, amorphous carbon, carbonates, phyllosilicates, polycyclic aromatic hydrocarbons, water gas and ice, and sulfides were found. Good agreement is seen between the ejecta spectra and the material emitted from comet C/1995 O1 (Hale-Bopp) and the circumstellar material around the young stellar object HD100546. The atomic abundance of the observed material is consistent with solar and C1 chondritic abundances, and the dust-to-gas ratio was determined to be greater than or equal to 1.3. The presence of the observed mix of materials requires efficient methods of annealing amorphous silicates and mixing of high- and low-temperature phases over large distances in the early protosolar nebula.

Item Type:Article
Related URLs:
URLURL TypeDescription Online Material
Lisse, C. M.0000-0002-9548-1526
Fernandez, Y. R.0000-0003-1156-9721
Armus, L.0000-0003-3498-2973
Grillmair, C. J.0000-0003-4072-169X
Ingalls, J.0000-0003-4714-1364
Meech, K. J.0000-0002-2058-5670
Clark, B. C.0000-0002-5546-8757
Additional Information:© 2006 American Association for the Advancement of Science. Received 6 January 2006; accepted 13 June 2006; Published online 13 July 2006. This paper was based on observations taken with the NASA SST, operated by the Jet Propulsion Laboratory (JPL)/ CalTech, under JPL contracts 1274400 and 1274485. The authors thank S. Bajt, J. Bradley, D. Brownlee, N. Chabot, B. Clark, N. Dello-Russo, G. Flynn, W. Glaccum, C. Grady, E. Gruen, D. Harker, K. Hibbits, W. Jackson, D. Joswiak, L. Keller, D. Lauretta, A. Li, J. Nuth, W. Reach, A. Rivkin, and D. Wellnitz for valuable discussions; G. Flynn and M. Sitko for their invaluable reviews; and J. Jackson and S. Kido for their help with the graphics.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Issue or Number:5787
Record Number:CaltechAUTHORS:20141119-091710206
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51944
Deposited By: Tony Diaz
Deposited On:19 Nov 2014 23:39
Last Modified:31 Oct 2019 01:57

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