Spitzer Spectral Observations of the Deep Impact Ejecta
Abstract
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.
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.Attached Files
Supplemental Material - Lisse.SOM.pdf
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Additional details
- Eprint ID
- 51944
- Resolver ID
- CaltechAUTHORS:20141119-091710206
- JPL
- 1274400
- JPL
- 1274485
- Created
-
2014-11-19Created from EPrint's datestamp field
- Updated
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2023-03-16Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)