CaltechAUTHORS
Published August 4, 2006 | Version Supplemental Material
Journal Article Open

Spitzer Spectral Observations of the Deep Impact Ejecta

Creators

  • 1. ROR icon Johns Hopkins University Applied Physics Laboratory
  • 2. ROR icon University of Maryland, College Park
  • 3. ROR icon University of Central Florida
  • 4. ROR icon California Institute of Technology
  • 5. ROR icon University of Hawaii at Manoa
  • 6. ROR icon Brown University
  • 7. ROR icon Lockheed Martin (United States)

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.

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Additional details

Identifiers

Eprint ID
51944
Resolver ID
CaltechAUTHORS:20141119-091710206

Funding

JPL
1274400
JPL
1274485

Dates

Created
2014-11-19
Created from EPrint's datestamp field
Updated
2023-03-16
Created from EPrint's last_modified field

Caltech Custom Metadata

Caltech groups
Infrared Processing and Analysis Center (IPAC)