Title

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 01 (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.

Publication Date

8-4-2006

Publication Title

Science

Volume

313

Issue

5787

Number of Pages

635-640

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1126/science.1124694

Socpus ID

33746883886 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/33746883886

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