Spitzer spectral observations of the Deep Impact ejecta

    Authors

    C. M. Lisse; J. VanCleve; A. C. Adams; M. F. A'Hearn; Y. R. Fernandez; T. L. Farnham; L. Armus; C. J. Grillmair; J. Ingalls; M. J. S. Belton; O. Groussin; L. A. McFadden; K. J. Meech; P. H. Schultz; B. C. Clark; L. M. Feaga;J. M. Sunshine

    Comments

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    Abbreviated Journal Title

    Science

    Keywords

    COMET HALE-BOPP; INTERPLANETARY DUST PARTICLES; SPACE-TELESCOPE; HALLEY; DUST; CRYSTALLINE SILICATES; EMISSION FEATURES; SULFIDE GRAINS; WATER; ICE; 9P/TEMPEL-1; NUCLEUS; Multidisciplinary Sciences

    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, phyllositicates, 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.

    Journal Title

    Science

    Volume

    313

    Issue/Number

    5787

    Publication Date

    1-1-2006

    Document Type

    Article

    Language

    English

    First Page

    635

    Last Page

    640

    WOS Identifier

    WOS:000239667500034

    ISSN

    0036-8075

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