Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006dps....38.1705s&link_type=abstract
American Astronomical Society, DPS meeting #38, #17.05; Bulletin of the American Astronomical Society, Vol. 38, p.513
Astronomy and Astrophysics
Astronomy
Scientific paper
We present new results from analysis of data from the 1.05-4.8 micron infrared (IR) spectrometer on-board the Deep Impact Flyby spacecraft. Data spanning the various ejecta components including the shocked vapor plume, early stage ejecta, and bulk ejecta are examined spatially over time. Changes in organic to volatile ratios are observed in the passing vapor plume suggesting variations in composition with depth. After the passage of this high velocity vapor, the solid ejecta is shown to contain water ice. The water is spatially decoupled from the ejected dust, and appears to be concentrated in the central downrange ejecta and uprange rays. Modeling of water ice absorptions and overall IR continuum reveal that the ejecta is formed by micron-size particles, consistent with the presence of water ice in the last data, some 45 minutes after impact. Compared to pre-impact, ambient conditions, the bulk ejecta includes emissions not seen before impact. This research was funded by NASA (NASW00004) in support of Deep Impact Discovery mission.
A'Hearn Michael
Feaga Lori
Groussin Olivier
Klaasen Ken
Schultz Peter
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