Gemini-N observations of the dust excavated from comet 9P/Tempel 1 during deep impact

D. E. Harker, Chick E Woodward, D. H. Wooden

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present mid-infrared spectra of the GEMINI-N (+MICHELLE) observations of comet 9P/Tempel 1 during its encounter with Deep Impact (≈7 min cadence). Based on our modeling of the spectra, we find that the submicron sized dust grains travel away from the nucleus faster than the larger grains. Groups of grains of differing mineral composition travel at different ejection velocities. Amorphous olivine and amorphous carbon grains travel together at one speed, while amorphous pyroxene and crystalline olivine travel together at another speed. The different speed of the two mineral groups implies that Deep Impact excavated a layer of material below an amorphous carbon and amorphous olivine rich surface layer to release an amorphous pyroxene and crystalline olivine rich layer.

Original languageEnglish (US)
Title of host publicationDeep Impact as a World Observatory Event
Subtitle of host publicationSynergies in Space, Time, and Wavelength: Proceedings of the ESO/VUB Conference
EditorsHans Ulrich Kaufl, Christiaan Sterken
Pages115-120
Number of pages6
DOIs
StatePublished - Jan 1 2009

Publication series

NameESO Astrophysics Symposia
Volume2009
ISSN (Print)1431-2433
ISSN (Electronic)1611-6143

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