Subaru/COMICS mid-infrared spectroscopic observations of the dust plume from comet 9P/Tempel

T. Ootsubo, S. Sugita, Jun Watanabe, M. Honda, H. Kawakita, T. Kadono, R. Furusho

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

Abstract

We carried out mid-infrared observations of the Deep Impact (DI) collision with a Jupiter-family (JF) comet, 9P/Tempel, using the Cooled Mid-Infrared Camera and Spectrometer (COMICS) on the 8.2 m Subaru Telescope. The N-band spectrum (8-13 μm; R ∼ 250) of the dust ejecta from the comet nucleus 3.5 hours after the DI event shows a strong crystalline silicate feature. The Subaru/COMICS observation also reveals that small (< 1 μm) amorphous pyroxene and carbon-rich grains flew away in the forefront of the ejecta plume before our spectroscopic observation, leaving behind relatively large submicron (0.8-1 μm) crystalline particles that we subsequently observed. The submicron grains within the subsurface layer of comet 9P/Tempel's nucleus have a higher crystalline-to-amorphous silicate ratio than that in the comae of other JF comets, and even that of Oort cloud comets. Near the comet nucleus 3.5 hours after the impact the crystalline-to-amorphous ratio is similar to that of Hale-Bopp coma dust at 0.97 AU.

Original languageEnglish
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
Pages131-136
Number of pages6
DOIs
Publication statusPublished - 2009 Jan 1

Publication series

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

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Physics and Astronomy (miscellaneous)

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    Ootsubo, T., Sugita, S., Watanabe, J., Honda, M., Kawakita, H., Kadono, T., & Furusho, R. (2009). Subaru/COMICS mid-infrared spectroscopic observations of the dust plume from comet 9P/Tempel. In H. U. Kaufl, & C. Sterken (Eds.), Deep Impact as a World Observatory Event: Synergies in Space, Time, and Wavelength: Proceedings of the ESO/VUB Conference (pp. 131-136). (ESO Astrophysics Symposia; Vol. 2009). https://doi.org/10.1007/978-3-540-76959-0_16