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S. Sugita,1,4,5*T. Ootsubo,6T. Kadono,1,7M. Honda,4S. Sako,2T. Miyata,2I. Sakon,3T. Yamashita,8H. Kawakita,9H. Fujiwara,3T. Fujiyoshi,8N. Takato,8T. Fuse,8J. Watanabe,10R. Furusho,11S. Hasegawa,4T. Kasuga,10T. Sekiguchi,10D. Kinoshita,12K. J. Meech,13D. H. Wooden,14W. H. Ip,12M. F. A'Hearn15
The impact cratering process on a comet is controversial butholds the key for interpreting observations of the Deep Impactcollision with comet 9P/Tempel 1. Mid-infrared data from theCooled Mid-Infrared Camera and Spectrometer (COMICS) of theSubaru Telescope indicate that the large-scale dust plume ejectedby the impact contained a large mass (106 kilograms) of dustand formed two wings approximately ±45° from thesymmetric center, both consistent with gravity as the primarycontrol on the impact and its immediate aftermath. The dustdistribution in the inner part of the plume, however, is inconsistentwith a pure gravity control and implies that evaporation andexpansion of volatiles accelerated dust.
1 Department of Complexity Science and Engineering, University of Tokyo, Kashiwa, Chiba, Japan. 2 Institute of Astronomy, University of Tokyo, Miaka, Tokyo, Japan. 3 Department of Astronomy, University of Tokyo, Hongo, Tokyo, Japan. 4 Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Sagamihara, Kanagawa, Japan. 5 Department of Geological Sciences, Brown University, Providence, RI, USA. 6 Division of Particle and Astrophysical Sciences, Nagoya University, Nagoya, Aichi, Japan. 7 Institute for Research on Earth Evolution, Japan Agency for Marine-Earth Science and Technology, Yokosuka, Kanagawa, Japan. 8 Subaru Telescope, National Astronomical Observatory of Japan, National Institutes of Natural Sciences, Hilo, HI, USA. 9 Department of Physics, Kyoto Sangyo University, Kamigamo, Kyodo, Japan. 10 National Astronomical Observatory of Japan, Mitaka, Tokyo, Japan. 11 Waseda University, Nishiwaseda, Tokyo, Japan. 12 Institute of Astronomy, National Central University, Chung-Li, Taiwan. 13 Institute for Astronomy, University of Hawaii, Honolulu, HI, USA. 14 Space Science Division, NASA Ames Research Center, Moffett Field, CA, USA. 15 Department of Astronomy, University of Maryland, College Park, MD, USA.
* To whom correspondence should be addressed. E-mail: sugita{at}k.u-tokyo.ac.jp
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106 kilograms) of dust and formed two wings approximately ±45° from the symmetric center, both consistent with gravity as the primary control on the impact and its immediate aftermath. The dust distribution in the inner part of the plume, however, is inconsistent with a pure gravity control and implies that evaporation and expansion of volatiles accelerated dust. 
