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Imaging polarimetry of Comet 9P/Tempel before and after the Deep Impact |
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| Authors: | Reiko Furusho Yuji Ikeda Wing-Huen Ip Toshihiro Kasuga Yusuke Sato Ming-Shin Chang Jun-ichi Watanabe |
| Institution: | a Faculty of Education and Integrated Sciences, Waseda University, 1-6-1 Nishi-waseda, Shinjuku, Tokyo 169-8050, Japan b Photocoding, 3-16-8-101 Hashimoto, Sagamihara, Kanagawa 229-1103, Japan c Institute of Astronomy, National Central University, Jhong Li 320, Taiwan d Department of Physics, Faculty of Science, Kyoto Sangyo University, Motoyama, Kamigamo, Kita-ku, Kyoto 603-8555, Japan e National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan f Communicators in Science and Technology Education Program, Hokkaido University, N10W8, Kita-ku, Sapporo, Hokkaido 060-0810, Japan |
| Abstract: | The NASA's Deep Impact mission was the first impact experiment to a cometary nucleus. The target of the mission was Comet 9P/Tempel, one of the Jupiter family comets. The impact was performed on July 4th, 2005. Imaging polarimetric observations were carried out by Polarimetric Imager for COmets (PICO) mounted on the Lulin One-meter Telescope (LOT) at Lulin Observatory, Taiwan. Intensity and linear polarization degree maps were obtained on July 3-5, 2005. Impact ejecta plume was clearly recognized in the enhanced intensity map. Furthermore, arc-shaped region of high polarization was recognized in the polarization map. Dust grains in this region had larger expansion velocity than the grains which provided the brightest area in the intensity map. comparing our results with the MIR spectroscopy obtained by Subaru Telescope we conclude that very small carbonaceous grains might be responsible for the region of high polarization. |
| Keywords: | Comet Tempel-1 Comets dust The Deep Impact Polarimetry |
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