Imaging polarimetry of Comet 9P/Tempel before and after the Deep Impact

Reiko Furusho; Yuji Ikeda; Daisuke Kinoshita; Wing Huen Ip; Hideyo Kawakita; Toshihiro Kasuga; Yusuke Sato; Hung Chin Lin; Ming Shin Chang; Zhong Yi Lin; Jun ichi Watanabe

doi:10.1016/j.icarus.2007.03.036

Imaging polarimetry of Comet 9P/Tempel before and after the Deep Impact

Reiko Furusho, Yuji Ikeda, Daisuke Kinoshita, Wing Huen Ip, Hideyo Kawakita, Toshihiro Kasuga, Yusuke Sato, Hung Chin Lin, Ming Shin Chang, Zhong Yi Lin, Jun ichi Watanabe

Graduate Institute of Astronomy

Research output: Contribution to journal › Article › peer-review

22 Scopus citations

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.

Original language	English
Pages (from-to)	454-458
Number of pages	5
Journal	Icarus
Volume	190
Issue number	2
DOIs	https://doi.org/10.1016/j.icarus.2007.03.036
State	Published - Oct 2007

Keywords

Comet Tempel-1
Comets
Polarimetry
The Deep Impact
dust

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@article{17761200b6944f1f9a74d82ef608edbc,

title = "Imaging polarimetry of Comet 9P/Tempel before and after the Deep Impact",

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, Polarimetry, The Deep Impact, dust",

author = "Reiko Furusho and Yuji Ikeda and Daisuke Kinoshita and Ip, {Wing Huen} and Hideyo Kawakita and Toshihiro Kasuga and Yusuke Sato and Lin, {Hung Chin} and Chang, {Ming Shin} and Lin, {Zhong Yi} and Watanabe, {Jun ichi}",

note = "Funding Information: We appreciate the local staffs of Lulin Observatory for their great support of our observations. We thank Dr. Ludmilla Kolokolova for her precise and valuable suggestions and comments. This research was partially financial supported by the Ministry of Education, Science, and Culture of Japan under grants, 17740112 (R.F.) and 17740119 (H.K.). Data analysis was in part carried out on the general common-use computer system at the Astronomical Data Analysis Center (ADAC) of the National Astronomical Observatory of Japan. The work at Lulin was supported by Grant NSC 94-2112-M-008-033.",

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T1 - Imaging polarimetry of Comet 9P/Tempel before and after the Deep Impact

AU - Furusho, Reiko

AU - Ikeda, Yuji

AU - Kinoshita, Daisuke

AU - Ip, Wing Huen

AU - Kawakita, Hideyo

AU - Kasuga, Toshihiro

AU - Sato, Yusuke

AU - Lin, Hung Chin

AU - Chang, Ming Shin

AU - Lin, Zhong Yi

AU - Watanabe, Jun ichi

N1 - Funding Information: We appreciate the local staffs of Lulin Observatory for their great support of our observations. We thank Dr. Ludmilla Kolokolova for her precise and valuable suggestions and comments. This research was partially financial supported by the Ministry of Education, Science, and Culture of Japan under grants, 17740112 (R.F.) and 17740119 (H.K.). Data analysis was in part carried out on the general common-use computer system at the Astronomical Data Analysis Center (ADAC) of the National Astronomical Observatory of Japan. The work at Lulin was supported by Grant NSC 94-2112-M-008-033.

PY - 2007/10

Y1 - 2007/10

N2 - 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.

AB - 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.

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KW - Comets

KW - Polarimetry

KW - The Deep Impact

KW - dust

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DO - 10.1016/j.icarus.2007.03.036

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SP - 454

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JO - Icarus

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ER -

Imaging polarimetry of Comet 9P/Tempel before and after the Deep Impact

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Keywords

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