Liquid-like behavior of UV-irradiated interstellar amorphous ice and its physical properties
| Project/Area Number |
16H04072
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Petrology/Mineralogy/Economic geology
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| Research Institution | Hokkaido University |
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Principal Investigator |
Kouchi Akira 北海道大学, 低温科学研究所, 教授 (60161866)
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| Project Period (FY) |
2016-04-01 – 2020-03-31
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| Project Status |
Completed (Fiscal Year 2019)
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| Budget Amount *help |
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2019: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2018: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2017: ¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2016: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
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| Keywords | アモルファス氷 / 紫外線照射 / 液化 / 粘性 / 誘電緩和 / 過冷却液体 / 誘電緩和時間 |
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| Outline of Final Research Achievements |
Amorphous ices including impurity molecules is the most abundant solid component of interstellar molecular clouds and the outer cold part of protoplanetary disks. Ultraviolet (UV) photon irradiation of amorphous H2O-dominated may play a key role in synthesizing complex organic matter, amino acids, sugars, and nucleobases. However, there has been no study on the physical properties of UV-irradiated ices. Therefore, we investigated the heating process of UV-irradiated ices using optical and electron microscopy. We found that UV-irradiated amorphous ices composed of H2O, CH3OH, and NH3 and of pure H2O show liquid-like behavior over the temperature ranges of 65 to 150 K and 50 to 140 K, respectively. This low-viscosity liquid-like ice may enhance the formation of organic compounds including prebiotic molecules and the accretion of icy grains to form icy planetesimals.
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| Academic Significance and Societal Importance of the Research Achievements |
これまで，アモルファス氷は固体であり，紫外線照射によって変化することはないと考えられてきた．しかし，本研究の発見によりこの常識は覆された．また，この結果は，液化した氷（水）中では光化学反応が格段に速く進むこと，これらの微粒子同士の付着成長が促進される可能性があることを示している．これまでの惑星科学の常識を見直す必要があることを示している．
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Report
(5 results)
Research Products
(56 results)
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[Journal Article] Development of Multi-temperature Calibrator for the TES Bolometer Camera: Deployment at ASTE2018
Author(s)
T. Oshima, K. Ohtawara, T. Takekoshi1, S. Ishii, N. Izumi, T. Izumi, M. Yamaguchi, S. Suzuki, K. Muraoka, A. Hirota, F. Saito, S. Nakatsubo, A. Kouchi, T. Ito, K. Uemizu, Y. Fujii, Y. Tamura, K. Kohno, R. Kawabe
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Journal Title
Journal of Low Temperature Physics
Volume: 193
Issue: 5-6
Pages: 996-1002
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Development of Multi-temperature Calibrator for the TES Bolometer Camera: System Design2018
Author(s)
T. Takekoshi, K. Ohtawara, T. Oshima, S. Ishii, N. Izumi, T. Izumi, M. Yamaguchi, S. Suzuki, K. Muraoka, A. Hirota, F. Saito, S. Nakatsubo, A. Kouchi, T. Ito, K. Uemizu, Y. Fujii, Y. Tamura, K. Kohno, R. Kawabe
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Journal Title
Journal of Low Temperature Physics
Volume: 193
Issue: 5-6
Pages: 1003-1009
DOI
Related Report
Peer Reviewed / Open Access
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[Journal Article] Simulations and Spectra of Water in CO Matrices2017
Author(s)
R. Escribano, E. Artacho, A. Kouchi, T. Hama, Y. Kimura, H. Hidaka, and N Watanabe
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Journal Title
Physical Chemistry Chemical Physics
Volume: 19
Issue: 10
Pages: 7280-7287
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Journal Article] Evolution of morphological and physical properties of laboratory interstellar organic residues with ultraviolet irradiation2017
Author(s)
Piani L., Tachibana S., Hama T., Tanaka H., Endo Y., Sugawara I., Dessimoulie L., Kimura Y., Miyake A., Matsuno J., Tsuchiyama A., Fujita K., Nakatsubo S., Fukushi H., Mori S., Chigai T., Yurimoto H. and Kouchi A.
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Journal Title
The Astrophysical Journal
Volume: 837
Issue: 1
Pages: 35-35
DOI
Related Report
Peer Reviewed / Open Access / Int'l Joint Research / Acknowledgement Compliant
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[Presentation] Surface diffusion of OH radical on amorphous solid water2019
Author(s)
Miyazaki, A. , Watanabe, N., Sameera, W.M.C, Hama, T. , Hidaka, H. , Kouchi, A.
Organizer
IAUS 350: Laboratory Astrophysics: from Observations to Interpretation
Related Report
Int'l Joint Research
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[Presentation] Liquid-like behavior of water ice induced by vacuum ultraviolet irradiation at low temperatures2019
Author(s)
HAMA, Tetsuya; TACHIBANA, Shogo; KOUCHI, Akira; OBA, Yasuhiro; PIANI, Laurette; HIDAKA, Hiroshi; KIMURA, Yuki; MURATA, Ken-ichiro; YURIMOTO, Hisayoshi; WATANABE, Naoki
Organizer
35th Symposium on Chemical Kinetics and Dynamics
Related Report
Int'l Joint Research
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[Presentation] Observation of liquid-like behavior of UV-irradiated amorphous ices2017
Author(s)
A. Kouchi, S. Tachibana, T. Hama, Y. Oba, L. Piani, I. Sugawara, Y. Endo, H. Hidaka, Y. Kimura, K. Murata, H. Yurimoto, and N. Watanabe
Organizer
Meeting on DIPPS (Dust and Ice Particles Spectroscopy and Scattering)
Related Report
Int'l Joint Research / Invited
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