| 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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| 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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