Chemical evolution of sulfur-bearing molecules in interstellar molecular clouds
Project/Area Number |
26707030
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Research Category |
Grant-in-Aid for Young Scientists (A)
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Allocation Type | Partial Multi-year Fund |
Research Field |
Geochemistry/Cosmochemistry
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Research Institution | Hokkaido University |
Principal Investigator |
OBA YASUHIRO 北海道大学, 低温科学研究所, 助教 (00507535)
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Project Period (FY) |
2014-04-01 – 2017-03-31
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Project Status |
Completed (Fiscal Year 2016)
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Budget Amount *help |
¥24,570,000 (Direct Cost: ¥18,900,000、Indirect Cost: ¥5,670,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Fiscal Year 2015: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
Fiscal Year 2014: ¥15,730,000 (Direct Cost: ¥12,100,000、Indirect Cost: ¥3,630,000)
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Keywords | 化学進化 / 硫黄 / 重水素濃集 / 星間分子雲 / 表面反応 / トンネル効果 |
Outline of Final Research Achievements |
In the present study, laboratory experiments on the chemical evolution of the representative sulfur-bearing interstellar molecules, hydrogen sulfide (H2S), were performed under the interstellar conditions (low T, P). H2S was found to react with H and D atoms on the substrate at low temperatures. When it reacts with H atoms, the H of H2S is abstracted to form HS radicals, which are expected to react with other H atoms to result in the formation of H2S again. However, the H2S abundance was getting smaller with H atom exposure times. This is probably due to the chemical desorption of H2S by using the heat of formation of H2S. When H2S reacted with D atoms under the similar conditions, the formation of its deuterated counterparts (HDS and D2S) was confirmed. It is strongly expected that the high degree of H2S deuteration levels in interstellar and cometary H2S is induced by surface reactions on interstellar grains.
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Report
(4 results)
Research Products
(37 results)
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[Presentation] Photochemistry in the molecular cloud and protoplanetary disk: Evolution of ice and organic residues through warming and UV-irradiation2016
Author(s)
L. Piani, S. Tachibana, T. Hama, I. Sugawara, Y. Oba, H. Tanaka, Y. Kimura, A. Miyake, J. Matsuno, A. Tsuchiyama, H. Yurimoto, A. Kouchi
Organizer
47th Lunar and Planetary Science Conference
Place of Presentation
The Woodlands, TX, USA
Year and Date
2016-03-21
Related Report
Int'l Joint Research
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[Presentation] Photochemistry in the molecular cloud: Evolution of ice and organic residues through warming and UV-irradiation2016
Author(s)
L. Piani, S. Tachibana, T. Hama, I. Sugawara, Y. Oba, H. Tanaka, Y. Kimura, A. Miyake, J. Matsuno, A. Tsuchiyama, H. Yurimoto, A. Kouchi
Organizer
Solar-System symposium in Sapporo 2016
Place of Presentation
Rusutsu Resort, Hokkaido, (虻田郡 留寿都村)
Year and Date
2016-02-17
Related Report
Int'l Joint Research
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