2004 Fiscal Year Final Research Report Summary
GLOBAL DUST CIRCULATION IN THE PROTO-PLANETARY DISK
| Project/Area Number |
13304046
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
地球化学
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| Research Institution | TOKYO INSTITUTE OF TECHNOLOGY |
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Principal Investigator |
YURIMOTO Hisayoshi TOKYO INSTITUTE OF TECHNOLOGY, GRADUATE SCHOOL OF SCIENCE AND ENGINEERING, ASSOCIATE PROFESSOR, 大学院・理工学研究科, 助教授 (80191485)
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| Co-Investigator(Kenkyū-buntansha) |
IDA Shigeru TOKYO INSTITUTE OF TECHNOLOGY, GRADUATE SCHOOL OF SCIENCE AND ENGINEERING, ASSOCIATE PROFESSOR, 大学院・理工学研究科, 助教授 (60211736)
FUJIMOTO Masaki TOKYO INSTITUTE OF TECHNOLOGY, GRADUATE SCHOOL OF SCIENCE AND ENGINEERING, ASSOCIATE PROFESSOR, 大学院・理工学研究科, 助教授 (30242811)
KURAMOTO Kiyoshi TOKYO INSTITUTE OF TECHNOLOGY, GRADUATE SCHOOL OF SCIENCE, ASSOCIATE PROFESSOR, 大学院・理学研究科, 助教授 (50311519)
EMORI Hiroyuki TOKYO INSTITUTE OF TECHNOLOGY, GRADUATE SCHOOL OF SCIENCE AND ENGINEERING, RESEARCH ASSOCIATE, 大学院・理工学研究科, 助手 (30262257)
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| Project Period (FY) |
2001 – 2004
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| Keywords | Planetary system / Proto-planetary disk / Meteorite / Electro-magneto-fluid / Disk dynamics / Numerical simulation / Mass spectrometry / Proto-star |
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| Research Abstract |
It is believed that bulk chemical compositions among planets and asteroids in the solar system is similar but slightly different from the solar abundance ratios one another. The variations of the bulk composition may result from a global circulation of dusts around the proto-planetary disk. The dusts spiral into the proto-sun from outer edge of the disk and some of them launched from the inner edge of the disk to the outer-edge. In this study, we made chemical analyses of meteorites and numerical simulations of electro-magnetic effects, dynamic effects and chemical reaction network estimated in the proto-planetary disk. We may conclude the subjects as follows :
1.Oxygen isotopic anomaly observed in the solar system was originated in the parent molecular cloud by a self-shielding effect of carbon monoxides by ultra-violet light irradiation.
2.The oxygen isotopic fractionation in the molecular cloud was separated into interstellar gas and ice phases. Differences of dynamics and chemistry in the disk introduced the anomaly of oxygen isotopes in the solar system.
3.oxygen isotopic compositions of planets were mainly determined by enrichment factor of dusts and evaporation of ice in a proto-planetary disk.
4.A numerical simulation suggests that trajectory around a central star and the mass of gas planets were controlled by gas-dust ratios in a proto-planetary disk. The results correspond to probabilities of extra-solar planets by astronomical observations. This conclusion suggests that amounts of proto-planetary disk are determined by star-formation process, but the planetary formation around the star is controlled by the gas-dust ratio in the disk.
5.Nature of electro-magneto vortex of interstellar plasma was simulated numerically. Inertia effects of electrons are important to the vortex evolution. Larger scale vortex is immediately fractionized to smaller scale ones. This process suggests that material mixing is promptly evolved in the space than ever thought.
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