2017 Fiscal Year Annual Research Report
The regulation of angular momentum in star formation: the secret behind planet formation
| Project/Area Number |
17F17802
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| Research Institution | Osaka University |
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Principal Investigator |
長峯 健太郎 大阪大学, 理学研究科, 教授 (50714086)
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| Co-Investigator(Kenkyū-buntansha) |
MARCHAND PIERRE 大阪大学, 理学(系)研究科(研究院), 外国人特別研究員
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| Project Period (FY) |
2017-11-10 – 2020-03-31
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| Keywords | 理論天文学 / 星形成 / 数値シミュレーション / 磁気流体力学 |
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| Outline of Annual Research Achievements |
Pierre has finished and submitted a 16 pages paper on the role of the Hall effect during star formation. We implemented the non-ideal MHD effects on our AMR MHD code RAMSES, and performed many tests and simulations. The first report from the referee is very positive and promising.
Pierre has made some progress on his work on binary star formation. The simulations are almost done and their analysis has started.
He has also started a new project with Nagamine's group on the direct collapse scenario of formation of supermassive black holes seeds. He is adapting his simulation code to this problem, and now the simulations are almost ready to run.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The paper concerning the Hall effect took more time than expected due to the length of the paper and some extensive tests were necessary. However, the good report from the journal's referee and the advancement on the research shows that the outcome was worth the additional effort and time.
The progress on the black hole seeds was fast at first, but recent numerical difficulties have slowed down the project.
Overall, he is making decent progress as expected.
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| Strategy for Future Research Activity |
He will resubmit the paper on the Hall effect in a few weeks since the modifications are almost done. We expect it to be accepted given the good first referee report.
Another paper of numerical tests on the Hall effect should follow. Several simulations have already been performed and the paper should be shorter than the first one.
His simulations about binary star formation are almost finished, he will dedicate the next one or two month to their analyses and prepare a paper draft. The next project will be a more accurate study of binary star formation including all the non-ideal MHD effects with detailed diffusion coefficients based on realistic chemical evolution.
Along his study of star formation, he will keep his effort to solve the numerical problems of our project concerning black hole seeds.
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