2022 Fiscal Year Final Research Report
Chondrule Formation: A New Lightning Model
| Project/Area Number |
18K03721
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17010:Space and planetary sciences-related
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
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| Project Period (FY) |
2018-04-01 – 2023-03-31
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| Keywords | コンドリュール / 微惑星 / 雷 |
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| Outline of Final Research Achievements |
In this study, we investigated the possibility that planetesimal formation by gravitational instability of the dust layer in the solar nebula generates lightning and leads to the formation of chondrules. Dust particles continue to accrete on the forming planetesimal, and it is found that the dust particles of different sizes collide with each other and become charged, generating a strong enough electric field to produce lightning. The thermal evolution of the heated dust particles was also investigated, and it was found that the dust particles melt and then decrease in temperature at an appropriate rate of temperature change. Thus, we have obtained a new model of chondrule formation in which lightning occurs during the formation of planetesimals and chondrules are also formed.
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| Free Research Field |
天文学・惑星科学
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| Academic Significance and Societal Importance of the Research Achievements |
微惑星が形成される際に雷が起こり，コンドリュールも形成されるという新しいコンドリュール形成モデルを得ることができた。これは，微惑星形成とコンドリュール形成が密接に関連していることを示す点でも，新しい成果である。これは，微惑星形成とコンドリュール形成が密接に関連していることを示す点でも新しい成果であり，学術的意義がある。
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