| Project/Area Number |
19K14774
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | Institute of Physical and Chemical Research |
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Principal Investigator |
ZHANG YICHEN 国立研究開発法人理化学研究所, 開拓研究本部, 基礎科学特別研究員 (50791943)
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| Project Period (FY) |
2019-04-01 – 2021-03-31
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| Project Status |
Completed (Fiscal Year 2020)
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| Budget Amount *help |
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
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| Keywords | Massive Star Formation / Accretion Disk |
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| Outline of Research at the Start |
We will test whether rotationally supported disks are a necessary channel for material to be accreted onto the protostars in massive star formation, by identifying the envelope-to-disk transition not only by kinematic signatures but also by chemical signatures. We will also examine how the existence of binary or multiple systems may affect the disk formation in massive star formation. We will observe the surrounding gas inside a few hundred au from massive protostars with the ALMA telescope via various molecular lines.
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| Outline of Final Research Achievements |
The whole project is to search, identify, and study the rotationally supported disks around massive protostars. We have successfully identified several sources with rotationally supported disks around forming massive stars. These observational results support a scenario that massive stars form in a similar way as low-mass stars, despite their strong radiation and kinematic feedbacks. Based on these observations, we have developed a method that can be used to search for disks, including hot-disk molecules and recombination lines. Based on the results and developed methods, we have successfully applied new observations which will extend the research.
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| Academic Significance and Societal Importance of the Research Achievements |
This project improved our understanding of the formation of massive stars. In particular the results support a scenario that massive stars form in a similar way as low-mass solar type stars. The method developed in this study can be applied to more targets to study massive star formation.
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