| Project/Area Number |
23K22542
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| Project/Area Number (Other) |
22H01271 (2022-2023)
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Multi-year Fund (2024)
Single-year Grants (2022-2023) |
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| Section | 一般 |
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| Review Section |
Basic Section 16010:Astronomy-related
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
HULL CHARLES 国立天文台, アルマプロジェクト, 特別客員研究員 (70814755)
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| Co-Investigator(Kenkyū-buntansha) |
サヌエザ パトリシオ 国立天文台, アルマプロジェクト, 特任助教 (70769348)
中村 文隆 国立天文台, 科学研究部, 准教授 (20291354)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2024)
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| Budget Amount *help |
¥17,420,000 (Direct Cost: ¥13,400,000、Indirect Cost: ¥4,020,000)
Fiscal Year 2024: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2023: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2022: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000)
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| Keywords | star formation / High-mass star formation / Magnetic Fields / binary stars / polrization / dust / magnetic fields / Star formation / Polarization / Magnetic fields / Binary stars / Dust |
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| Outline of Research at the Start |
How does the magnetic field affect the formation of binary stars? This is a major outstanding question, given that half of Sun-like stars in the Milky Way Galaxy are in binary systems. Recent surveys by other telescopes have shown that very young star-forming sources fragment into binary systems on two different size scales as a result of two different formation mechanisms. Using cutting-edge data from the ALMA observatory, we will test these formation hypotheses in order to gain a better understanding of the origin of binary sources in our Galaxy.
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| Outline of Annual Research Achievements |
The main achievement is that we have submitted the first article studying a binary system, including the magnetic field, in the high-mass regime. This article was led by the hired KAKENHI postdoc.
In this work we find a binary system forming immersed in a magnetic field having a hourglass morphology. All evidence points to a strongly magnetized environment: mass-to-flux ratio of 1.43, no coherent velocity gradients at large scales, lack of core/disk rotation, and absence of molecular outflows. However, in spite of being a strong regulator, the magnetic field fails to prevent the formation of the binary system.
In addition, we have carried out a large portion of data calibration and imaging of the main data set.
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| Current Status of Research Progress |
Current Status of Research Progress
3: Progress in research has been slightly delayed.
Reason
The main data set to be used during this research arrived later than expected. However, this inconvenient did not stop to continue addressing the main scientific questions using the other data sets part of the project.
Because we had scripts ready, now with the main data in hand, we move faster than initially expected and we believe we will complete our project on time by the end of the fiscal year.
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| Strategy for Future Research Activity |
The team, led by the hired postdoc, is working and will continue working hard to complete the data reduction (calibration, self-calibration, continuum imaging, and line imaging) as soon as possible.
The first publication of ALPPS will consist in a summary paper led by the hired postdoc. In this paper, we will determine the outflow orientation and search for the presence of velocity gradients and calculate their direction. These quantities will be compared with the magnetic field orientation to evaluate the importance of the magnetic field.
The second publication will combine the information extracted from paper 1 with the binary systems (information published in earlier works). We will then know if the magnetic field has any role in determining binary/multiple systems.
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