| Project/Area Number |
15K17606
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
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| Project Period (FY) |
2015-04-01 – 2018-03-31
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| Project Status |
Completed (Fiscal Year 2017)
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| Budget Amount *help |
¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Fiscal Year 2017: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2016: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2015: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
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| Keywords | 惑星形成 / 電波観測 / 偏光 / 原始惑星系円盤 / ダスト / 惑星 / 偏光観測 / ミリ波 |
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| Outline of Final Research Achievements |
How do planets form? Recent astronomical observations have a great potential to answer this question by directly observing planet-forming disks. In this work, we have used the world-largest radio telescope ALMA to measure the solid materials in the disks, which are believed to be the seeds of planets. First of all, we have theoretically proven that the grain size can be constrained by millimeter-wave polarization observations due to scattering. Furthermore, we have performed ALMA polarimetric observations by ourselves and found the predicted pattern of polarization with ALMA for the first time. Moreover, by modeling the results of polarization, we have constrained the grain size to be 100 micron, which is much lower than expected.
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