| Project/Area Number |
20540239
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Astronomy
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| Research Institution | Nagano National College of Technology |
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Principal Investigator |
OHNISHI Kouji Nagano National College of Technology, 一般科, 教授 (20290744)
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| Project Period (FY) |
2008 – 2010
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| Project Status |
Completed (Fiscal Year 2010)
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| Budget Amount *help |
¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Fiscal Year 2010: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2009: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2008: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
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| Keywords | 重力マイクロレンズ現象 / 多胡事象 / 多胡天体 / 褐色惑星 / 質量分布関数 / あかり / MOA / 浮遊惑星 / 褐色矮星 / 胡天体 / OGLE-2007-BLG-224 / MOA-2007-BLG-192 / 赤外線観測衛星「あかり」 / 重力レンズ / 銀河モデル |
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| Research Abstract |
The "TAGO event" is the first microlensing phenomenon confirmed in the near-field star. In a standard structure of the Galaxy, the probability that this phenomenon occurs is very small. However, it might be explained this phenomenon by thinking ; "The low mass side of the mass distribution function is larger than that of a standard model." From the microlensing observation by MOA group, we found that the value of the mass distribution function on the low mass side is twice larger than that of a standard model by discovering the microlensing due to neighborhood brown dwarf and by discovering the "floating planet". These suggest that the TAGO Object is a brown dwarf and/or a floating planet. These will be clarified by the measurement of the proper motion in the near future.
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