Searching for short-period planets around intermediate-mass stars using Kyoto-Okayama 3.8m telescope and a new dedicated spectrograph
| Project/Area Number |
18H03736
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Review Section |
Medium-sized Section 17:Earth and planetary science and related fields
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
Sato Bunei 東京工業大学, 理学院, 教授 (40397823)
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| Project Period (FY) |
2018-04-01 – 2022-03-31
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| Project Status |
Completed (Fiscal Year 2021)
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| Budget Amount *help |
¥44,590,000 (Direct Cost: ¥34,300,000、Indirect Cost: ¥10,290,000)
Fiscal Year 2021: ¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2020: ¥5,330,000 (Direct Cost: ¥4,100,000、Indirect Cost: ¥1,230,000)
Fiscal Year 2019: ¥13,520,000 (Direct Cost: ¥10,400,000、Indirect Cost: ¥3,120,000)
Fiscal Year 2018: ¥20,930,000 (Direct Cost: ¥16,100,000、Indirect Cost: ¥4,830,000)
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| Keywords | 太陽系外惑星 / 高分散分光 / 視線速度 |
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| Outline of Final Research Achievements |
This research tried to conduct a new exoplanet search targeting intermediate-mass giants avoiding uncertainties in mass estimation for central stars and small number of sample stars inherent in evolved intermediate-mass stars. First we developed a machine-learning-based method to estimate metallicity of giant stars using multi-band photometric data, which can be used to efficiently identify intermediate-mass giants. Next we developed and installed a new high-dispersion spectrograph to Kyoto-Okayama 3.8m telescope for a dedicated exoplanet search. Lastly, we discovered a new short-period giant-planet candidate orbiting around an intermediate-mass giant using Okayama 188cm telescope, which have been rarely discovered from previous surveys.
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| Academic Significance and Societal Importance of the Research Achievements |
これまでほとんど発見されていなかった、2太陽質量以上の中質量巨星を周回する短周期惑星候補を発見し、観測的・理論的研究に新たな方向性を与えた。また、京大岡山3.8m望遠鏡に初めて可視高分散分光器を設置し、視線速度精密測定による系外惑星探索やその他の多様な可視高分散分光観測を実施する環境を創出した。
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Report
(5 results)
Research Products
(1 results)
