| Project/Area Number |
21H04998
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| Research Category |
Grant-in-Aid for Scientific Research (S)
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| Allocation Type | Single-year Grants |
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| Review Section |
Broad Section B
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| Research Institution | National Astronomical Observatory of Japan |
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Principal Investigator |
Guyon Olivier 国立天文台, ハワイ観測所, RCUH職員 (90399288)
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| Co-Investigator(Kenkyū-buntansha) |
増田 賢人 大阪大学, 大学院理学研究科, 准教授 (20874168)
小谷 隆行 大学共同利用機関法人自然科学研究機構(機構直轄研究施設), アストロバイオロジーセンター, 准教授 (40554291)
河原 創 国立研究開発法人宇宙航空研究開発機構, 宇宙科学研究所, 准教授 (90649758)
川島 由依 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 (40897691)
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| Project Period (FY) |
2021-07-05 – 2026-03-31
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| Project Status |
Granted (Fiscal Year 2024)
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| Budget Amount *help |
¥183,820,000 (Direct Cost: ¥141,400,000、Indirect Cost: ¥42,420,000)
Fiscal Year 2024: ¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2023: ¥27,040,000 (Direct Cost: ¥20,800,000、Indirect Cost: ¥6,240,000)
Fiscal Year 2022: ¥68,770,000 (Direct Cost: ¥52,900,000、Indirect Cost: ¥15,870,000)
Fiscal Year 2021: ¥72,930,000 (Direct Cost: ¥56,100,000、Indirect Cost: ¥16,830,000)
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| Keywords | Astronomy / Exoplanet / Exoplanets / Telescope / Adaptive Optics / Interferometry / Photonic / Optical Fiber / Spectroscopy / Coronagraphy / Telescopes / adaptive optics / wavefront control / exoplanet / photonics / interferometry / spectroscopy |
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| Outline of Research at the Start |
We will image and characterize giant planets in the inner parts of nearby planetary systems with the 8.2m Subaru Telescope. The observations will focus on inner planets to understand the architecture and evolution of planetary systems and their suitability to host habitable planets.
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| Outline of Annual Research Achievements |
The main technical components of the instruments have been completed. The development of the photonic chip circuit has been completed, with delivery of the chip to Subaru Telescope. The chip circuit includes both the nulling (canceling starlight) and wavefront measurement functions. The new 3000-actuator deformable mirror (DM) was delivered. Repair by the vendor was necessary due to an actuator defect. The defect was successfully fixed, and we have verified performance is good. The Adaptive Optics system upgrade design has been completed, including 3000-actuator DM, new visible light wavefront sensor, new calibration source. Components have been fabricated and tested in the laboratory and system installation at the telescope is ongoing.
We have started on-sky observations of exoplanets identified by astrometric acceleration, and have identified promising candidates we are following up as part of our ongoing survey. Our observations are targeting stars with sign of astrometric acceleration which indicates that there may be a companion. We are using the current extreme AO system and coronagraph to observe these stars to confirm planets.
We have also started to develop PSF calibration algorithm to accurately predict residual starlight in the science data. Results indicate we can gain a factor 10x in contrast.
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| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
We have started survey observations and are upgrading the instrument with the new adaptive optics (deformable mirror and wavefront sensor) and photonic nulling chip to augment performance. The photonic chip development has been completed successfully.
The main technical issue has been delay due to deformable mirror (DM) issue. This issue has now been fully resolved and we have mitigated delay by preparing for a quicker installation of the DM at the telescope. The DM is being installed in may 2024.
We are starting to obtain science results with identification of promising planet candidates from our ongoing survey. We are initially focusing on more distant orbits and will probe planets at smaller orbits as the instrument at the telescope is being upgraded.
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| Strategy for Future Research Activity |
We will be continuing our ongoing survey of exoplanets at the Subaru Telescope. We have several planet candidates we have identified that we will follow for confirmation. Thanks to both imaging data (taken by our system) and astrometric data (taken by the Gaia space mission), we will be able to confirm the orbit and mass of the exoplanets.
In the next few months we will complete the instrument upgrade at the telescope.
The first stage correction adaptive optics (AO) system will be upgraded from its current 188-element to 3000-element system including both visible and near-IR wavefront sensing. This AO upgrade will be completed in summer 2024. The photonic chip will be installed on the instrument in summer 2024.
Starting in fall 2024, we will use this new upgrades to probe planets in closer orbits.
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| Assessment Rating |
Interim Assessment Comments (Rating)
A: In light of the aim of introducing the research area into the research categories, the expected progress has been made in research.
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