| Project/Area Number |
22K14092
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 17010:Space and planetary sciences-related
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| Research Institution | National Institutes of Natural Sciences |
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Principal Investigator |
Nugroho Stevanus 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, 特任研究員 (90925968)
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| Project Period (FY) |
2022-04-01 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2024: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2023: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2022: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
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| Keywords | Exoplanet / Atmosphere / Non-homogeneous / NLTE / exoplanet / atmosphere / non-homogeneous / high-resolution / spectroscopy |
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| Outline of Research at the Start |
This research will study the atmosphere of tidally-locked exoplanets. We will find out the common chemical species in their atmosphere and how their distributions are affected by the planet's atmospheric dynamics using their high-spectral resolution emission and transmission spectra.
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| Outline of Annual Research Achievements |
We have published our finding on the detection of the two strongest OH emission vibrational bands from the day-side of WASP-33b using IRD Subaru data. We also have detected CO, H2O, and Fe emissions on the day-side of MASCARA-1b using CRIRES+ and constraining its atmospheric parameters. Currently, we have tested our CPU-based retrieval pipeline to be robust and used it to constrain various atmospheric properties of WASP-33b assuming chemical equilibrium. From the line-broadening of its emission spectrum, we found that the planet is tidally-locked consistent with the prediction. We also found that the atmosphere is slightly hotter and has a higher metallicity in the pre-eclipse than post-eclipse indicating an asymmetrical/non-homogenous atmosphere (relative to the sub-stellar point).
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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
Although the timeline and method have slightly changed, we learned a lot about how to perform atmospheric retrieval on high-resolution spectroscopy data robustly. We found that with the current development, it is more realistic and achievable to perform retrieval using pre-calculated cross-sections
For the chemical phase curve, however, there is a lot that needs to be investigated as we found that the interpretation of the results is a bit complicated. Especially when we have a non-homogenous atmosphere where line-masking effects by feature-rich opacities can lead to wrong interpretation. For example, if water abundance is high close to the morning terminator then it can mask the lines from other opacities in the morning terminator making them look unevenly distributed even if they are
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| Strategy for Future Research Activity |
I am planning develop our existing atmospheric retrieval pipeline to be able to perform free retrieval on the atmosphere of ultra-hot Jupiter more realistically and adopt the pipeline to the JAX environment GPU-based to make it run more efficiently. Lastly, once we publish the WASP-33b result, I am planning to perform a study using realistic spectra produced by 3D GCM simulation and investigate the robustness of the chemical phase-curve technique to retrieve the simulated properties as well as analyse other datasets that we have.
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