Research Interest
私は宇宙で起こる様々な爆発現象に興味があります。
特に注目している研究対象は、超新星爆発、Fast Blue Optical Transients (FBOTs), そして潮汐破壊現象です。
これらの爆発現象を、理論計算や望遠鏡による観測など様々な角度から研究しています。
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超新星爆発
When a star reaches the endpoint of its evolution, it explodes by thermonuclear runaway or gravitational collapse, resulting in a supernova.
At this time, it becomes so brightly that we can observe them even if they occur outside the Milky Way.
With the observational data and theoretical calculations for the physical processes of the explosion, I am approaching the nature of supernovae and the final stage of stellar evolution, which still remains unclear.
Related Papers:
Uno, Maeda, Nagao et al. 2023 /
Uno, Nagao, Maeda et al. 2023
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Fast Blue Optical Transients
FBOTs are peculiar transients, which show rapid rising and decay with high luminosity.
The time scale is much shorter than that of a supernova.
Besides the peak luminosity is roughly 100 times brighter than that of a supernova.
I suspect that FBOTs are originating from different physical mechanisms than supernovae.
I am very interested in the enigmatic phenomena and it is one of our main research topics.
Related Papers:
Uno & Maeda 2020a /
Uno & Maeda 2023
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潮汐破壊現象
When a star approaches close to a supermassive black hole, the star is destroyed due to the too strong gravity of the black hole.
This phenomenon is known as a TDE. In the classical picture, TDEs are bright in X-rays.
However, some new-generation survey observations have discovered TDEs that are bright in the optical/ultraviolet (UV) wavelengths.
The radiation mechanisms of optical/UV-bright TDEs are intensively under discussion, but it is still unknown.
I am trying to explore the origin of optical/UV-bright TDEs.
Related Papers:
Uno & Maeda 2020b
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Approaches
To reveal the nature of these transients, we use both theoretical and observational approaches.
In theoretical studies, I have been performing order estimates and numerical simulations.
I plan to work on radiation-hydrodynamics calculations in the future.
On the other hand, in observational studies, I use the Seimei 3.8m telescope (Kyoto University), the Kanata 1.5m telescope (Hiroshima University), and the Subaru 8m telescope.
I try to perform rapid follow-up observations for the enigmatic transients and to get closer to the origin of the object.
