| Project/Area Number |
23K19059
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| Research Category |
Grant-in-Aid for Research Activity Start-up
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| Allocation Type | Multi-year Fund |
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| Review Section |
0204:Astronomy, earth and planetary science, and related fields
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| Research Institution | Tohoku University |
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Principal Investigator |
HAMIDANI HAMID 東北大学, 理学研究科, 特任助教 (50979119)
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| Project Period (FY) |
2023-08-31 – 2025-03-31
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| Project Status |
Granted (Fiscal Year 2023)
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| Budget Amount *help |
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2024: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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| Keywords | Gamma-ray bursts / Neutron stars / Neutron star mergers / Relativistic jets / gravitational waves / nucleosynthesis / radiative transfer / stars: neutron / ISM: jets and outflows |
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| Outline of Research at the Start |
Here, in order to measure heavy elements synthesized in NS merger events, I propose to perform end-to-end multi-dimensional numerical simulations from the actual merger to the kilonova emission. This will help estimate the contribution of NS mergers to synthesis of heavy elements in the Universe.
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| Outline of Annual Research Achievements |
The objective of this project is to investigate neutron star mergers, which are anticipated to generate short gamma-ray bursts and instigate the nucleosynthesis of heavy elements. The subsequent radioactive decay of these elements is projected to give rise to a distinctive astrophysical event known as a "kilonova."
Collaborating with theoretical specialists, we investigated the impact of relativistic jets on kilonova emissions. We have demonstrated, for the first time, that late-stage relativistic jets (commonly observed in most short gamma-ray bursts) interact with the ejecta from neutron star mergers to produce an early blue emission. Our findings suggest that this interaction can elucidate the enigmatic early "blue early kilonova" emissions observed.
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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
The project is progressing smoothly and is on track to achieve its goals.
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| Strategy for Future Research Activity |
I plan to proceed as intended. The next step involves conducting calculations for the kilonova emission in a highly realistic manner using state-of-the-art hydrodynamic and radiative transfer simulations.
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