| 研究課題/領域番号 |
20J23342
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| 研究機関 | 京都大学 |
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研究代表者 |
方 其亮 京都大学, 理学研究科, 特別研究員(DC1)
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| 研究期間 (年度) |
2020-04-24 – 2023-03-31
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| キーワード | Supernvoa / Transient source / Spectroscopy |
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| 研究実績の概要 |
The relation between the progenitor mass and the kinetic energy of the explosion is a key toward revealing the explosion mechanism of stripped-envelope (SE) core-collapse (CC) supernovae (SNe). In this work, we present a method to derive this relation using the nebular spectra of SESNe, based on the correlation between [O I]/[Ca II], which measures the progenitor mass, and [O I] width, which measures the expansion velocity of the ejecta. Using hydrodynamic simulations, we trigger explosions with different kinetic energy and progenitor mass. The models are compared with observation. We find the mass-energy scaling relation required to explain the observed mass-velocity correlation. We further demonstrate helium-rich and helium-deficient SNe follow the same mass-energy scaling relation.
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| 現在までの達成度 (区分) |
現在までの達成度 (区分)
2: おおむね順調に進展している
理由
We have successfully performed hydrodynamic models with different progenitor mass and kinetic energy. We further build up the method to connect the properties of the models with the observed quantities, including the scaling relation between the oxygen mass and [O I]/[Ca II] ratio, and the construction of the [O I] profile from the ejecta structure. These models and the practice can be applied in future works. A manuscript is now in preparation.
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| 今後の研究の推進方策 |
In the current work, the mass-energy relation is built up based on the nebular spectroscopy, biasing toward the dense inner core. Our future work aims to compare the result in this work with the ejecta mass-energy relation built up based on the early phase observation, which measures the properties of the outermost region. The systematic comparison of the late phase and early phase observation provides us the unique chance to scan through the ejecta from outer to inner region (as computed tomography, or CT), which is crucial to understand the ejecta structure.
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