2013 Fiscal Year Final Research Report
Colla@se of higher-entropy stellar core and long gamma-ray bursts
| Project/Area Number |
23740160
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Astronomy
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2011 – 2013
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| Keywords | 理論天文学 / 宇宙物理 / ガンマ線バースト |
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| Research Abstract |
The central engine of long-duration gamma-ray bursts has not been clarified yet. A system composed of a black hole and an accretion torus is promising candidate of their engine. Based on the latest observations and theoretical evolution models of massive stellar cores, I developed a hypothesis that the progenitor star of gamma-ray bursts should have higher entropy than ordinary supernova. By performing numerical relativity simulations, I studied the collapse of the higher entropy cores and clarified the dynamics of the black hole formation. Based on the simulation results, I showed that the properties of long-duration gamma-ray busts can be explained if the progenitor core has higher entropy as I assumed in the hypothisis.
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