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Studies on Hypernovae and Gamma-Ray Bursts

超新星和伽马射线爆发的研究

基本信息

批准号：
12640233
负责人：
NOMOTO Kenichi
金额：
$ 2.18万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2001
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640233/
关键词：
gamma-ray burst supernova hypernova energy black hole stellar evolution nucleosynthesis spectra

项目摘要

Some gamma-ray bursts are likely to be induced by hypernovae. We have studied several properties of three hypernovae, Sne 1998bw, 1999as, and 2002ap, and tried to clarify their 1) optical properties, 2) mechanisms of explosions and gamma-ray emissions, and 3) evolutionary origins. Our findings are summarized as follows :1) We first modeled spectra of SN 1998bw to compare with observations and es-timated that its explosion energy is about 30 times larger than ordinary supernovae (Sne), its progenitor mass is about 40 solar mass, and the ejected mass of 56Ni is about a half solar mass.2) For SN 1999as, we have found that this hypernova is the explosion of 50 solar mass star, its explosion energy is 40 times the ordinary Sne, and most strikingly the ejected mass of 56Ni amounts to 4 solar mass, which is 8 times larger than SN 1998bw.3) Most recent hypernova SN 2002ap is found to be a moderate explosion The amount of 56Ni is 0.1 solar mass, similar to the ordinary Sne, its progenitor mass is 20-25 solar mass, being similar to ordinary Sne. However, its explosion energy is about 5 times larger than ordinary Sne, which indicates that SN 2002ap is a hypernova. In this way, SN 2002ap has properties between the ordinary Sne and hypernovae, which is a new finding and provide interesting example to study the gamma-ray burst - super- nova/hypernova connection.

有些伽玛射线暴可能是由超新星引起的。我们研究了三颗超新星Sne 1998 bw、1999 as和2002 ap的一些性质，试图阐明它们的1）光学性质，2）爆炸和γ射线发射机制，3）演化起源。我们的研究结果总结如下：1）我们首先对SN 1998 bw的光谱进行了模拟，并与观测结果进行了比较，估计其爆炸能量约为普通超新星的30倍，其前身质量约为40个太阳质量，而56 Ni的抛射质量约为半个太阳质量。2）对SN 1999 as，我们发现该超新星是50个太阳质量的星星的爆炸，其爆炸能量是普通超新星的40倍，最引人注目的是56 Ni的抛射质量为4个太阳质量，比SN 1998 bw大8倍。它的前身质量是20-25太阳质量，与普通的Sne相似。但它的爆炸能量比普通的Sne大5倍左右，这表明SN 2002 ap是一颗超新星。因此，SN 2002 ap具有介于普通超新星和超新星之间的性质，这是一个新的发现，为研究γ射线暴-超新星/超新星联系提供了有趣的实例。