Theoretical Models for Supernova with Peculiar Light Curves

具有特殊光曲线的超新星理论模型

基本信息

批准号：
62540183
负责人：
NOMTO Ken'ichi
金额：
$ 1.09万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1987
资助国家：
日本
起止时间：
1987 至 1988
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62540183/
关键词：
Supernova SN 1987A X-ray -ray Radioactivity nucleosynthesis Pulsar 元素合成パルサーガンマ線術暫波

项目摘要

SN 1987A provides us with an excellent material to test the theory of massive star evolution, nucleosynthesis, and supernova explosion. Presupernova evolution of the progenitor, hydrodynamics of explosion, explosive nucleosynthesis, optical, X-ray and -ray light curves due to ^<56>Co decay are calculated and compared with the observations of SN 1987A.1. The unique evolution of the progenitor in the HR diagram can be understood in terms of mass loss and mixing. The mass loss drives the star to move from a blue to red supergiant. The excursion from the red back to the blue occurs if the hydrogen-rich envelope is metal deficient and becomes sufficiently helium-rich due to mixing.2. The light curves in all wave bands indicate the explosion energy of E/M_<env> = 1.5 0.5 X 10^<50> erg/M<of sun>, production of ^<56>Ni with M_<Ni> - 0.07 M<of sun>. The plateau-like peak is found to be formed by the hydrogen recombination front and lasts longer if the hydrogen layer is deeper. This indicates the mixing of hydrogen into the deep interior.3. The distribution of heavy elements in the ejecta is inferred also from the X-ray and -ray light curves. The early emergence of X-ray and -ray indicate the mixing of ^<56>Ni into the hydrogen-rich envelope. Flat X-ray light curve observed by Ginga would be due to the clumpy structure of the core.If the recent slowdown of the decline of the optical light curve is due to the contribution from another energy source, it would be either radioactive ^<57>Co or the buried neutron star. We offer predictions for future light curves.

SN 1987a为我们提供了一种出色的材料，以测试大规模恒星进化，核合成和超新星爆炸的理论。祖细胞的发展，爆炸的流体动力学，爆炸性核合成，光学，X射线和 - 射线光曲线是 ^<56> CO衰减引起的，并与SN 1987a.1的观察结果进行了比较。人力资源图中祖细胞的独特演变可以从质量损失和混合方面理解。大规模损失驱使恒星从蓝色变为红色超级巨人。如果富含氢的包膜是金属缺乏，并且由于混合而变得足够充足的氦气2。所有波带中的光曲线表明E/M_ <env>的爆炸能量= 1.5 0.5 0.5 x 10 ^<50> erg/m <的sun>，生产 ^<56> ni，用m_ <ni> -0.07 m <of太阳>。发现高原状峰是由氢重组前端形成的，如果氢层更深，则持续更长的时间。这表明将氢混合到深内部。3。从X射线和 - 射线光曲线也推断出弹出中重元素的分布。 X射线和-Ray的早期出现表明将 ^<56> Ni混合到富氢的包膜中。 Ginga观察到的平坦X射线光曲线将是由于核心的块状结构所致。我们为未来的光曲线提供预测。