An analytical density profile of dense circumstellar medium in Type II supernovae

An analytical density profile of dense circumstellar medium in Type II supernovae
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II型超新星中致密星周介质的解析密度剖面

DOI:
10.1093/pasj/psab063
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发表时间:
2021
影响因子:
2.3
通讯作者:
Shigeyama Toshikazu
Shigeyama Toshikazu
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Tsuna Daichi;Takei Yuki;Kuriyama Naoto;Shigeyama Toshikazu

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对II型超新星的观测表明,它们的大部分祖先在核心坍缩前数年至数十年经历了增强的质量损失,形成了致密的星周介质(CSM)。假设CSM是由一个单一的大规模喷发事件,我们分析其密度分布模型。我们发现,一个双幂律分布,其中内(外)幂律指数的特征值为-1.5(-10至-12),给出了一个很好的拟合使用辐射流体动力学模拟获得的CSM分布。我们的配置文件的CSM是很好地描述了只有两个参数,过渡半径r * 和密度atr=r*(alternativelyr* 和总CSM质量)。我们鼓励未来的研究,包括这一配置文件,如果可能的话,从相互作用供电的瞬态排放建模时。
Observations of Type II supernovae imply that a large fraction of their progenitors experience enhanced mass loss years to decades before core collapse, creating a dense circumstellar medium (CSM). Assuming that the CSM is produced by a single mass eruption event, we analytically model its density profile. We find that a double power-law profile, where the inner (outer) power-law index has a characteristic value of −1.5 (−10 to −12), gives a good fit to the CSM profile obtained using radiation hydrodynamical simulations. With our profile the CSM is well described by just two parameters, the transition radiusr*and density atr=r*(alternativelyr*and the total CSM mass). We encourage future studies to include this profile, if possible, when modelling emission from interaction-powered transients.
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