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arXiv 2502.09752astro-ph.HE
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类似超新星1987A的长上升期II型超新星——II. 一个描述这些事件的新解析模型

Long-rising Type II supernovae resembling supernova 1987A -- II. A new analytical model to describe these events

M. L. Pumo, S. P. Cosentino

AI总结:

本文提出描述SN 1987A类富氢超新星爆炸后演化的新解析模型,可再现其热辐射光变曲线与膨胀速度,并给出推断前身星物理参数的Ni相关标度关系。

摘要:

为了增进我们对类似超新星(SN)1987A天体,以及更一般地对富氢超新星的认识,我们开发了一个新的解析模型来描述它们爆炸后的演化。该模型的显著特点是能够评估发射光度和超新星膨胀速度,同时考虑抛射物质的复合、在计算复合锋面位置时计入56Ni衰变导致的加热效应,以及存在一个非同源膨胀的外部薄壳。在本文中,我们介绍该模型,并将其与SN 1987A的观测进行比较,表明该模型能够准确再现其热辐射光变曲线和膨胀速度。我们还研究了富氢超新星中的模型简并问题,以及将SN 1987A类天体这一子群“标准化”的可能性。此外,我们基于模型提出了新的依赖于Ni的关系,这些关系将1987A类超新星热辐射光变曲线的某些特征(即峰值光度及其宽度)与其前身星在爆炸时的主要物理性质(即抛射质量、爆炸能量、爆炸时前身星半径以及抛射物中56Ni的含量)联系起来,并表明这些关系与真实超新星的观测高度吻合。我们还从模型中推导出新的标度关系;一旦仅知道SN 1987A类天体的测光行为,这些关系就可用于估计超新星前身星在爆炸时的主要物理性质。

英文摘要:

With the aim of improving our knowledge on supernova (SN) 1987A-like objects and, more in general, on H-rich SNe, we have developed a new analytic model to describe their post-explosive evolution. The distinctive features of this model are the possibility to evaluate the emitted luminosity and the SN expansion velocity, taking into account the recombination of the ejected material, the heating effects due to the \chem{56}{Ni} decay in the computation of the recombination front position, and the presence of an outer thin shell not-homologously expanding. In this paper, we present the model and a comparison with observations of SN 1987A, showing that its bolometric light curve and expansion velocity are accurately reproduced by the model. We also investigate the modeling degeneration problem in H-rich SNe and the possibility to ``standardize'' the subgroup of SN 1987A-like objects. Moreover we present new Ni-dependent relationships, based on our model, which link some features of the bolometric light curve of 1987A-like SNe (namely, the peak luminosity and its width) with the main physical properties of their progenitor at the explosion (i.e.~the ejected mass, the explosion energy, the progenitor radius at the explosion, and the amount of \chem{56}{Ni} present in the ejecta), showing that such relations are in excellent agreement with observations of real SNe. From our model, we also deduce new scaling relations which may be used for estimating the main SN progenitor's physical properties at the explosion, once only the photometric behaviour of the SN 1987A-like object is known.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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