On the Energy Sources of the Most Luminous Supernova ASASSN-15lh
On the Energy Sources of the Most Luminous Supernova ASASSN-15lh
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DOI：
10.3847/1538-4357/aba95b
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发表时间：
2020-07
期刊：
影响因子：
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通讯作者：
Long Li;Z. Dai;Shan-Qin Wang;S. Zhong
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文献类型：
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作者：
Long Li;Z. Dai;Shan-Qin Wang;S. Zhong
在本文中，我们研究了最亮超新星 ASASSN-15lh 的能源模型。我们重新审视了 Chatzopoulos 等人采用的喷射物-环星介质 (CSM) 相互作用 (CSI) 模型和 CSI 加磁星自旋下降与完全伽马射线/X 射线捕获的模型，发现这两个模型无法拟合 ASASSN-15lh 的辐射光曲线 (LC)。因此，我们考虑采用具有伽马射线/X射线泄漏效应的CSI加磁星模型来消除理论LC的后期过量。我们发现这个修改后的模型可以重现 ASASSN-15lh 的辐射热液相色谱。此外，我们构建了一个新的混合模型（即CSI加后备模型），发现它也可以重现ASASSN-15lh的测辐射热LC。假设后退吸积到流出物的转换效率 (η) 通常为 ∼10−3，我们得出吸积的总质量为 ∼3.9 M⊙。两个模型中推断的 CSM 质量相当大，表明前身可能经历了贫氢物质的喷发，随后发生了高能核心塌陷爆炸，留下了磁星或黑洞。
In this paper, we investigate the energy-source models for the most luminous supernova ASASSN-15lh. We revisit the ejecta–circumstellar medium (CSM) interaction (CSI) model and the CSI plus magnetar spin-down with full gamma-ray/X-ray trapping, which were adopted by Chatzopoulos et al., and find that the two models cannot fit the bolometric light curve (LC) of ASASSN-15lh. Therefore, we consider a CSI plus magnetar model with the gamma-ray/X-ray leakage effect to eliminate the late-time excess of the theoretical LC. We find that this revised model can reproduce the bolometric LC of ASASSN-15lh. Moreover, we construct a new hybrid model (i.e., the CSI plus fallback model), and find that it can also reproduce the bolometric LC of ASASSN-15lh. Assuming that the conversion efficiency (η) of fallback accretion to an outflow is typically ∼10−3, we derive that the total mass accreted is ∼3.9 M⊙. The inferred CSM mass in the two models is rather large, indicating that the progenitor could have experienced an eruption of hydrogen-poor materials followed by an energetic core-collapse explosion leaving behind a magnetar or a black hole.