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arXiv 1802.05152astro-ph.HE
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超新星与星周盘的相互作用

Interaction of a Supernova with a Circumstellar Disk

Austin T. McDowell, Paul C. Duffell, Daniel Kasen

摘要:

超新星(SN)喷出物和致密的星周介质(CSM)之间的相互作用可以为明亮的光变曲线提供动力,并在光谱中产生窄的发射线。虽然相互作用的理论研究通常假设球对称CSM,但有观测迹象表明,某些SN周围的气体具有盘状几何形状。在这里,我们使用移动网格流体动力学模拟研究的SN与磁盘的相互作用,并确定如何动态和可观察到的签名可能取决于磁盘的质量,厚度和径向范围。我们发现,简单的修改标准球对称标度律可以用来描述的相互作用冲击的传播和加热速率。我们使用由此产生的冲击加热率,以获得近似的热光变曲线,并提供分析公式,可用于生成简单的合成光变曲线一般的超新星磁盘的相互作用。对于某些磁盘参数和爆炸能量,我们能够产生类似于超亮SN中所见的光度。由于SN喷出物可以围绕CSM盘流动并吞没CSM盘,因此相互作用区域可以变得嵌入,并且从某些视角来看,指示相互作用的窄发射线可以被隐藏。

英文摘要:

Interaction between supernova (SN) ejecta and a dense circumstellar medium (CSM) can power a luminous light curve and create narrow emission lines in the spectra. While theoretical studies of interaction often assume a spherically symmetric CSM, there are observational indications that the gas surrounding some SN has a disk-like geometry. Here, we use moving-mesh hydrodynamics simulations to study the interaction of a SN with a disk and determine how the dynamics and observable signatures may depend on the disk mass, thickness, and radial extent. We find that simple modifications to standard spherically-symmetric scaling laws can be used to describe the propagation and heating rate of the interaction shock. We use the resulting shock heating rates to derive approximate bolometric light curves, and provide analytic formulas that can be used to generate simple synthetic light curves for general supernova-disk interactions. For certain disk parameters and explosion energies, we are able to produce luminosities akin to those seen in super-luminous SN. Because the SN ejecta can flow around and engulf the CSM disk, the interaction region may become embedded and from certain viewing angles the narrow emission lines indicative of interaction may be hidden.

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