IIP型超新星SN 2013 fs的第一天：来自震前加速气体的H $α$
First day of type IIP supernova SN 2013fs: H$α$ from preshock accelerated gas
摘要：
我探讨了在激波爆发后10.3h拍摄的光谱中，来自IIP型超新星SN 2013 fs周围的拱星壳层的H $α$发射的不对称性的起源。一个球形模型的H $α$发射的CS壳，考虑到由超新星辐射的震前气体加速允许我们成功地再现\ha H $α$配置文件。负责H $α$不对称的主要因素是加速CS震前气体（$\sim 3000$ \，km s $^{-1}$）的高速度和低H $α$ Sobolev光学深度与H $α$发射的光球掩星相结合。
英文摘要：
I explore the origin of an asymmetry of the H$α$ emission from a circumstellar (CS) shell around type IIP supernova SN 2013fs in the spectrum taken 10.3\,h after the shock breakout. A spherical model of the H$α$ emission from the CS shell that takes into account a preshock gas acceleration by the supernova radiation permits us to successfully reproduce the \ha H$α$ profile. Principal factors responsible for the H$α$ asymmetry are the high velocity of the accelerated CS preshock gas ($\sim 3000$\,km s$^{-1}$) and a low H$α$ Sobolev optical depth in a combination with an occultation of the H$α$ emission by the photosphere.
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