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arXiv 1707.02538astro-ph.HE
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不对称CSM包围的IIn型超新星SN 2013 L的光学和IR观测

Optical and IR observations of SN 2013L, a Type IIn Supernova surrounded by asymmetric CSM

Jennifer E. Andrews, Nathan Smith, Curtis McCully, Ori D. Fox, S. Valenti, D. A. Howell

摘要:

我们目前的光学和近红外测光和光谱SN 2013 L爆炸后的第一个四年。SN 2013 L是一颗中等亮度(M $_{r}$ = -19.0)的IIn型超新星(SN),显示出与星周介质(CSM)发生强烈激波相互作用的迹象。CSM的相互作用在最初的200天内等于或强于SN 1988 Z,并且在爆炸后的所有时期都可以观察到。光学光谱显示,多组分氢谱线在第33天出现,并在接下来的几年中持续并缓慢演变。到第1509天,H $α$发射仍然很强,并显示出多个峰,暗示CSM在SN周围的圆盘或环面中。SN 2013 L是一个不断增长的SNe IIn子集的一部分,它显示了强烈的CSM相互作用特征和SN喷出物光球的基本宽线。由于在Pa $β$中观察到相同的轮廓,因此蓝色H $α$发射凸起的存在和红色峰值的缺乏似乎不是由于尘埃遮蔽。相反,这表明SN的近侧有高浓度的物质,或者圆盘的倾斜度大致是边缘上的,并暗示SN 2013 L是一个巨大的交互式双星系统的一部分。贯穿整个观测过程的窄H $α$ P-Cygni谱线测量到的祖先外流速度为80- 130 km/s $^{-1}$,这种速度通常与极端红超巨星、黄超巨星或亮蓝变风有关。这种祖细胞情况也与推断的祖细胞质量损失率0.3 - 8.0 $\times$ 10 $^{-3}$ M $_{sun}$ yr $^{-1}$一致。

英文摘要:

We present optical and NIR photometry and spectroscopy of SN 2013L for the first four years post-explosion. SN 2013L was a moderately luminous (M$_{r}$ = -19.0) Type IIn supernova (SN) that showed signs of strong shock interaction with the circumstellar medium (CSM). The CSM interaction was equal to or stronger to SN 1988Z for the first 200 days and is observed at all epochs after explosion. Optical spectra revealed multi-component hydrogen lines appearing by day 33 and persisting and slowly evolving over the next few years. By day 1509 the H$α$ emission was still strong and exhibiting multiple peaks, hinting that the CSM was in a disc or torus around the SN. SN 2013L is part of a growing subset of SNe IIn that shows both strong CSM interaction signatures and the underlying broad lines from the SN ejecta photosphere. The presence of a blue H$α$ emission bump and a lack of a red peak does not appear to be due to dust obscuration since an identical profile is seen in Pa$β$. Instead this suggests a high concentration of material on the near-side of the SN or a disc inclination of roughly edge-on and hints that SN 2013L was part of a massive interactive binary system. Narrow H$α$ P-Cygni lines that persist through the entirety of the observations measure a progenitor outflow speed of 80--130 km s$^{-1}$, speeds normally associated with extreme red supergiants, yellow hypergiants, or luminous blue variable winds. This progenitor scenario is also consistent with an inferred progenitor mass-loss rate of 0.3 - 8.0 $\times$ 10$^{-3}$ M$_{sun}$ yr$^{-1}$.

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