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arXiv 1812.03076astro-ph.HE
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SN 2017年的观测揭示了一颗Ic型超新星的激波爆发发射和一颗大质量祖星

Observations of SN 2017ein Reveal Shock Breakout Emission and A Massive Progenitor Star for a Type Ic Supernova

Danfeng Xiang, Xiaofeng Wang, Jun Mo, Lingjun Wang, Stephen Smartt, Morgan Fraser, Shuhrat A. Ehgamberdiev, Davron Mirzaqulov, Jujia Zhang, Tianmeng Zhang, Jozs… 展开作者

Danfeng Xiang, Xiaofeng Wang, Jun Mo, Lingjun Wang, Stephen Smartt, Morgan Fraser, Shuhrat A. Ehgamberdiev, Davron Mirzaqulov, Jujia Zhang, Tianmeng Zhang, Jozsef Vinko, J. Craig Wheeler, Griffin Hosseinzadeh, D. Andrew Howell, Curtis McCully, James M DerKacy, E. Baron, Peter Brown, Xianfei Zhang, Shaolan Bi, Hao Song, Kaicheng Zhang, A. Rest, Ken'ichi Nomoto, Alexey Tolstov, Sergei Blinnikov

摘要:

我们提出了附近的Ic型超新星SN 2017 ein的光学和紫外观测,以及从早期观测和发现前哈勃太空望远镜(HST)图像中详细分析其祖星属性。光变曲线从爆炸后1天内开始到爆炸后275天,光谱范围从爆炸后2天到90天。与SN 2007 gr和SN 2013 ge等其他正常SNe Ic相比,\mbox{SN 2017ein}在早期阶段似乎具有更显著的C{ \footnotesize II}吸收和更高的膨胀速度,这表明喷出物质量相对较低。对\mbox{SN 2017ein}获得的最早的光度测定显示了冲击冷却的迹象。通过包含激波冷却分量得到的最佳拟合给出了包层质量的估计值为$\sim$ 0.02 M $_{\odot}$,恒星半径为8 $\pm$ 4 R $_{\odot}$。检查HST WFPC 2拍摄的爆炸前图像,我们发现SN位置与发光的蓝色点状源一致,一场灭绝-M $_V$ $\sim$ $-$ 8.2等和M $_I$ $\sim$ $-$ 7.7等的校正绝对星等。观测结果与理论模型的比较表明,对应的源要么是一颗WR星,要么是一颗双星,其成员有很高的初始质量,或者是一个年轻的致密星团。为了进一步区分不同的情况,需要在SN消失后重新访问具有HST的祖细胞的部位。

英文摘要:

We present optical and ultraviolet observations of nearby type Ic supernova SN 2017ein as well as detailed analysis of its progenitor properties from both the early-time observations and the prediscovery Hubble Space Telescope (HST) images. The optical light curves started from within one day to $\sim$275 days after explosion, and optical spectra range from $\sim$2 days to $\sim$90 days after explosion. Compared to other normal SNe Ic like SN 2007gr and SN 2013ge, \mbox{SN 2017ein} seems to have more prominent C{\footnotesize II} absorption and higher expansion velocities in early phases, suggestive of relatively lower ejecta mass. The earliest photometry obtained for \mbox{SN 2017ein} show indications of shock cooling. The best-fit obtained by including a shock cooling component gives an estimate of the envelope mass as $\sim$0.02 M$_{\odot}$ and stellar radius as 8$\pm$4 R$_{\odot}$. Examining the pre-explosion images taken with the HST WFPC2, we find that the SN position coincides with a luminous and blue point-like source, with an extinction-corrected absolute magnitude of M$_V$$\sim$$-$8.2 mag and M$_I$$\sim$$-$7.7 mag.Comparisons of the observations to the theoretical models indicate that the counterpart source was either a single WR star or a binary with whose members had high initial masses, or a young compact star cluster. To further distinguish between different scenarios requires revisiting the site of the progenitor with HST after the SN fades away.

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