论文标题

研究IB Supernova型SN 2017IRO的观察性能

Investigating the observational properties of Type Ib supernova SN 2017iro

论文作者

Kumar, Brajesh, Singh, Avinash, Sahu, D. K., Anupama, G. C.

论文摘要

我们报告了在附近($ \ sim $ \,31 mpc)Galaxy NGC 5480中发生的超新星(SN)2017IRO的光学成像和低分辨率光谱监测的结果。相对于$ b $ band最大值,后续观测值范围为 - \,7至 +\,266 d。在$ v $ -band中,($ m_ {v} $)\,= \,$ - 17.76 \ pm0.15 $ mag and Bolometric Luminosition(log $ _ {10} $ \,L)中等发光的IB SN。 SN 2017IRO的整体光曲线演变与早期(最高$ \ sim $ 100 d)和晚期($> $ 150 d)的SN 201AU和SN 2009JF相似。两种\ ion {fe} {2}5169Å\ \ \ \ ion {He} {1}5876Å\的线速度是$ \ sim $ \,9000 km s $^{ - 1} $。 Nebular相光谱的分析($ \ sim $ \,+209 d)表示氧气质量为$ \ sim $ \,0.35 m $ _ {\ odot} $。 The smaller [\ion{O}{1}]/[\ion{Ca}{2}] flux ratio of $\sim$\,1 favours a progenitor with a zero-age main-sequence mass in the range $\sim$\,13--15 M$_{\odot}$, most likely in a binary system, similar to the case of iPTF13bvn.爆炸参数是通过将不同的分析模型应用于SN 2017IRO的准亮度光曲线来估计的。在爆炸中合成的$ \ sim $ \,0.05 \, - \,0.10 m $ _ {\ odot} $,$ \ sim $ \,0.05 $ \ sim $ \,0.8 \, - \,1.9 \,$ \ times $ 10 $^{51} $ erg。

We report results of optical imaging and low-resolution spectroscopic monitoring of supernova (SN) 2017iro that occurred in the nearby ($\sim$\,31 Mpc) galaxy NGC 5480. The \ion{He}{1} 5876 Å\, feature present in the earliest spectrum (--\,7 d) classified it as a Type Ib SN. The follow-up observations span from --\,7 to +\,266 d with respect to the $B$-band maximum. With a peak absolute magnitude in $V$-band, ($M_{V}$)\,=\,$-17.76\pm0.15$ mag and bolometric luminosity (log$_{10}$\,L)\,=\,42.39\,$\pm$\, 0.09 erg s$^{-1}$, SN 2017iro is a moderately luminous Type Ib SN. The overall light curve evolution of SN 2017iro is similar to SN 2012au and SN 2009jf during the early (up to $\sim$100 d) and late phases ($>$150 d), respectively. The line velocities of both \ion{Fe}{2} 5169 Å\, and \ion{He}{1} 5876 Å\, are $\sim$\,9000 km s$^{-1}$ near the peak. The analysis of the nebular phase spectrum ($\sim$\,+209 d) indicates an oxygen mass of $\sim$\,0.35 M$_{\odot}$. The smaller [\ion{O}{1}]/[\ion{Ca}{2}] flux ratio of $\sim$\,1 favours a progenitor with a zero-age main-sequence mass in the range $\sim$\,13--15 M$_{\odot}$, most likely in a binary system, similar to the case of iPTF13bvn. The explosion parameters are estimated by applying different analytical models to the quasi-bolometric light curve of SN 2017iro. $^{56}$Ni mass synthesized in the explosion has a range of $\sim$\,0.05\,--\,0.10 M$_{\odot}$, the ejecta mass $\sim$1.4\,--\,4.3 M$_{\odot}$ and the kinetic energy $\sim$\,0.8\,--\,1.9\,$\times$ 10$^{51}$ erg.

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