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arXiv 2103.09166astro-ph.HE
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II型超新星2014 cx,2014 cy和2015 cz的光学性质

The optical properties of three type II supernovae: 2014cx, 2014cy and 2015cz

R. Dastidar, K. Misra, M. Singh, A. Pastorello, D. K. Sahu, X. Wang, A. Gangopadhyay, L. Tomasella, J. Zhang, S. Bose, J. Mo, N. Elias-Rosa, L. Tartaglia, S. Ya… 展开作者

R. Dastidar, K. Misra, M. Singh, A. Pastorello, D. K. Sahu, X. Wang, A. Gangopadhyay, L. Tomasella, J. Zhang, S. Bose, J. Mo, N. Elias-Rosa, L. Tartaglia, S. Yan, B. Kumar, G. C. Anupama, S. B. Pandey, L. Rui, T. Zhang, G. Terreran, P. Ochner, F. Huang

摘要:

我们给出了三个II型超新星2014 cx,2014 cy和2015 cz的光度和光谱分析。SN 2014 cx是一颗传统的IIP型,具有浅斜率(0.2 mag/50 d)和非典型的短平台($\sim$ 86 d)。SNe 2014 cy和2015 cz在稳定到平台相之前的早期表现出相对较大的下降率(分别为0.88和1.64 mag/50 d),这与典型的IIP/L SN型光变曲线不同。它们都是正常光度SN II,在中平台的绝对星等为M $_{V,14cx}^{50}$ = $-$ 16.6 $\pm$ 0.4 $\,\rm{mag}$,M $_{V,14cy}^{50}$ = $-$ 16.5 $\,\pm\,$ 0.2 $\,\rm{mag}$和M $_{V,15cz}^{50}$ = $-$ 17.4 $\,\pm\,$ 0.3 $\,\rm{mag}$。在这些爆炸中喷出的$^{56}$ Ni质量范围相对较宽(0.027-0.070 M $_\odot$)。的光谱显示了经典的II型超新星的演变,主要是由一个蓝色的连续与广泛的H线在早期阶段和较窄的金属线与P天鹅座的配置文件在高原。在SN 2014 cx的11600 km/s $^{-1}$的平台光谱中发现了高速H I特征,这可能是喷出物-拱星相互作用的标志。SN 2014 cy的光谱表现出类似于正常亮度事件的强H I吸收轮廓,而类似于次发光SNe的强金属线。对这三个事件的测辐射热光变曲线的分析建模得出三个物体在误差范围内的相似半径(SNe 2014 cx、2014 cy和2015 cz分别为478、507和608 R $_\odot$)和一系列喷出物质量(SNe 2014 cx、2014 cy和2015 cz的15.0、22.2和18.7 M $_\odot$),以及中等范围的爆炸能量(3.3 - 6.0 foe,其中1 foe = 10 $^{51}$ erg)。

英文摘要:

We present the photometric and spectroscopic analysis of three Type II SNe: 2014cx, 2014cy and 2015cz. SN 2014cx is a conventional Type IIP with a shallow slope (0.2 mag/50d) and an atypical short plateau ($\sim$86 d). SNe 2014cy and 2015cz show relatively large decline rates (0.88 and 1.64 mag/50d, respectively) at early times before settling to the plateau phase, unlike the canonical Type IIP/L SN light curves. All of them are normal luminosity SN II with an absolute magnitude at mid-plateau of M$_{V,14cx}^{50}$=$-$16.6$\pm$0.4$\,\rm{mag}$, M$_{V,14cy}^{50}$=$-$16.5$\,\pm\,$0.2$\,\rm{mag}$ and M$_{V,15cz}^{50}$=$-$17.4$\,\pm\,$0.3$\,\rm{mag}$. A relatively broad range of $^{56}$Ni masses is ejected in these explosions (0.027-0.070 M$_\odot$). The spectra show the classical evolution of Type II SNe, dominated by a blue continuum with broad H lines at early phases and narrower metal lines with P Cygni profiles during the plateau. High-velocity H I features are identified in the plateau spectra of SN 2014cx at 11600 km s$^{-1}$, possibly a sign of ejecta-circumstellar interaction. The spectra of SN 2014cy exhibit strong absorption profile of H I similar to normal luminosity events whereas strong metal lines akin to sub-luminous SNe. The analytical modelling of the bolometric light curve of the three events yields similar radii for the three objects within errors (478, 507 and 608 R$_\odot$ for SNe 2014cx, 2014cy and 2015cz, respectively) and a range of ejecta masses (15.0, 22.2 and 18.7 M$_\odot$ for SNe 2014cx, 2014cy and 2015cz), and a modest range of explosion energies (3.3 - 6.0 foe where 1 foe = 10$^{51}$ erg).

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