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GRB 161219 B- SN 2016 jca:一个强大的恒星坍缩

GRB 161219B-SN 2016jca: a powerful stellar collapse

C. Ashall, P. A. Mazzali, E. Pian, S. E. Woosley, E. Palazzi, S. J. Prentice, S. Kobayashi, S. Holmbo, A. Levan, D. Perley, M. D. Stritzinger, F. Bufano, A. V. … 展开作者

C. Ashall, P. A. Mazzali, E. Pian, S. E. Woosley, E. Palazzi, S. J. Prentice, S. Kobayashi, S. Holmbo, A. Levan, D. Perley, M. D. Stritzinger, F. Bufano, A. V. Filippenko, A. Melandri, S. Oates, A. Rossi, J. Selsing, W. Zheng, A. J. Castro-Tirado, G. Chincarini, P. D'Avanzo, M. De Pasquale, S. Emery, A. S. Fruchter, K. Hurley, P. Moller, K. Nomoto, M. Tanaka, A. F. Valeev

摘要:

我们报告了对附近的伽马射线暴GRB 161219 B(红移$z=0.1475$)和相关的Ic型超新星(SN)2016 jca的观测和分析。GRB 1,161219 B具有各向同性的伽马射线能量$\sim 1.6 \times 10^{50}$ 1,erg。它的余辉很可能在第一个光度点(0.6\,d)之前的一个时期被刷新,这减缓了衰减速率。综合分析的SN光变曲线和多波长观测的余辉表明,伽玛暴喷流是广泛的余辉阶段(全张开角$\sim 42^\circ \pm 3^\circ$)。我们的光谱系列显示了GRB超新星(SNe)典型的宽吸收线,这证明了速度高达$\sim 0.25$ c的物质的存在。3.73 μ d处的光谱允许非常早地识别与GRB有关的SN。再现它需要一个大的光球速度($35,000 \pm 7000$ \,\kms)。通过模型估计SN的动能为\KE $\approx 4 \times 10^{52}$,erg为球对称。在爆炸中喷出的质量是\Mej $\approx 6.5 \pm 1.5$ \,\Msun,远小于其他GRB-SNe,表明这些事件之间的多样性。爆炸中的\Nifs \总量为$0.27 \pm 0.05$ \,\Msun。观察到的光谱需要新鲜合成的\Nifs \以最高速度存在,至少是标准GRB-SN的3倍。我们还发现了\Nifs \丰度随速度降低而降低的证据。这表明SN\,2016 jca是一个高度非球面的爆炸,靠近轴,由一个紧凑的残余物提供动力。应用典型的不对称修正,SN 1,2016 jca的能量为$\sim$(1- 3)$\times 10^{52}$ 1,erg,证实GRB-SN e产生的大部分能量进入SN喷出物的动能。

英文摘要:

We report observations and analysis of the nearby gamma-ray burst GRB\,161219B (redshift $z=0.1475$) and the associated Type Ic supernova (SN) 2016jca. GRB\,161219B had an isotropic gamma-ray energy of $\sim 1.6 \times 10^{50}$\,erg. Its afterglow is likely refreshed at an epoch preceding the first photometric points (0.6\,d), which slows down the decay rates. Combined analysis of the SN light curve and multiwavelength observations of the afterglow suggest that the GRB jet was broad during the afterglow phase (full opening angle $\sim 42^\circ \pm 3^\circ$). Our spectral series shows broad absorption lines typical of GRB supernovae (SNe), which testify to the presence of material with velocities up to $\sim 0.25$c. The spectrum at 3.73\,d allows for the very early identification of a SN associated with a GRB. Reproducing it requires a large photospheric velocity ($35,000 \pm 7000$\,\kms). The kinetic energy of the SN is estimated through models to be \KE $\approx 4 \times 10^{52}$\,erg in spherical symmetry. The ejected mass in the explosion was \Mej $\approx 6.5 \pm 1.5$\,\Msun, much less than that of other GRB-SNe, demonstrating diversity among these events. The total amount of \Nifs\ in the explosion was $0.27 \pm 0.05$\,\Msun. The observed spectra require the presence of freshly synthesised \Nifs\ at the highest velocities, at least 3 times more than a standard GRB-SN. We also find evidence for a decreasing \Nifs\ abundance as a function of decreasing velocity. This suggests that SN\,2016jca was a highly aspherical explosion viewed close to on-axis, powered by a compact remnant. Applying a typical correction for asymmetry, the energy of SN\,2016jca was $\sim$ (1--3) $\times 10^{52}$\,erg, confirming that most of the energy produced by GRB-SNe goes into the kinetic energy of the SN ejecta.

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