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arXiv 1102.1164astro-ph.SR
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SN 2008 gz-很可能是正常类型IIP事件

SN 2008gz - most likely a normal type IIP event

Rupak Roy, Brijesh Kumar, Alexander S. Moskvitin, Stefano Benetti, Timur A. Fatkhullin, Brajesh Kumar, Kuntal Misra, Filomena Bufano, Ralph Martin, Vladimir V. … 展开作者

Rupak Roy, Brijesh Kumar, Alexander S. Moskvitin, Stefano Benetti, Timur A. Fatkhullin, Brajesh Kumar, Kuntal Misra, Filomena Bufano, Ralph Martin, Vladimir V. Sokolov, S. B. Pandey, H. C. Chandola, Ram Sagar

摘要:

我们目前的BV RI光度和低分辨率光谱调查的II型核心坍缩超新星(SN)2008 gz,发生在恒星形成臂和半光半径(太阳金属量区域)附近的螺旋星系NGC 3672。SN事件被发现较晚,对其光变曲线和光谱的详细研究表明,它是一个类似于原型SNe 2004 et和1999 em的IIP型事件。然而,与其他同类事件相比,SN 2008 gz在平台期到星云期的一个月内很少观察到V级下降1.5等。使用0.21 mag的Av作为下限,距离为25.5 Mpc,我们估计合成的$^{56}$ Ni质量为0.05 \pm 0.01 M*,中坪Mv为-16.6 \pm 0.2 mag。观察到的光球速度高于SN 2004 et在类似时期观察到的速度,表明爆炸能量相当于或高于SN 2004 et。H包线的膨胀速度也有类似的趋势。通过将其性质与其他研究充分的事件进行比较,以及使用最近对Dessart,Livne和Waldman(2010)的前SN模型的模拟,我们推断爆炸能量范围为2 - 3 × 10 $^{51}$ erg,再加上在爆炸后275天观察到的[O I] 6300-6364禁带谱线的宽度,给出了主-序列(非旋转,太阳金属丰度)的祖先质量为17 M*。我们在超新星爆发后近560天进行的窄带Hα观测以及在SN的多普勒校正谱中出现的零速度发射扭折表明,该事件发生在一个低光度恒星形成H II区。

英文摘要:

We present BV RI photometric and low-resolution spectroscopic investigation of a type II core-collapse supernova (SN) 2008gz, which occurred in a star forming arm and within a half-light radius (solar metallicity region) of a nearby spiral galaxy NGC 3672. The SN event was detected late and a detailed investigation of its light curves and spectra spanning 200 days suggest that it is an event of type IIP similar to archetypal SNe 2004et and 1999em. However, in contrast to other events of its class, the SN 2008gz exhibits rarely observed V magnitude drop of 1.5 over the period of a month during plateau to nebular phase. Using 0.21 mag of Av as a lower limit and a distance of 25.5 Mpc, we estimate synthesized $^{56}$Ni mass of 0.05 \pm 0.01 M* and a mid-plateau Mv of -16.6 \pm 0.2 mag. The photospheric velocity is observed to be higher than that was observed for SN 2004et at similar epochs, indicating explosion energy was comparable to or higher than SN 2004et. Similar trend was also seen for the expansion velocity of H-envelopes. By comparing its properties with other well studied events as well as by using a recent simulation of pre-SN models of Dessart, Livne & Waldman (2010), we infer an explosion energy range of 2 - 3 x 10$^{51}$ erg and this coupled with the observed width of the forbidden [O I] 6300-6364 Å line at 275 days after the explosion gives an upper limit for the main-sequence (non-rotating, solar metallicity) progenitor mass of 17 M*. Our narrow-band Hα observation, taken nearly 560 days after the explosion and the presence of an emission kink at zero velocity in the Doppler corrected spectra of SN indicate that the event took place in a low luminosity star forming H II region.

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