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arXiv 1111.2509astro-ph.COastro-ph.SR
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II型超新星2006 V和2006 au:两个类似SN 1987 A的事件

The Type II supernovae 2006V and 2006au: two SN 1987A-like events

F. Taddia, M. D. Stritzinger, J. Sollerman, M. M. Phillips, J. P. Anderson, M. Ergon, G. Folatelli, C. Fransson, W. Freedman, M. Hamuy, N. Morrell, A. Pastorell… 展开作者

F. Taddia, M. D. Stritzinger, J. Sollerman, M. M. Phillips, J. P. Anderson, M. Ergon, G. Folatelli, C. Fransson, W. Freedman, M. Hamuy, N. Morrell, A. Pastorello, S. E. Persson, S. Gonzalez

摘要:

超新星1987 A揭示了一颗蓝超巨星(BSG)可以以核心坍缩超新星(SN)的形式结束生命。SN 1987 A和其他类似的天体表现出与普通II型高原(IIP)SNe不同的特性,后者的祖先被认为是红超巨星(RSG)。类似1987 A的事件之间的相似之处包括一个长时间的上升到最大值,早期的光度比正常的IIP型SNe要暗,放射性是光变曲线的主要来源。我们提出并分析了两个SNe监测的卡内基超新星项目,让人想起SN 1987 A。给出了SNe 2006 V和2006 Au的光学和近红外(NIR)光变曲线以及光谱。这些观测结果与SN 1987 A的观测结果进行了比较,并用于估计其祖先的属性。这两个天体都表现出缓慢上升到最大值的光变曲线演化与SN 1987 A相似。在最早的时期,SN 2006 au也显示出一个初始的下降,我们解释为绝热冷却阶段的标志,包围冲击爆发。SNe 2006 V和2006 au都比SN 1987 A更蓝、更热、更亮。SNe 2006 V和2006 au的光谱与SN 1987 A和其他正常的II型天体相似,尽管两者的膨胀速度都比SN 1987 A高。半解析模型拟合到每个物体的UVOIR光变曲线,由此估计祖细胞的物理性质。由此得到的两个SNe的喷出物质量估计约为20个太阳质量,爆炸能量为2 ~ 3 × 10^51尔格,其前身半径为75 ~ 100个太阳半径。SNe 2006 V和2006 au的前身星很可能是比SN 1987 A爆炸能量更大的BSG。

英文摘要:

Supernova 1987A revealed that a blue supergiant (BSG) star can end its life as a core-collapse supernova (SN). SN 1987A and other similar objects exhibit properties that distinguish them from ordinary Type II Plateau (IIP) SNe, whose progenitors are believed to be red supergiants (RSGs). Similarities among 1987A-like events include a long rise to maximum, early luminosity fainter than that of normal Type IIP SNe, and radioactivity acting as the primary source powering the light curves. We present and analyze two SNe monitored by the Carnegie Supernova Project that are reminiscent of SN 1987A. Optical and near-infrared (NIR) light curves, and optical spectroscopy of SNe 2006V and 2006au are presented. These observations are compared to those of SN 1987A, and are used to estimate properties of their progenitors. Both objects exhibit a slow rise to maximum and light curve evolution similar to that of SN 1987A. At the earliest epochs, SN 2006au also displays an initial dip which we interpret as the signature of the adiabatic cooling phase that ensues shock break- out. SNe 2006V and 2006au are both found to be bluer, hotter and brighter than SN 1987A. Spectra of SNe 2006V and 2006au are similar to those of SN 1987A and other normal Type II objects, although both consistently exhibit expansion velocities higher than SN 1987A. Semi-analytic models are fit to the UVOIR light curve of each object from which physical properties of the progenitors are estimated. This yields ejecta mass estimates of about 20 solar masses, explosion energies of 2 - 3 x 10^51 erg, and progenitor radii of 75 - 100 solar radii for both SNe. The progenitors of SNe 2006V and 2006au were most likely BSGs with a larger explosion energy as compared to that of SN 1987A.

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