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arXiv 1606.03074astro-ph.HEastro-ph.SR
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PTF12os和iPTF13bvn。来自NGC 5806中低质量祖星的两个剥离包层超新星

PTF12os and iPTF13bvn. Two stripped-envelope supernovae from low-mass progenitors in NGC 5806

C. Fremling, J. Sollerman, F. Taddia, M. Ergon, M. Fraser, E. Karamehmetoglu, S. Valenti, A. Jerkstrand, I. Arcavi, F. Bufano, N. Elias Rosa, A. V. Filippenko, … 展开作者

C. Fremling, J. Sollerman, F. Taddia, M. Ergon, M. Fraser, E. Karamehmetoglu, S. Valenti, A. Jerkstrand, I. Arcavi, F. Bufano, N. Elias Rosa, A. V. Filippenko, D. Fox, A. Gal-Yam, D. A. Howell, R. Kotak, P. Mazzali, D. Milisavljevic, P. E. Nugent, A. Nyholm, E. Pian, S. Smartt

摘要:

本文研究了PTF在NGC 5806星系中发现的两颗剥层超新星。这些SNe,命名为PTF 12 os/SN 2012 P和iPTF 13 bvn,在距离主星系中心相似的距离爆炸。根据我们的光谱序列,我们将PTF 12 os归类为IIb型SN; iPTF 13 bvn先前已被归类为Ib型,可能有一个零年龄主序列(ZAMS)质量低于17太阳质量的祖先。我们的主要目标是限制iPTF 12 os和iPTF 13 bvn的爆炸参数,并对SN祖细胞施加约束。我们在SNe上展示了全面的数据集,并介绍了iPTF目前使用的一种新的参考减法管道(FPipe)。我们进行了详细的研究的光变曲线(LC)和光谱演化的SNe。使用流体动力学代码HYDE的测热LC建模。我们使用星云模型和后期光谱来约束祖细胞的ZAMS质量。我们进行图像注册的PTF 12 os的地面图像存档的NGC 5806的HST图像,以确定一个潜在的祖先候选人。我们的iPTF 13 bvn星云光谱表明,其前身的ZAMS质量较低,约为12个太阳质量。PTF 12 os的晚期光谱与ZAMS质量约为15个太阳质量一致。我们成功地确定了一个祖先的候选人PTF 12 os使用档案HST图像。这个来源与大质量恒星的星团是一致的。我们的流体动力学模型表明,PTF 12 os的祖先有一个紧凑的He核心,质量为3.25太阳质量,并合成了0.063太阳质量的强烈混合56 Ni。与IIb型SN 2011 dh的光谱比较表明,PTF 12 os的前身被质量低于0.02太阳质量的氢包层所包围。我们还发现了初步的证据,证明iPTF 13 bvn的祖先可能被少量的氢包围。

英文摘要:

We investigate two stripped-envelope supernovae (SNe) discovered in the nearby galaxy NGC 5806 by the (i)PTF. These SNe, designated PTF12os/SN 2012P and iPTF13bvn, exploded at a similar distance from the host-galaxy center. We classify PTF12os as a Type IIb SN based on our spectral sequence; iPTF13bvn has previously been classified as Type Ib having a likely progenitor with zero age main sequence (ZAMS) mass below ~17 solar masses. Our main objective is to constrain the explosion parameters of iPTF12os and iPTF13bvn, and to put constraints on the SN progenitors. We present comprehensive datasets on the SNe, and introduce a new reference-subtraction pipeline (FPipe) currently in use by the iPTF. We perform a detailed study of the light curves (LCs) and spectral evolution of the SNe. The bolometric LCs are modeled using the hydrodynamical code HYDE. We use nebular models and late-time spectra to constrain the ZAMS mass of the progenitors. We perform image registration of ground-based images of PTF12os to archival HST images of NGC 5806 to identify a potential progenitor candidate. Our nebular spectra of iPTF13bvn indicate a low ZAMS mass of ~12 solar masses for the progenitor. The late-time spectra of PTF12os are consistent with a ZAMS mass of ~15 solar masses. We successfully identify a progenitor candidate to PTF12os using archival HST images. This source is consistent with being a cluster of massive stars. Our hydrodynamical modeling suggests that the progenitor of PTF12os had a compact He core with a mass of 3.25 solar masses, and that 0.063 solar masses of strongly mixed 56Ni was synthesized. Spectral comparisons to the Type IIb SN 2011dh indicate that the progenitor of PTF12os was surrounded by a hydrogen envelope with a mass lower than 0.02 solar masses. We also find tentative evidence that the progenitor of iPTF13bvn could have been surrounded by a small amount of hydrogen.

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