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arXiv 1802.02252astro-ph.HE
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用超新星SN 2013 aa的极晚期光度学约束Ia型超新星的祖先方案

Constraining Type Ia Supernova Progenitor Scenarios with Extremely Late-time Photometry of Supernova SN 2013aa

Wynn V. Jacobson-Galan, Georgios Dimitriadis, Ryan J. Foley, Charles D. Kilpatrick

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14 pages, 5 figures, Accepted for publication in ApJ
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摘要：

我们提出了哈勃太空望远镜观测和光度测量Ia型超新星（SN Ia）SN 2013aa爆炸后1500天。在这个时期，光度主要由放射性${}^{57}\textrm{Co}$和${}^{55}\textrm{Fe}$的量决定，而在更早的时期，光度取决于放射性${}^{56}\textrm{Co}$的量。奇数和偶数同位素的比例在很大程度上取决于SN爆炸时祖先白矮星的密度，而这又取决于点火时祖先系统的细节。通过对SN 2013 aa的整个光变曲线的综合分析，我们测量到$0.02^{+0.01}_{-0.02}$的$M({}^{57}\textrm{Co})/M({}^{56}\textrm{Co})$比率，这表明在爆炸时，祖先白矮星的中心密度相对较低，与双简并祖先通道一致。我们估计了$M({}^{56}\textrm{Ni}) = 0.732 \pm 0.151\:\mathrm{M_{\odot}}$，并对${}^{55}\textrm{Fe}$的丰度设定了上限。最近的一项研究报告了$M({}^{57}\textrm{Co})/M({}^{56}\textrm{Co})$和四个Ia型SNe的拉伸之间可能的相关性。然而，SN 2013aa并不符合这一趋势，这表明SN 2013aa要么是一个极端的离群值，要么相关性在更大的样本中不成立。用测光法在极晚期测量的Ia超新星扩展样本的$M({}^{57}\textrm{Co})/M({}^{56}\textrm{Co})$的范围比爆炸模型的范围大得多，这可能限制了从极晚期测光法得出的关于Ia超新星祖先的结论。

英文摘要：

We present Hubble Space Telescope observations and photometric measurements of the Type Ia supernova (SN Ia) SN 2013aa 1500 days after explosion. At this epoch, the luminosity is primarily dictated by the amounts of radioactive ${}^{57}\textrm{Co}$ and ${}^{55}\textrm{Fe}$, while at earlier epochs, the luminosity depends on the amount of radioactive ${}^{56}\textrm{Co}$. The ratio of odd-numbered to even-numbered isotopes depends significantly on the density of the progenitor white dwarf during the SN explosion, which, in turn, depends on the details of the progenitor system at the time of ignition. From a comprehensive analysis of the entire light curve of SN 2013aa, we measure a $M({}^{57}\textrm{Co})/M({}^{56}\textrm{Co})$ ratio of $0.02^{+0.01}_{-0.02}$, which indicates a relatively low central density for the progenitor white dwarf at the time of explosion, consistent with double-degenerate progenitor channels. We estimate $M({}^{56}\textrm{Ni}) = 0.732 \pm 0.151\:\mathrm{M_{\odot}}$, and place an upper limit on the abundance of ${}^{55}\textrm{Fe}$. A recent study reported a possible correlation between $M({}^{57}\textrm{Co})/M({}^{56}\textrm{Co})$ and stretch for four SNe Ia. SN 2013aa, however, does not fit this trend, indicating either SN 2013aa is an extreme outlier or the correlation does not hold up with a larger sample. The $M({}^{57}\textrm{Co})/M({}^{56}\textrm{Co})$ measured for the expanded sample of SNe Ia with photometry at extremely late times has a much larger range than that of explosion models, perhaps limiting conclusions about SN Ia progenitors drawn from extremely late-time photometry.

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