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arXiv 1502.00646astro-ph.SR
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用+981天的星云谱约束附近Ia型行星SN 2011 fe的祖先伴星

Constraining the Progenitor Companion of the Nearby Type Ia SN 2011fe with a Nebular Spectrum at +981 Days

Melissa L. Graham, Peter E. Nugent, Mark Sullivan, Alexei V. Filippenko, S. Bradley Cenko, Jeffrey M. Silverman, Kelsey I. Clubb, Weikang Zheng

摘要:

我们提出了一个光学星云光谱附近的Ia型超新星2011 fe,获得爆炸后981天。SN 2011 fe自+593天光谱以来几乎没有演化,但在这个新的极晚的时期有几个奇怪的方面。我们认为,持久性的$\sim5800$ ~ ψ功能是由于钠I D,和一个新的发射功能在$\sim7300$ ~ ψ可能是[Ca II]。此外,我们还讨论了在$\sim6400$ ~ 100的新的发射特征可能是[Fe I]还是由Mazzali等人预测的高速氢。在5200~ 100的星云特征表现出的$\sim350$ $\rm km\ s^{-1}$的线速度演化每100天从至少+220到+980天,但线的形状也改变了在这段时间,这表明线混合有助于演化。在爆炸后的$\sim 1000$天,SN的通量下降到可以检测到发光次级辐射贡献的程度。在这项工作中,我们进行了第一次观测测试后的影响残留的恒星,并限制其温度和光度的$T \gtrsim 10^4$ $\rm K$和$L \lesssim 10^4$ $\rm L_{\odot}$。此外,在我们的光谱中,我们没有看到任何窄H $α$发射的证据。我们的结论是,观测继续强烈排除SN 2011 fe的许多单简并情景。

英文摘要:

We present an optical nebular spectrum of the nearby Type Ia supernova 2011fe, obtained 981 days after explosion. SN 2011fe exhibits little evolution since the +593 day optical spectrum, but there are several curious aspects in this new extremely late-time regime. We suggest that the persistence of the $\sim5800$~Å feature is due to Na I D, and that a new emission feature at $\sim7300$~Å may be [Ca II]. Also, we discuss whether the new emission feature at $\sim6400$~Å might be [Fe I] or the high-velocity hydrogen predicted by Mazzali et al. The nebular feature at 5200~Å exhibits a linear velocity evolution of $\sim350$ $\rm km\ s^{-1}$ per 100 days from at least +220 to +980 days, but the line's shape also changes in this time, suggesting that line blending contributes to the evolution. At $\sim 1000$ days after explosion, flux from the SN has declined to a point where contribution from a luminous secondary could be detected. In this work we make the first observational tests for a post-impact remnant star and constrain its temperature and luminosity to $T \gtrsim 10^4$ $\rm K$ and $L \lesssim 10^4$ $\rm L_{\odot}$. Additionally, we do not see any evidence for narrow H$α$ emission in our spectrum. We conclude that observations continue to strongly exclude many single-degenerate scenarios for SN 2011fe.

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