Constraining the progenitor companion of the nearby Type Ia SN 2011fe with a nebular spectrum at +981 d
Constraining the progenitor companion of the nearby Type Ia SN 2011fe with a nebular spectrum at +981 d
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DOI：
10.1093/mnras/stv1888
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发表时间：
2015-01
影响因子：
4.8
通讯作者：
M. Graham;P. Nugent;M. Sullivan;A. Filippenko;S. Cenko;J. Silverman;K. Clubb;W. Zheng
中科院分区：
文献类型：
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作者：
M. Graham;P. Nugent;M. Sullivan;A. Filippenko;S. Cenko;J. Silverman;K. Clubb;W. Zheng
我们给出了附近Ia型超新星2011Fe的光学星云光谱，它是在爆炸后981d获得的。自+593d光谱以来，SN2011Fe几乎没有显示出演化，但在这个新的极晚的时间区域中有几个有趣的方面。我们认为？5800A特征的持续是由于Na？I.D，而？7300A的一个新的发射特征可能是[Ca？II]。此外，我们还讨论了？6400A的新发射特征可能是[Fe？i]，还是Mazzali等人预测的高速氢。星云特征在5200A呈现出至少+220到+980d每100d约350 km S 1的线速度演化，但线的形状也在这段时间内发生了变化，表明线的混合对演化有贡献。在爆炸后？1000d，来自SN的通量已经下降到可以检测到来自发光次级的贡献的点。在这项工作中，我们首次对碰撞后的残星进行了观测实验，并将其温度和光度限制在T？104K和L？104？L？此外，我们没有看到任何证据表明狭义H？我们光谱中的辐射。我们的结论是，观测结果继续强烈排除了SN 2011fe的许多单一简并情景。
We present an optical nebular spectrum of the nearby Type Ia supernova 2011fe, obtained 981 d after explosion. SN 2011fe exhibits little evolution since the +593 d optical spectrum, but there are several curious aspects in this new extremely late-time regime. We suggest that the persistence of the ?5800 A feature is due to Na?I D, and that a new emission feature at ?7300 A may be [Ca?II]. Also, we discuss whether the new emission feature at ?6400 A might be [Fe?I] or the high-velocity hydrogen predicted by Mazzali et al. The nebular feature at 5200 A exhibits a linear velocity evolution of ?350 km?s? 1 per 100 d from at least +220 to +980 d, but the line's shape also changes in this time, suggesting that line blending contributes to the evolution. At ?1000 d 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 ? 104?K?and?L?? 104?L?. Additionally, we do not see any evidence for narrow H ? emission in our spectrum. We conclude that observations continue to strongly exclude many single-degenerate scenarios for SN 2011fe.