Ultraviolet Detection of the Binary Companion to the Type IIb SN 2001ig
Ultraviolet Detection of the Binary Companion to the Type IIb SN 2001ig
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DOI：
10.3847/1538-4357/aaaf1e
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发表时间：
2018-01
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通讯作者：
S. Ryder;S. V. Dyk;O. Fox;E. Zapartas;S. D. Mink;N. Smith;E. Brunsden;K. Bostroem;A. Filippenko;I. Shivvers;WeiKang Zheng Aao;CaltechIPAC;Stsci;U. Amsterdam;S. Observatory;U. York;U. C. Davis;U. Berkeley
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作者：
S. Ryder;S. V. Dyk;O. Fox;E. Zapartas;S. D. Mink;N. Smith;E. Brunsden;K. Bostroem;A. Filippenko;I. Shivvers;WeiKang Zheng Aao;CaltechIPAC;Stsci;U. Amsterdam;S. Observatory;U. York;U. C. Davis;U. Berkeley
我们在14年前的IIb型SN 2001ig的F275W和F336W波段进行了HST/WFC3紫外成像。在爆炸地点发现了一个清晰的点源，mF275W = 25.39±0.10和mF336W = 25.88±0.13等。尽管与宿主星系NGC 7424的距离和对超新星的视线变红都有微弱的限制，但这个源符合早期b型主序星的特征，19,000 < Teff < 22,000 K和。BPASS v2.1双星演化模型的主星质量和次星质量分别为13 M⊙和9 M⊙，在赫茨普龙-罗素图中发现，这颗幸存的伴星的观测位置与其他IIb型超新星的主星演化终点同时相似。这个相同的模型显示出高度可变的后期质量损失，正如从射电光曲线的行为所预期的那样。6岁时的双子座/GMOS光谱显示出一条狭窄的He ii λ4686发射线，表明它与来自祖先的大半径的致密星周介质持续相互作用。我们回顾了在剥离包膜超新星双星演化通道背景下关于SN 2001ig的发现。由于其在紫外线中不拥挤的环境，这项对SN 2001ig的研究代表了迄今为止对IIb型超新星幸存的双星伴星最干净的探测之一。
We present HST/WFC3 ultraviolet imaging in the F275W and F336W bands of the Type IIb SN 2001ig at an age of more than 14 years. A clear point source is detected at the site of the explosion, with mF275W = 25.39 ± 0.10 and mF336W = 25.88 ± 0.13 mag. Despite weak constraints on both the distance to the host galaxy NGC 7424 and the line-of-sight reddening to the supernova, this source matches the characteristics of an early B-type main-sequence star with 19,000 < Teff < 22,000 K and . A BPASS v2.1 binary evolution model, with primary and secondary masses of 13 M⊙ and 9 M⊙, respectively, is found to simultaneously resemble, in the Hertzsprung–Russell diagram, both the observed location of this surviving companion, and the primary star evolutionary endpoints for other Type IIb supernovae. This same model exhibits highly variable late-stage mass loss, as expected from the behavior of the radio light curves. A Gemini/GMOS optical spectrum at an age of 6 years reveals a narrow He ii λ4686 emission line, indicative of continuing interaction with a dense circumstellar medium at large radii from the progenitor. We review our findings on SN 2001ig in the context of binary evolution channels for stripped-envelope supernovae. Owing to the uncrowded nature of its environment in the ultraviolet, this study of SN 2001ig represents one of the cleanest detections to date of a surviving binary companion to a Type IIb supernova.