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arXiv 0912.0732astro-ph.SRastro-ph.CO
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SN 2008 ha早期和晚期观测:对前身星和爆发的附加约束

Early and Late-Time Observations of SN 2008ha: Additional Constraints for the Progenitor and Explosion

Ryan J. Foley, Peter J. Brown, Armin Rest, Peter J. Challis, Robert P. Kirshner, W. Michael Wood-Vasey

摘要:

本文给出了一个新的极低光度和极低能量Ia型超新星(SN Ia)2008 ha的最大光光谱,它比最早公布的光谱早一周获得。之前对SN 2008 ha的观测无法区分SN的大质量恒星和白矮星起源。新的最大光谱是在最早的光谱之前一周获得的,明确地显示了与中等质量元素相对应的特征,包括硅,硫和碳。虽然在一些核心塌陷SNe中可以看到强烈的硅特征,但作为碳/氧燃烧特征的硫特征在此类事件中总是被观察到较弱。因此SN 2008 ha很可能是碳氧白矮星的热核爆炸的结果。在最亮处的碳特征表明,未燃烧的物质存在于SN喷出物的显著深度,加强了SN 2008 ha是一次失败的爆燃的情况。我们还提出了与这种情况相一致的后期成像和光谱学。

英文摘要:

We present a new maximum-light optical spectrum of the the extremely low luminosity and exceptionally low energy Type Ia supernova (SN Ia) 2008ha, obtained one week before the earliest published spectrum. Previous observations of SN 2008ha were unable to distinguish between a massive star and white dwarf origin for the SN. The new maximum-light spectrum, obtained one week before the earliest previously published spectrum, unambiguously shows features corresponding to intermediate mass elements, including silicon, sulfur, and carbon. Although strong silicon features are seen in some core-collapse SNe, sulfur features, which are a signature of carbon/oxygen burning, have always been observed to be weak in such events. It is therefore likely that SN 2008ha was the result of a thermonuclear explosion of a carbon-oxygen white dwarf. Carbon features at maximum light show that unburned material is present to significant depths in the SN ejecta, strengthening the case that SN 2008ha was a failed deflagration. We also present late-time imaging and spectroscopy that are consistent with this scenario.

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