On the detection of the progenitor of the type Ia supernova 2007on
On the detection of the progenitor of the type Ia supernova 2007on
复制标题
关于2007年Ia型超新星前身的探测
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
G. Nelemans
中科院分区：
文献类型：
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作者：
G. Roelofs;C. Bassa;R. Voss;G. Nelemans
我们提出了新的钱德拉X射线观测和详细的天体测量领域的Ia型超新星2007年，其中一个可能的祖先在钱德拉档案数据的检测最近报道。
在新的钱德拉图像中没有检测到光源，这是在光学最大值之后六周拍摄的。我们计算出超新星（SN）位置附近的任何X射线源比爆发前图像中的X射线源更暗的可能性为90- 99%，具体取决于孔径的选择，这支持了档案X射线源的识别。SN。
然而，对X射线和新光学图像的详细天体测量给出了SN和测量的X射线源位置之间的1.15 ± 0.27角秒的偏移。广泛的模拟表明，找到这种量级的偏移的概率是1.1%，等于（试验校正）与现场任何X射线源偶然对齐的概率。这对X射线源与原始X射线源的识别产生了怀疑，尽管根据所有可用数据，至少一些观察到的X射线与SN相连的情况可能是最不可能的。
在简要回顾了辅助证据之后，我们得出结论，只有未来的X射线观测才能进一步阐明X射线源和SN 2007上的祖先之间的联系，从而确定吸积白色矮星的情况是否真的有利于这个SN Ia。
We present new Chandra X-ray observations and detailed astrometry of the field of the type Ia supernova 2007on, for which the detection of a likely progenitor in archival Chandra data was recently reported.
No source is detected in the new Chandra images, taken six weeks after optical maximum. We calculate a 90–99 per cent probability that any X-ray source near the position of the supernova (SN) is fainter than in the pre-outburst images, depending on the choice of aperture, which supports the identification of the archival X-ray source with the SN.
Detailed astrometry of the X-ray and new optical images, however, gives an offset between the SN and the measured X-ray source position of 1.15 ± 0.27 arcsec. Extensive simulations show that the probability of finding an offset of this magnitude is ∼1 per cent, equal to the (trial-corrected) probability of a chance alignment with any X-ray source in the field. This casts doubt on the identification of the X-ray source with the progenitor, although the scenario in which at least some of the observed X-rays are connected to the SN may be the least unlikely based on all available data.
After a brief review of the auxiliary evidence, we conclude that only future X-ray observations can shed further light on the proposed connection between the X-ray source and the progenitor of SN 2007on, and thus whether an accreting white dwarf scenario is truly favoured for this SN Ia.