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arXiv 2107.09034astro-ph.HE
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利用星周物质相互作用特征探测Ia型超新星的前身星

Probing the Progenitors of Type Ia Supernovae using Circumstellar Material Interaction Signatures

Peter Clark, Kate Maguire, Mattia Bulla, Lluís Galbany, Mark Sullivan, Joseph P. Anderson, Stephen J. Smartt

摘要:

这项工作的目的是研究Ia型超新星祖先的不同探测器,这些探测器被认为与星周物质(CSM)的存在有关。特别是,我们已经调查,第一次,狭窄的蓝移NaID吸收曲线和广泛的高速CaII近红外三重吸收功能的存在和强度之间的联系在Ia型超新星周围的最大光。随着探测器探索超新星的不同距离; NaID > 10 $^{17}$ cm,高速CaII特征< 10 $^{15}$ cm。为此,我们使用了15颗Ia型超新星的新的中等分辨率X射线光谱样本。我们没有确定这两个探针之间的联系,这意味着,一个(或两个)是不物理相关的CSM的存在或CSM的发生在探测的距离由一个探针是不链接到它的存在,在探测的距离由其他。然而,先前确定的统计过剩的蓝移(超过红移)的NaID吸收的存在下,在这个样本中得到证实,在高的意义,并发现在晚型星系的Ia型超新星托管更强。这种过量很难解释为来自星际介质的起源,正如最近的一些模型所建议的那样,因为这样的起源预计不会显示出蓝移吸收的偏差。然而,这些功能的拱星起源也似乎不令人满意的基础上,我们的新结果,由于缺乏联系的两个探测器的CSM调查。

英文摘要:

This work aims to study different probes of Type Ia supernova progenitors that have been suggested to be linked to the presence of circumstellar material (CSM). In particular, we have investigated, for the first time, the link between narrow blueshifted NaID absorption profiles and the presence and strength of the broad high-velocity CaII near infrared triplet absorption features seen in Type Ia supernovae around maximum light. With the probes exploring different distances from the supernova; NaID > 10$^{17}$cm, high-velocity CaII features < 10$^{15}$cm. For this, we have used a new intermediate-resolution X-shooter spectral sample of 15 Type Ia supernovae. We do not identify a link between these two probes, implying either that, one (or both) is not physically related to the presence of CSM or that the occurrence of CSM at the distance explored by one probe is not linked to its presence at the distance probed by the other. However, the previously identified statistical excess in the presence of blueshifted (over redshifted) NaID absorption is confirmed in this sample at high significance and is found to be stronger in Type Ia supernovae hosted by late-type galaxies. This excess is difficult to explain as being from an interstellar-medium origin as has been suggested by some recent modelling, as such an origin is not expected to show a bias for blueshifted absorption. However, a circumstellar origin for these features also appears unsatisfactory based on our new results given the lack of link between the two probes of CSM investigated.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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