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arXiv 2201.06066astro-ph.HE
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SN 2012 ij:一颗低光度Ia型超新星和从类91 bg爆发到正常爆发连续分布的证据

SN 2012ij: A low-luminosity type Ia supernova and evidence for continuous distribution from 91bg-like explosion to normal ones

Zhitong Li, Tianmeng Zhang, Xiaofeng Wang, Hanna Sai, Jujia Zhang, Juncheng Chen, Xulin Zhao, Shengyu Yan, Bo Wang, Mark M. Phillips, Eric Y. Hsiao, Nidia Morre… 展开作者

Zhitong Li, Tianmeng Zhang, Xiaofeng Wang, Hanna Sai, Jujia Zhang, Juncheng Chen, Xulin Zhao, Shengyu Yan, Bo Wang, Mark M. Phillips, Eric Y. Hsiao, Nidia Morrell, Carlos Contreras, Christopher R. Burns, Christopher Ashall, Maximilian Stritzinger, Kevin Krisciunas, Jose Prieto, Hu Zou, Jiali Wang, Jun Ma, Jundan Nie, Suijian Xue, Xu Zhou, Zhimin Zhou, Danfeng Xiang, Gaobo Xi

摘要:

在本文中,我们介绍了一个亚发光Ia型超新星(SN Ia)2012 ij的光度和光谱观测,其具有绝对$B$ -带峰值幅度$M_{B,\rm{max}}$ = $-$ 17.95 $\pm$ 0.15 mag。$B$ -带光变曲线显示快速峰后下降,其中$Δm_{15}(B)$ = 1.86 $\pm$ 0.05 mag。所有的$R$和$I$ / $i$ -谱带光变曲线在峰后约3周显示出弱的次峰/肩特征,类似于Ia超新星的一些过渡子类,这可能是由于近红外(NIR)双峰的不完全合并。光谱具有Ti~{ \sc ii}和Si~{ \sc ii} $λ$ 5972的强吸收特征,这些特征在SN 1999 by等低光度天体中常见。最大光照前的近红外光谱显示出微弱的碳吸收特征,表明存在未燃烧物质。我们比较了SN 2012 ij的观测性质与亚克拉塞卡质量和克拉塞卡质量延迟爆轰模型预测的性质,发现这两个模型在一定程度上可以解释SN 2012 ij的光学和近红外光谱性质。通过比较$I$和$i$谱带的次峰特征,我们认为SN 2012 ij是连接正常Ia型超新星和典型类91 bg型超新星的过渡天体。根据已发表的来自$Carnegie~Supernova~Project~II$(CSP-II)的SNe Ia样本,我们估计SN 2012 ij样SNe Ia的分数不低于$\sim$ 2%。

英文摘要:

In this paper, we present photometric and spectroscopic observations of a subluminous type Ia supernova (SN Ia) 2012ij, which has an absolute $B$-band peak magnitude $M_{B,\rm{max}}$ = $-$17.95 $\pm$ 0.15 mag. The $B$-band light curve exhibits a fast post-peak decline with $Δm_{15}(B)$ = 1.86 $\pm$ 0.05 mag. All the $R$ and $I$/$i$-band light curves show a weak secondary peak/shoulder feature at about 3 weeks after the peak, like some transitional subclass of SNe Ia, which could result from an incomplete merger of near-infrared (NIR) double peaks. The spectra are characterized by Ti~{\sc ii} and strong Si~{\sc ii} $λ$5972 absorption features that are usually seen in low-luminosity objects like SN 1999by. The NIR spectrum before maximum light reveals weak carbon absorption features, implying the existence of unburned materials. We compare the observed properties of SN 2012ij with those predicted by the sub-Chandrasekhar-mass and the Chandrasekhar-mass delayed-detonation models, and find that both optical and NIR spectral properties can be explained to some extent by these two models. By comparing the secondary maximum features in $I$ and $i$ bands, we suggest that SN 2012ij is a transitional object linking normal SNe Ia to typical 91bg-like ones. From the published sample of SNe Ia from the $Carnegie~Supernova~Project~II$ (CSP-II), we estimate that the fraction of SN 2012ij-like SNe Ia is not lower than $\sim$ 2%.

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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