arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2011.03068astro-ph.HEastro-ph.SR
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SN 2019 muj--一颗观测良好的Iax型超新星,弥补了该类超新星的光度差距

SN 2019muj -- a well-observed Type Iax supernova that bridges the luminosity gap of the class

Barnabás Barna, Tamás Szalai, Saurabh W. Jha, Yssavo Camacho-Neves, Lindsey Kwok, Ryan J. Foley, Charles D. Kilpatrick, David A. Coulter, Georgios Dimitriadis, … 展开作者

Barnabás Barna, Tamás Szalai, Saurabh W. Jha, Yssavo Camacho-Neves, Lindsey Kwok, Ryan J. Foley, Charles D. Kilpatrick, David A. Coulter, Georgios Dimitriadis, Armin Rest, Cesar Rojas-Bravo, Matthew R. Siebert, Peter J. Brown, Jamison Burke, Estefania Padilla Gonzalez, Daichi Hiramatsu, D. Andrew Howell, Curtis McCully, Craig Pellegrino, Matthew Dobson, Stephen J. Smartt, Jonathan J. Swift, Holland Stacey, Mohammed Rahman, David J. Sand, Jennifer Andrews, Samuel Wyatt, Eric Y. Hsiao, Joseph P. Anderson, Ting-Wan Chen, Massimo Della Valle, Lluís Galbany, Mariusz Gromadzki, Cosimo Inserra, Joe Lyman, Mark Magee, Kate Maguire, Tomás E. Müller-Bravo, Matt Nicholl, Shubham Srivastav, Steven C. Williams

摘要:

我们提出了SN 2019 muj(= ASASSN-19 tr)的早期($t < +50$天)观测,这是特殊SN Iax类中观测最好的成员之一。紫外和光学光度以及光学和近红外光谱跟踪从最大光照前5天的$\sim$开始($58707.8$ MJD上的$t_{max}(B)$),并涵盖光球阶段。早期的观测使我们能够估计喷出物的物理性质,并描述可能的分歧,从一个统一的化学丰度结构。估计的测辐射热光变曲线在1.05 $\times$ 10 $^{42}$ erg s $^{-1}$处达到峰值,并表明仅产生0.031 $M_\odot$的$^{56}$ Ni,使SN 2019 muj成为Iax类中等光度天体,峰值绝对星等为$M_{V}$ = -16.4等。估计爆炸日期为$t_0 = 58698.2$ MJD,意味着上升时间很短,为$t_{rise}$ = 9.6天在$B$ -乐队。我们通过合成光谱拟合光谱数据,通过辐射传输代码TARDIS计算。采用基于较亮SNe Iax的部分分层丰度模板提供了与SN 2019 muj的良好匹配。然而,如果没有早期的光谱,除了碳之外,大多数元素都不能说明分层的必要性,碳只允许出现在外层。SN 2019 muj提供了一个独特的机会,将极低光度的SNe Iax与经过充分研究的更明亮的SNe Iax联系起来。

英文摘要:

We present early-time ($t < +50$ days) observations of SN 2019muj (= ASASSN-19tr), one of the best-observed members of the peculiar SN Iax class. Ultraviolet and optical photometric and optical and near-infrared spectroscopic follow-up started from $\sim$5 days before maximum light ($t_{max}(B)$ on $58707.8$ MJD) and covers the photospheric phase. The early observations allow us to estimate the physical properties of the ejecta and characterize the possible divergence from a uniform chemical abundance structure. The estimated bolometric light curve peaks at 1.05 $\times$ 10$^{42}$ erg s$^{-1}$ and indicates that only 0.031 $M_\odot$ of $^{56}$Ni was produced, making SN 2019muj a moderate luminosity object in the Iax class with peak absolute magnitude of $M_{V}$ = -16.4 mag. The estimated date of explosion is $t_0 = 58698.2$ MJD and implies a short rise time of $t_{rise}$ = 9.6 days in $B$-band. We fit of the spectroscopic data by synthetic spectra, calculated via the radiative transfer code TARDIS. Adopting the partially stratified abundance template based on brighter SNe Iax provides a good match with SN 2019muj. However, without earlier spectra, the need for stratification cannot be stated in most of the elements, except carbon, which is allowed to appear in the outer layers only. SN 2019muj provides a unique opportunity to link extremely low-luminosity SNe Iax to well-studied, brighter SNe Iax.

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