SN 2019muj – a well-observed Type Iax supernova that bridges the luminosity gap of the class-猫眼课题宝

DOI：

10.1093/mnras/staa3543

发表时间：

2020-11

期刊：

Monthly Notices of the Royal Astronomical Society

影响因子：

4.8

通讯作者：

中科院分区：

物理与天体物理2区

文献类型：

作者：

B. Barna;T. Szalai;S. Jha;Y. Camacho-Neves;L. Kwok;R. Foley;C. Kilpatrick;D. Coulter;G. Dimitriadis;A. Rest;C. Rojas-Bravo;M. Siebert;P. Brown;J. Burke;Estefania Padilla Gonzalez-Estefania-Padilla Gonzalez-2126307194;D. Hiramatsu;D. Howell;C. McCully;C. Pellegrino;M. Dobson;S. Smartt;J. Swift;H. Stacey;Mohammed Rahman;D. Sand;J. Andrews;S. Wyatt;E. Hsiao;Joseph P. Anderson;Ting-Wan Chen;M. della Valle-M.-della Valle-2126308951;L. Galbany;M. Gromadzki;C. Inserra;J. Lyman;M. Magee;K. Maguire;T. Müller-Bravo;M. Nicholl;S. Srivastav;S. Williams

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。紫外线和光学光度测量以及光学和近红外光谱跟踪从最大光照（58707.8 $ MJD上的$t_{max}（B）$前5天开始，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。估计的热光变曲线在1.05 $\x $10 $^{42}$ erg $^{-1}$处达到峰值，并且表明仅产生了0.031 $M_\odot$的$^{56}$Ni，使SN 2019 muj成为Iax类中等光度天体，其峰值绝对星等为$M_{V}$ = -16.4等，估计爆发日期为t_0 = 16.4等在$B$波段，上升时间较短，为$t_{rise}$ = 9.6天。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。

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.

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

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