论文标题
SN 2020JFO：低质量祖先的短高原II型超新星
SN 2020jfo: A short plateau Type II supernova from a low mass progenitor
论文作者
论文摘要
我们在紫外线和光学波长中介绍了IIP超新星SN 2020JFO的光谱和光度观测。 SN 2020JFO发生在螺旋星系M61（NGC 4303）中，在过去的100年中观察到了八个超新星。 SN 2020JFO展示了一个短高原<65 d，并在$ m_v $ = -17.4 $ \ pm $ 0.4 mag的V波段中达到了最大的亮度，自爆炸以来，$ \ pm $ \ pm $ 0.5 d。从骨化光曲线中，我们估计爆炸中合成的$^{56} $ ni的质量为0.033 $ \ pm $ 0.006 $ m_ \ odot $。观察到的光谱特征对于IIP类型超新星来说是典型的，除了整个演化过程中的浅H $α$吸收以及稳定的$^{58} $ ni特征在Nebular阶段7378Å。估计使用Mesa + Stella框架中的流体动力学建模，估计射出质量为〜5 $ m_ \ odot $。模型还表明SN 2020JFO可能是带有$ M_ {ZAMS} $ 〜12 $ M_ \ ODOT $的红色超级巨型祖细胞的结果。降压光曲线建模揭示了初始〜20 d的二级辐射源的存在，这归因于与质量〜0.2 $ m_ \ odot $的质量材料的相互作用，由于超级新潮爆炸前约20年，很可能由于增强的质量损失而被弹出。
We present spectroscopic and photometric observations of the Type IIP supernova, SN 2020jfo, in ultraviolet and optical wavelengths. SN 2020jfo occurred in the spiral galaxy M61 (NGC 4303), with eight observed supernovae in the past 100 years. SN 2020jfo exhibited a short plateau lasting < 65 d, and achieved a maximum brightness in V-band of $M_V$ = -17.4 $\pm$ 0.4 mag at about 8.0 $\pm$ 0.5 d since explosion. From the bolometric light curve, we have estimated the mass of $^{56}$Ni synthesised in the explosion to be 0.033 $\pm$ 0.006 $M_\odot$. The observed spectral features are typical for a type IIP supernova except for shallow H$α$ absorption throughout the evolution and the presence of stable $^{58}$Ni feature at 7378 Å, in the nebular phase. Using hydrodynamical modelling in the MESA + STELLA framework, an ejecta mass of ~ 5 $M_\odot$ is estimated. Models also indicate SN 2020jfo could be the result of a Red Super Giant progenitor with $M_{ZAMS}$ ~ 12 $M_\odot$. Bolometric light curve modelling revealed the presence of a secondary radiation source for initial ~ 20 d, which has been attributed to interaction with a circumstellar material of mass ~ 0.2 $M_\odot$, which most likely was ejected due to enhanced mass loss about 20 years prior to the supernova explosion.
