论文标题
h $α$ aTLAS18QTD的光度不在变形阶段
H$α$ Luminosity of ATLAS18qtd Does Not Plateau in the Nebular Phase
论文作者
论文摘要
我们提出了ATLAS18QTD/SN 2018CQJ的新光谱和光度观测，这是一种快速划分的IA Supernova，具有可变的H $α$发射，以前发布的Nebular相光谱。在最大光之后，在$ \ sim 540〜 \ rm d $中，ATLAS18QTD在光谱和光度观测中均未检测到，在最后H $α$检测后，$ \ sim 540〜 \ rm d $。有了这些新的非检测，我们对H $α$ luminosim的上限为$ \ Lessim 1.1 \ times 10^{36}〜\ rm {erg}〜\ rm s^{ - 1} $表示H $α$ Flux降低了$ \ gtrsim 4 $以来的$ \ gtrsim 4 $。该上限不包括自上一次检测以来高原或增加的H $α$排放，但无法确认H $α$α$排放衰减速率等于超新星衰减率。
We present new spectroscopic and photometric observations of ATLAS18qtd/SN 2018cqj, a fast-declining Type Ia supernova with variable H$α$ emission in previously-published nebular phase spectra. ATLAS18qtd is undetected in both spectroscopic and photometric observations which occurred at $\sim 540~\rm d$ after maximum light and $\sim 230~\rm d$ after the last H$α$ detection. With these new non-detections, we place an upper limit on the H$α$ luminosity of $\lesssim 1.1\times 10^{36}~\rm{erg}~\rm s^{-1}$ indicating the H$α$ flux decreased by a factor of $\gtrsim 4$ since the previous detection. This upper limit excludes H$α$ emission that plateaus or increases since the previous detection but cannot confirm that the H$α$ emission decay rate is equivalent to the supernova decay rate.
