关于NGC 5806中SNHunt248的三重峰
On the triple peaks of SNHunt248 in NGC 5806
摘要：
我们提出了我们的研究结果的超新星（SN）冒名顶替者，SNHunt 248，基于光学和近红外数据跨越$\sim$ 15年前发现，$\sim$ 1年后发现。光变曲线显示三个不同的峰值，其中最明亮的是在$M_{R} \sim -15.0$马格。后发现的演变是一致的喷发物与两个不同地区的星周物质相互作用。在-740 d处的0.5 - 2.2 $μ$ m光谱能量分布与具有$\log(L/L_\odot) \sim 6.1$的单个6700 K黑体很好地匹配。这个温度和光度支持了先前关于黄色超巨星祖先的建议;然而，我们发现它比银河系中最明亮、质量最大的晚F到早G光谱型超巨星更亮。总的来说，历史光变曲线显示出高达$\sim \pm1$等的变化。在当前的时期（$\sim$爆发后1年），绝对星等（$M_{R} \sim -9$等）刚好低于发现前10年观测到的最微弱的历史绝对星等$\sim$。
英文摘要：
We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning $\sim$15 yrs before discovery, to $\sim$1 yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at $M_{R} \sim -15.0$ mag. The post-discovery evolution is consistent with the ejecta from the outburst interacting with two distinct regions of circumstellar material. The 0.5 - 2.2 $μ$m spectral energy distribution at -740 d is well-matched by a single 6700 K blackbody with $\log(L/L_\odot) \sim 6.1$. This temperature and luminosity support previous suggestions of a yellow hypergiant progenitor; however, we find it to be brighter than the brightest and most massive Galactic late-F to early-G spectral type hypergiants. Overall the historical light curve displays variability of up to $\sim \pm1$ mag. At current epochs ($\sim$1 yr post-outburst), the absolute magnitude ($M_{R} \sim -9$ mag) is just below the faintest observed historical absolute magnitude $\sim$10 yrs before discovery.
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