On the triple peaks of SNHunt248 in NGC 5806
On the triple peaks of SNHunt248 in NGC 5806
复制标题
NGC 5806 中 SNHunt248 的三重峰
DOI：
10.1051/0004-6361/201526631
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发表时间：
2015
影响因子：
6.5
通讯作者：
L. Tomasella
中科院分区：
文献类型：
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作者：
E. Kankare;R. Kotak;A. Pastorello;M. Fraser;S. Mattila;S. Smartt;A. Bruce;K. Chambers;N. Elias;H. Flewelling;C. Fremling;J. Harmanen;M. Huber;A. Jerkstrand;T. Kangas;H. Kuncarayakti;M. Magee;E. Magnier;J. Polshaw;K. Smith;J. Sollerman;L. Tomasella
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类似于15年前发现，类似于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MR类似-15.0马格。后发现的演变是一致的喷出物从爆发相互作用的两个不同地区的星周物质。在-740天的0.5-2.2 μ m的光谱能量分布是很好地匹配了一个单一的6700 K黑体与日志（L/L-圆点）类似于6.1。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，历史光变曲线显示的变化高达类似于+/- 1等。在目前的时代（类似于爆发后1年），绝对星等（MR类似于-9等）略低于最微弱的观察到的历史绝对星等类似于发现前10年。
We present our findings on a supernova (SN) impostor, SNHunt248, based on optical and near-IR data spanning similar to 15 yr before discovery, to similar to 1 yr post-discovery. The light curve displays three distinct peaks, the brightest of which is at MR similar to -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 mu m spectral energy distribution at -740 d is well-matched by a single 6700 K blackbody with log(L/L-circle dot) similar to 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 similar to +/- 1 mag. At current epochs (similar to 1 yr post-outburst), the absolute magnitude (MR similar to -9 mag) is just below the faintest observed historical absolute magnitude similar to 10 yr before discovery.