论文标题

卡内基超新星项目II。观察2014年发光的红色Nova

The Carnegie Supernova Project II. Observations of the luminous red nova AT 2014ej

论文作者

Stritzinger, M. D., Taddia, F., Fraser, M., Tauris, T. M., Contreras, C., Drybye, S, Galbany, L., Holmbo, S., Morrell, N., Pastorello, A., Phillips, M. M., Pignata, G., Tartaglia, L., Suntzeff, N. B., Anais, J., Ashall, C., Baron, E., Burns, C. R., Hoeflich, P., Hsiao, E. Y., Karamehmetoglu, E., Moriya, T. J., Bock, G., Campillay, A., Castellon, S., Inserra, C., Gonzalez, C., Marples, P., Parker, S., Reichart, D., Torres-Robledo, S., Young, D. R.

论文摘要

我们介绍了Carnegie Supernova Project-II的2014EJ的光学和近红外宽带光度法和光谱。这些观察结果与智利自动超新星搜索,瞬态对象的公共ESO光谱调查以及后院天文台超新星搜索相辅相成。 AT 2014EJ的观察性特征表明,它类似于被称为发光红色Novae(LRNE)的其他差距 - 频率亚类,包括无处不在的双驼峰光曲线和类似于LRN SN SN 2017JFS的光谱特性。 2014ej的中等散热,视觉波长频谱采取了麦哲伦粘土望远镜,表现出p Cygni h $α$特征,其特征是蓝色速度的特征,零强度为$ \ \ \ 110 $ \ s $ s $ s $ s $^{ - 1} $ and p cygni cygni the weemimim $ \ km $ km s $ km s $ km s $^s $^s s $^s s $^s s $^s s $^s s $^s s $^s s $^s s $^s s $^a从星际风中排放。检查前哈勃太空望远镜图像的检查不会产生结论性的祖细胞检测。与文献中的LRNE样本相比,2014EJ在亮度分布的较明亮端之一。比较文献中观察到的LRNE与公共 - 嵌入式演化模型的超紫,光学,红外(Uvoir)光曲线的比较,表明在所有阶段比较样本的光度下的模型下,也产生了第二次峰值的时间尺度。对LRNE建模的未来努力应扩展到当前探索的参数空间,因此可能考虑更大的系统和更广泛的动力学时间尺度。

We present optical and near-infrared broadband photometry and optical spectra of AT 2014ej from the the Carnegie Supernova Project-II. These observations are complemented with data from the CHilean Automatic Supernova sEarch, the Public ESO Spectroscopic Survey of Transient Objects, and from the Backyard Observatory Supernova Search. Observational signatures of AT 2014ej reveal that it is similar to other members of the gap-transient subclass known as luminous red novae (LRNe), including the ubiquitous double hump light curve and spectral properties akin to the LRN SN 2017jfs. A medium-dispersion, visual-wavelength spectrum of AT 2014ej taken the Magellan Clay telescope, exhibits a P Cygni H$α$ feature characterized by a blue velocity at zero intensity of $\approx 110$ km s$^{-1}$ and a P Cygni minimum velocity of $\approx70$ km s$^{-1}$, and which we attribute to emission from a circumstellar wind. Inspection of pre-outbust Hubble Space Telescope images yields no conclusive progenitor detection. In comparison with a sample of LRNe from the literature, AT 2014ej lies among the brighter end of the luminosity distribution. Comparison of the ultra-violet, optical, infrared (UVOIR) light curves of well-observed LRNe to common-envelope evolution models from the literature, indicates the models under predict the luminosity of the comparison sample at all phases and also produce inconsistent time-scales of the secondary peak. Future efforts to model LRNe should expand upon the current parameter space explored and therefore may consider more massive systems and a wider range of dynamical timescales.

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