MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063
MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063
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DOI：
10.3847/2041-8213/ac7390
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
Jiachen Jiang;N. Yasuda;K. Maeda;N. Tominaga;M. Doi;Ž. Ivezić;P. Yoachim;K. Uno;T. Moriya;B. Kumar;Yen-Chen Pan;Masayuki Tanaka;Masaomi Tanaka;K. Nomoto;S. Jha;P. Ruiz-Lapuente;David O. Jones;T. Shigeyama;N. Suzuki;M. Kokubo;H. Furusawa;S. Miyazaki;A. Connolly;D. Sahu;G. Anupama
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文献类型：
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作者：
Jiachen Jiang;N. Yasuda;K. Maeda;N. Tominaga;M. Doi;Ž. Ivezić;P. Yoachim;K. Uno;T. Moriya;B. Kumar;Yen-Chen Pan;Masayuki Tanaka;Masaomi Tanaka;K. Nomoto;S. Jha;P. Ruiz-Lapuente;David O. Jones;T. Shigeyama;N. Suzuki;M. Kokubo;H. Furusawa;S. Miyazaki;A. Connolly;D. Sahu;G. Anupama
在这封信中，我们报告了在静止帧紫外波段发现的一个超亮快速演化瞬变体MUSSES2020J。我们利用安装在8.2米斯巴鲁望远镜上的超大型主焦点相机（HSC），在该瞬变体出现后不久就发现了它。其上升时间约为5天，具有极高的紫外峰值光度，这与少数快速蓝色光学瞬变体有相似之处，这些瞬变体的峰值光度与最亮的超新星相当，但它们的时标要短得多（以下简称“快速蓝色超亮瞬变体”，FBUT）。此外，MUSSES2020J位于一个红移为1.063的正常低质量星系中心附近，这表明MUSSES2020J的能量源与宿主星系的中心部分可能存在联系。基于快速蓝色超亮瞬变体的首个多波段早期光变曲线，我们定性地讨论了为这种极端瞬变体提供能量的可能物理机制，如由风驱动的潮汐瓦解事件以及超新星与星周物质之间的相互作用，尽管这些情景能否定量解释MUSSES2020J的早期光度行为还需要系统的理论研究。由于这些极端瞬变体在紫外和蓝色光学波段具有超高光度，在不久的将来，通过深度广域光学巡天，有望发现从本地到高红移宇宙的大量快速蓝色超亮瞬变体。
In this Letter, we report the discovery of an ultraluminous fast-evolving transient in rest-frame UV wavelengths, MUSSES2020J, soon after its occurrence by using the Hyper Suprime-Cam (HSC) mounted on the 8.2 m Subaru telescope. The rise time of about 5 days with an extremely high UV peak luminosity shares similarities to a handful of fast blue optical transients whose peak luminosities are comparable with the most luminous supernovae while their timescales are significantly shorter (hereafter “fast blue ultraluminous transient,” FBUT). In addition, MUSSES2020J is located near the center of a normal low-mass galaxy at a redshift of 1.063, suggesting a possible connection between the energy source of MUSSES2020J and the central part of the host galaxy. Possible physical mechanisms powering this extreme transient such as a wind-driven tidal disruption event and an interaction between supernova and circumstellar material are qualitatively discussed based on the first multiband early-phase light curve of FBUTs, although whether the scenarios can quantitatively explain the early photometric behavior of MUSSES2020J requires systematical theoretical investigations. Thanks to the ultrahigh luminosity in UV and blue optical wavelengths of these extreme transients, a promising number of FBUTs from the local to the high-z universe can be discovered through deep wide-field optical surveys in the near future.