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arXiv 1804.04641astro-ph.HE
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由K2/Kepler发现的快速演变的发光瞬态

A Fast-Evolving, Luminous Transient Discovered by K2/Kepler

A. Rest, P. M. Garnavich, D. Khatami, D. Kasen, B. E. Tucker, E. J. Shaya, R. P. Olling, R. Mushotzky, A. Zenteno, S. Margheim, G. Strampelli, D. James, R. C. S… 展开作者

A. Rest, P. M. Garnavich, D. Khatami, D. Kasen, B. E. Tucker, E. J. Shaya, R. P. Olling, R. Mushotzky, A. Zenteno, S. Margheim, G. Strampelli, D. James, R. C. Smith, F. Förster, V. A. Villar

摘要:

几十年来,光学时域搜索一直被用来寻找普通的超新星,这些超新星的亮度在几周内上升和下降。最近,超新星搜索已经改善了它们的节奏,并且已经确定了一些快速演变的发光瞬变(FELTs)。FELT的峰值亮度与Ia型超新星相当,但在$<10$天达到最大值,并在$<$月从视野中消失。在这里,我们提出了迄今为止这类最极端的例子,KSN 2015 K,上升时间只有2.2天,超过半最大值($t_{1/2}$)的时间只有6.8天。在这里,我们表明,与Ia型超新星不同,KSN 2015K的光变曲线不是由放射性元素的衰变提供动力的。我们进一步认为,它不太可能是由中央遗迹(磁星或黑洞)持续的能量沉积提供动力的。使用数值辐射流体动力学模型,我们表明,KSN 2015 K的光变曲线是很好的拟合模型,其中超新星运行到外部物质推测驱逐在前超新星质量损失插曲。因此,KSN 2015 K的快速上升探测了当高超音速冲击波从致密的扩展介质中爆发时光子的排出。

英文摘要:

For decades optical time-domain searches have been tuned to find ordinary supernovae, which rise and fall in brightness over a period of weeks. Recently, supernova searches have improved their cadences and a handful of fast-evolving luminous transients (FELTs) have been identified. FELTs have peak luminosities comparable to Type Ia supernovae, but rise to maximum in $<10$ days and fade from view in $<$month. Here we present the most extreme example of this class thus far, KSN2015K, with a rise time of only 2.2 days and a time above half-maximum ($t_{1/2}$) of only 6.8 days. Here we show that, unlike Type Ia supernovae, the light curve of KSN2015K was not powered by the decay of radioactive elements. We further argue that it is unlikely that it was powered by continuing energy deposition from a central remnant (a magnetar or black hole). Using numerical radiation hydrodynamical models, we show that the light curve of KSN2015K is well fit by a model where the supernova runs into external material presumably expelled in a pre-supernova mass loss episode. The rapid rise of KSN2015K therefore probes the venting of photons when a hypersonic shock wave breaks out of a dense extended medium.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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