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arXiv 2201.12534astro-ph.HE
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时变外流中的辐射扩散:快速蓝光学暂现源的一个模型

Radiative diffusion in a time-dependent outflow: a model for fast blue optical transients

Chun Chen, Rong-Feng Shen

AI总结:

针对无法用超新星爆发解释的快速蓝光学暂现源(FBOTs),提出时变外流中的辐射扩散模型,通过数值与解析计算模拟光子逃逸过程,成功拟合三个典型FBOTs的外流质量与喷射时间,推测其可能源于大质量恒星坍缩。

摘要:

快速蓝光学暂现源(FBOTs)是具有快速演化(通常 $t_{\rm rise}<12\\ \rm days$)光变曲线和蓝色(通常 $\rm {-0.2\\ >\\ g-r\\ >\\ -0.3}$)的高亮度暂现源,无法用类似超新星的爆发来解释。我们提出了一个时变外流中的辐射扩散模型来解释这类特殊的暂现源。在该模型中,我们假设中心引擎在几天内喷射连续外流。我们考虑外流的喷射是随时间变化的。外流最初是不透明的,光子被冻结在其中。随着外流随时间膨胀,光子逐渐逃逸,我们的工作就是模拟这种演化过程。分别考虑了数值计算和解析计算,结果是一致的。我们将该模型应用于三个典型的 FBOTs:PS1-10bjp、ZTF18abukavn 和 ATLAS19dqr。建模发现了它们外流的总质量($\sim 1-5 {M_{\odot}}$)和喷射的总时间($\sim$ 几天),这使我们推测它们可能是大质量恒星坍缩的结果。

英文摘要:

Fast Blue Optical Transients (FBOTs) are luminous transients with fast evolving (typically $t_{\rm rise}<12\ \rm days$) light curve and blue color (usually $\rm {-0.2\ >\ g-r\ >\ -0.3}$) that cannot be explained by a supernova-like explosion. We propose a radiative diffusion in a time-dependent outflow model to interpret such special transients. In this model, we assume a central engine ejects continuous outflow during a few days. We consider the ejection of the outflow to be time-dependent. The outflow is optically thick initially and photons are frozen in it. As the outflow expands over time, photons gradually escape, and our work is to model such an evolution. Numerical and analytical calculations are considered separately, and the results are consistent. We apply the model to three typical FBOTs: PS1-10bjp, ZTF18abukavn, and ATLAS19dqr. The modeling finds the total mass of the outflow ($\sim 1-5 {M_{\odot}}$), and the total time of the ejection ($\sim$ a few days) for them, leading us to speculate that they may be the result of the collapse of massive stars.

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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