论文标题
SS Cygni中2021年异常事件的光曲线模拟
The light curve simulations of the 2021 anomalous event in SS Cygni
论文作者
论文摘要
原型矮nova SS Cyg意外地在2021年初的光曲线中表现出一个异常事件，其中常规矮人Nova型爆发停止了，但仅发生小振幅波动。受到此事件的启发，我们通过改变了凉爽磁盘中的传质速率和变化的粘度参数，对SS CYG的光曲线进行了数值模拟。我们还研究了在光曲线模拟中，气流溢出超出了外磁盘边缘的效果。我们已经证实，增强的传质不太可能导致2021年异常事件及其先驱。我们发现，磁盘中粘度的增强可能会重现该事件的先驱，但可能不足以解释2021年异常事件，尽管后者可能对我们使用的热平衡曲线特别。在我们的模拟中，与我们的标准模型相比，气流溢出的模型溢出的质量略高，可再现类似于2021异常事件的光曲线。我们建议，气流溢出对于复制该事件是必要的。气流溢出也可能导致SS CYG正常静止状态期间异常高的X射线通量。
The prototype dwarf nova SS Cyg unexpectedly exhibited an anomalous event in its light curve in the early few months of 2021 in which regular dwarf nova-type outbursts stopped, but small-amplitude fluctuations occurred only. Inspired by this event, we have performed numerical simulations of light curves of SS Cyg by varying mass transfer rates and varying viscosity parameters in the cool disk. We have also studied the effect of gas-stream overflows beyond the outer disk edge in the light curve simulations. We have confirmed that the enhanced mass transfer is unlikely responsible for the 2021 anomalous event and its forerunner. We have found that the enhancement of the viscosity in the disk may reproduce the forerunner of that event but may not be enough to explain the 2021 anomalous event, although the latter result might be particular to our thermal equilibrium curve used. Within our simulations, a model of the gas stream overflow with a slightly higher mass transfer rate than that of our standard model reproduces light curves similar to the 2021 anomalous event. We suggest that the gas-stream overflow is necessary to reproduce that event. The gas-stream overflow may also be responsible for the abnormally high X-ray flux during the normal quiescent state in SS Cyg.
