论文标题
部分潮汐破坏事件的回退率
Fallback Rates from Partial Tidal Disruption Events
论文作者
论文摘要
潮汐破坏事件（TDE）发生时，恒星通过超级质量的黑洞的潮汐半径坠落，这时恒星的自我重力被黑洞的潮汐重力淹没了。在部分TDE中，恒星未达到完全破坏的半径，只有一小部分恒星质量被潮湿剥离，而其余的则以幸存的核心的形式保持完整。分析论点最近提出，碎屑渐近渐近的时间缩放为部分干扰，有效地独立于完整核心的质量。我们提出流体动力学模拟，以验证该预测的存在，$ t^{ - 9/4} $缩放。我们还定义了一个休息时间尺度 - 后备率从$ t^{ - 5/3} $缩放到特征$ t^{ - 9/4} $缩放的时间 - 并测量此断裂时间尺度作为影响参数的函数和幸存的核心质量。这些结果加深了我们对TDE预期可能的后备曲线的特性和广度的理解，因此将有助于更准确地解释宽场调查的数据。
A tidal disruption event (TDE) occurs when a star plunges through a supermassive black hole's tidal radius, at which point the star's self-gravity is overwhelmed by the tidal gravity of the black hole. In a partial TDE, where the star does not reach the full disruption radius, only a fraction of the star's mass is tidally stripped while the rest remains intact in the form of a surviving core. Analytical arguments have recently suggested that the temporal scaling of the fallback rate of debris to the black hole asymptotes to $t^{-9/4}$ for partial disruptions, effectively independently of the mass of the intact core. We present hydrodynamical simulations that verify the existence of this predicted, $t^{-9/4}$ scaling. We also define a break timescale -- the time at which the fallback rate transitions from a $t^{-5/3}$ scaling to the characteristic $t^{-9/4}$ scaling -- and measure this break timescale as a function of the impact parameter and the surviving core mass. These results deepen our understanding of the properties and breadth of possible fallback curves expected from TDEs and will therefore facilitate more accurate interpretation of data from wide-field surveys.
