论文标题
光学/紫外线潮汐破坏事件的光学/紫外线发射的起源
The origin of the optical/ultraviolet emission of optical/ultraviolet tidal disruption events
论文作者
论文摘要
光学/紫外线（UV）潮汐破坏事件（TDES）的最突出的问题之一是其光学/UV发射的起源。已经提出，可以通过周围的光学较厚的信封或流出将恒星碎片磁盘产生的软X射线重新处理为光学/紫外光子。但是，此机制仍然没有详细的模型。在本文中，通过进行辐射转移的流体动力学模拟，我们计算了圆形恒星碎片吸收流/流出系统的光学/紫外线发射。我们发现，可以通过重新处理光学厚流出中积聚流的发射来生成光学/紫外线光子。该模型可以很好地解释光学/UV TDE的观察到的发射特性，包括发射半径，辐射温度和发光度以及这些数量随时间的演变，为理解光学/UV TDE的起源提供了强大的理论基础。
One of the most prominent problems of optical/ultraviolet (UV) tidal disruption events (TDEs) is the origin of their optical/UV emission. It has been proposed that the soft X-rays produced by the stellar debris accretion disk can be reprocessed into optical/UV photons by a surrounding optically thick envelope or outflow. However, there is still no detailed models for this mechanism. In this paper, by performing hydrodynamic simulations with radiative transfer, we calculate the optical/UV emission of the circularized stellar debris accretion flow/outflow system. We find that the optical/UV photons can be generated by reprocessing the emission of the accretion flow in the optically thick outflows. The model can well interpret the observed emission properties of optical/UV TDEs, including the emission radius, the radiation temperature and the luminosity, as well as the evolution of these quantities with time, providing a strong theoretical basis for understanding the origin of optical/UV TDEs.
