AI 中文总结
研究潮汐瓦解事件中时间相关吸积盘的长期光变曲线，通过升级模型纳入新参数，测试发现f_w和μ分别影响不稳定发生时间及辐射压力不稳定情况，还将模型应用于不同下降幅度观测并探讨其在特殊TDEs中的潜在应用。
AI 中文摘要
时间相关吸积盘已被用于解释潮汐瓦解事件（TDEs）中观测到的光变曲线。辐射压力不稳定性被认为是影响吸积盘演化的重要因素。本文升级了Guo & Qiao的时间相关盘模型，纳入用于修正粘性的指数μ（应力张量∝p^μp^(1 - μ)_gas，其中p = p_gas + p_rad）和用于风强度的参数f_w。同时采用更现实的回落率注入盘中。系统测试新参数影响后发现，f_w影响不稳定发生时间，μ影响辐射压力不稳定的发生及变化幅度。当μ<0.4时，辐射压力不稳定从盘中完全消除，光变曲线稳定演化无大幅变化；当μ>0.4时，光变曲线会因不稳定出现振荡，或在不稳定发生时急剧下降并在后期演化中变平，主要发生在粘性参数α小或碰撞参数β小时。由于下降幅度可由μ调节，将这些‘衰减到平坦’的光变曲线应用于不同下降幅度的TDEs的光学/紫外观测。最后讨论了该模型在一些光变曲线显示振荡的特殊TDEs中的潜在应用。
英文摘要
The time-dependent accretion disk has been applied to explain the light curves observed in tidal disruption events (TDEs). Radiation pressure instability is expected to be an important factor that can shape the evolution of the accretion disk. In this paper, we upgrade the time-dependent disk model in Guo $\&$ Qiao by incorporating an index $μ$ (with the stress tensor $\propto p^μp^{1-μ}_{\rm{gas}}$, where $p=p_{\rm{gas}} + p_{\rm{rad}}$) for the modified viscosity, and a parameter $f_{\rm{w}}$ for the strength of the wind. Meanwhile, we adopt a more realistic fallback rate to inject into the disk. After systematically testing the effects of the newly incorporated parameters, we find that $f_{\rm{w}}$ can affect the time when the instability occurs, while $μ$ can influence the occurrence and variation magnitude of the radiation pressure instability. When $μ<0.4$, the radiation pressure instability is completely removed from the disk, and the light curves evolve stably without large-scale magnitude variation. When $μ>0.4$, the light curves can show oscillations caused by the instability, or drop steeply when the instability occurs and become flat in the late-time evolution, which mainly occurs when the viscous viscosity parameter $α$ is small or the impact parameter $β$ is small. Since the drop magnitude can be modulated by $μ$, we apply these `decay-to-flatten' light curves to some optical/UV observations in TDEs with different magnitudes of decline. Finally, we discuss the potential application of our model to some special TDEs that show oscillations in the light curves.
Comments20 pages, 13 figures; Submitted to ApJ
