Simulated optical light curves of super-Eddington tidal disruption events with ZEBRA flows
Simulated optical light curves of super-Eddington tidal disruption events with ZEBRA flows
复制标题
使用 ZEBRA 流模拟超级爱丁顿潮汐破坏事件的光学光曲线
DOI：
10.1093/mnras/stac3073
复制
发表时间：
2022
影响因子：
4.8
通讯作者：
Coughlin, Eric R.
中科院分区：
文献类型：
--
作者：
Eyles-Ferris, R. A. J.;Starling, R. L. C.;O’Brien, P. T.;Nixon, C. J.;Coughlin, Eric R.
我们提出了模拟的光学光变曲线的超爱丁顿潮汐破裂事件（TDEs）使用ZEro-BeRnoulli吸积（ZEBRA）流模型，提出在超爱丁顿阶段，光盘是准球形的，辐射压力为主，并伴随着强射流的生产。我们构造光变曲线上和离轴（相对于射流）观察员占喷射发射的各向异性性质。我们发现，在光学波长，从吸积流的发射是数量级的亮度比所产生的喷流，即使从同步加速器自康普顿升压。与观测到的TDE Swift J2058.4+0516相比，我们发现ZEBRA模型准确地捕获了吸积保持超爱丁顿的时间尺度，并再现了瞬态的光度。然而，我们发现光变曲线的形状在早期偏离，我们模拟的ZEBRA的半径和温度分别比观察到的小2.7-4.1倍和大1.4-2.3倍。我们认为，这表明ZEBRA膨胀更多，更快，比目前预测的模型，我们讨论了可能的扩展模型来解释这一点。这种改进，加上即将进行的大规模调查的宝贵新数据，可能有助于解决超级爱丁顿TDE的性质以及它们是如何供电的。
We present simulated optical light curves of super-Eddington tidal disruption events (TDEs) using the ZEro-BeRnoulli Accretion (ZEBRA) flow model, which proposes that during the super-Eddington phase, the disc is quasi-spherical, radiation-pressure dominated, and accompanied by the production of strong jets. We construct light curves for both on- and off-axis (with respect to the jet) observers to account for the anisotropic nature of the jetted emission. We find that at optical wavelengths, emission from the accretion flow is orders of magnitude brighter than that produced by the jet, even with boosting from synchrotron self-Compton. Comparing to the observed jetted TDE Swift J2058.4+0516, we find that the ZEBRA model accurately captures the time-scale for which accretion remains super-Eddington and reproduces the luminosity of the transient. However, we find the shape of the light curves deviate at early times and the radius and temperature of our modelled ZEBRA are ∼2.7–4.1 times smaller and ∼1.4–2.3 times larger, respectively, than observed. We suggest that this indicates the ZEBRA inflates more, and more rapidly, than currently predicted by the model, and we discuss possible extensions to the model to account for this. Such refinements, coupled with valuable new data from upcoming large-scale surveys, could help to resolve the nature of super-Eddington TDEs and how they are powered.