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arXiv · 2610.38317

Numerical Simulations of the interaction between winds from tidal disruption event and supermassive black hole circumnuclear medium

De-Fu Bu·Yu-Heng Sheng·Liang Chen·Guo-Bin Mou·Hao-Jie Xia·Xiao-Hong Yang
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Abstract

The interaction between winds from tidal disruption event (TDE) and the circumnuclear medium (CNM) around supermassive black holes is believed to contribute to the radio emission of non-jetted TDEs. This model has been studied both analytically and numerically. In previous works, the properties of wind are usually set to be angle-independent. It is not clear to what extent the results deviate from those in the case where TDE wind properties are angle-dependent. We perform numerical simulations to investigate the effects of the angular distribution of wind properties on the radio light curve in the wind-CNM interaction model. We find that given that the wind mass and kinetic energy fixed, the radio light curve in the optically thin waveband significantly depends on the angle-dependence of wind properties. Even when the swept-up CNM mass is still less than the wind mass, a slight deceleration can affect the light curve. Changing the angular dependence of the wind properties causes the deceleration to vary across angles. Consequently, the final light curve--the time evolution of radiation integrated over all angles--would differ significantly from that predicted in models with a spatially uniform wind injection. This can result in a slower rise or a faster decline (depending on the CNM profile) than the analytical prediction, and can even turn the rise phase into a long-lasting plateau. Therefore, it is essential to carefully take into account the angular dependence of wind properties to study the wind-CNM interaction.

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De-Fu Bu, Yu-Heng Sheng, Liang Chen, Guo-Bin Mou, Hao-Jie Xia, Xiao-Hong Yang. 2026-10-28. Numerical Simulations of the interaction between winds from tidal disruption event and supermassive black hole circumnuclear medium. https://arxiv.org/abs/2610.38317

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