Radiative hydrodynamical simulations of super-Eddington accretion flow in tidal disruption event: the origin of optical/UV emission

Author:

Bu De-Fu1,Qiao Erlin23,Yang Xiao-Hong4,Liu Jifeng23,Chen Zhiwei23,Wu Yongxin23

Affiliation:

1. Shanghai Astronomical Observatory, Chinese Academy of Sciences , 80 Nandan Road, Shanghai 200030, China

2. Key Laboratory of Space Astronomy and Technology, National Astronomical Observatory, Chinese Academy of Sciences , Beijing 100012, China

3. School of Astronomy and Space Sciences, University of Chinese Academy of Sciences , 19A Yuquan Road, Beijing 100049, China

4. Department of Physics, Chongqing University , Chongqing 400044, China

Abstract

ABSTRACT 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 disc 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 blackbody luminosity, as well as the evolution of these quantities with time, providing a strong theoretical basis for understanding the origin of optical/UV TDEs.

Funder

Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 5 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Detectability of Strongly Gravitationally Lensed Tidal Disruption Events;The Astrophysical Journal;2024-02-01

2. Radiative hydrodynamical simulations of super-Eddington accretion flow in tidal disruption event: the accretion flow and wind;Monthly Notices of the Royal Astronomical Society;2023-06-07

3. Radio emission of tidal disruption events from wind–cloud interaction;Monthly Notices of the Royal Astronomical Society;2023-03-17

4. Extreme accretion events: TDEs and changing‐look AGN;Astronomische Nachrichten;2023-02-06

5. Cooling Envelope Model for Tidal Disruption Events;The Astrophysical Journal Letters;2022-09-01

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