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Recently, the reporter learned from the University of Science and Technology of China (hereinafter referred to as "USTC") that the research team of the university discovered the first spectrally certified and most conclusive repetitive partial black hole tidal disruption event (TDE), which is of great significance to the study of TDE population and physics. The relevant results were published in the international astronomical journal "The Astrophysical Journal Letters" on August 9, 2024.

A black hole tidal disruption event is a strong electromagnetic flare produced when an unlucky star is tidally torn apart and accreted by a massive black hole at the center of a galaxy. Interestingly, in recent years, several TDE candidates have been found to have re-erupted after several years, and they are considered to be candidates for repeating TDE events. However, these candidates lack other strong observational evidence other than light curves, and therefore have not been widely recognized by peers.

Based on the continuous discovery of TDE repetitive bursts, the research team composed of Jiang Ning, Wang Tinggui, Kong Xu and others from the Department of Astronomy of USTC began to pay attention to and regularly update the subsequent light curves of known TDEs, and finally discovered the re-burst of the black hole tidal disruption stellar event (TDE) event AT2022dbl, and quickly carried out multi-band follow-up observations. Based on the observational facts, the research team speculated that this "most unlucky" star may have been pulled out of the binary star system by the black hole, bound by the black hole in an elliptical orbit with a very high eccentricity, and was tidally torn and "sucked" multiple times when approaching the black hole.

Current research on optical TDEs has basically ignored repetitive partial-tearing TDE events. However, this study suggests that the probability of such events may not be low, and some conventional TDEs are actually partial-tearing events. Therefore, this study is of great significance for re-understanding the population statistics and physical processes of optical TDEs.

Hebao Science + Media Integration Studio

Hefei Tong Client - Hefei Daily All-Media Reporter: Liu Xiaorong

Source: Hefei Evening News