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X-ray quasi-periodic eruptions(QPEs) from galactic nucleus have been found inseveral galaxies. Among them, GSN 069 is the only one with a tidal disruptionevent(TDE), which was recently found to have brightened again 9 years after themain outburst.However, the origin of this TDE is still unclear. By comparingthe fallback time with observation, we found it can not be the disruption ofthe envelope of a single star in the tidal stripping model. Thus, we suggestthat it is a disruption of a common envelope(CE).By calculating the fallbackrate of such a model, we reproduce the second peak in the observational TDE. Ifthis model is true, this TDE will be the closest one to a direct observation ofCE.

TDE associated with the QPEs from GSN 069: disruption of a common envelope?