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

Di Wang

Published 2023-12-04Version 1

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