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The detailed evolution of exoplanetary atmospheres has been the subject ofdecade-long studies. Only recently, investigations began on the possibleatmospheric mass loss caused by the activity of galactic central engines. Thisquestion has so far been explored without using available exoplanet data. Thegoal of this paper is to improve our knowledge of the erosion of exoplanetaryatmospheres through radiation from supermassive black holes (SMBHs) undergoingan active galactic nucleus (AGN) phase. To this end, we extended the well-knownenergy-limited mass-loss model to include the case of radiation from AGNs. Weset the fraction of incident power $\epsilon$ available to heat the atmosphereas either constant ($\epsilon = 0.1$) or flux dependent ($\epsilon =\epsilon(F_{\textrm{XUV}})$). We calculated the possible atmospheric mass lossfor 54 known exoplanets (of which 16 are hot Jupiters residing in the Galacticbulge and 38 are Earth-like planets (EPs)) due to radiation from the MilkyWay's (MW) central SMBH, Sagittarius A* (Sgr A*), and from a set of 107,220AGNs generated using the 33,350 AGNs at $z < 0.5$ of the Sloan Digital SkySurvey database. We found that planets in the Galactic bulge might have lost upto several Earth atmospheres in mass during the AGN phase of Sgr A*, while theEPs are at a safe distance from Sgr A* ($> 7$ kpc) and have not undergone anyatmospheric erosion in their lifetimes. We also found that the MW EPs mightexperience a mass loss up to $\sim 15$ times the Mars atmosphere over a periodof $50$ Myr as the result of exposure to the cumulative extreme-UV flux$F_{\textrm{XUV}}$ from the AGNs up to $z = 0.5$. In both cases we found thatan incorrect choice of $\epsilon$ can lead to significant mass lossoverestimates.

Comparative analysis of the influence of Sgr A* and nearby active galactic nuclei on the mass loss of known exoplanets