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We report the discovery of a Tidal Disruption Event (TDE) candidate occurringin the Active Galactic Nucleus SDSS J022700.77-042020.6. A sudden increase influx of J0227-0420 during the second half of 2009 is clearly shown in thelong-term optical, UV, and NIR light curves. A plateau phase, following aninitial decline, is seen in the NUV and optical u, g, r, i light curves.Moreover, we find possible evidence that the plateau phase in the NUV band maylag behind the optical ones by approximately 70-80 days with also a muchshorter duration, i.e. $\sim$7-15 days against $\sim$40-50 days. The long-termNUV/optical (after the plateau phase), NIR and MIR light curves can be wellcharacterized with a form of $L(t)\propto t^{-\beta}$, consistent with theexpectation of a TDE. The plateaus can be explained if the stellar streamscollide with the pre-existing AGN disk at different radii. Though the overallfallback rate decreases, the material in the outer disk gradually drifts inwardand increases the local accretion rate at the inner region, producing theoptical and UV plateaus. The possible lag between the optical and NUV plateauscan then be attributed to viscosity delay. The index $\beta$ of the NIR $J, H,K_s$ bands ($\sim1.4-3.3$) is steeper than that of the UV/optical($\sim0.7-1.3$) and MIR bands ($\sim0.9-1.8$), which may suggest that a certainfraction of the dust in the inner region of the dusty torus may be sublimatedduring the TDE phase. Our results indicate that, due to collisions betweenstellar debris and pre-existing disk, the light curves of TDEs occurring in AGNmay show distinctive features, which may shed new light on the accretionprocess.

A Tidal Disruption Event Candidate Discovered in the Active Galactic Nucleus SDSS J022700.77-042020.6