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CSS100217 was a nuclear, rapid and luminous flare in a Narrow-Line Seyfert 1galaxy, whose initial interpretation as a supernova is now debated betweenvariability of the active galactic nucleus (AGN) or a tidal disruption event(TDE). In this paper, we present and discuss new evidence in favour of a TDE orextreme flaring episode scenario. After the decay of the flare, the galaxyentered a long-term low luminosity state, 0.4 magnitudes lower than thepre-outburst emission in the V band. We attribute this to the creation of acavity in the accretion disk after the tidal disruption of a star in aretrograde orbit with respect to the accretion disk rotation, making a TDE ourfavoured interpretation of the flare. We also show how the host galaxy shows apoint-like, compact profile, no evidence for an extended component and arelatively low mass, unlike what expected from an AGN host galaxy at z=0.147. Acompact host galaxy may result in an increased TDE rate, strengthening ourinterpretation of the event.

The fall of CSS100217: a tidal disruption-induced low state in an apparently hostless active galactic nucleus