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Supermassive Binary Black Holes (SMBBHs) with sub-pc separations form in thecourse of galaxy mergers, if both galaxies harbour massive black holes. Clearobservational evidence for them however still eludes us. We propose a novelmethod of identifying these systems by means of reverberation mapping theircircumbinary disk after a tidal disruption event has ionized it. The tidaldisruption of a star at the secondary leads to strong asymmetries in the diskresponse. We model the shape of the velocity--delay maps for various toy diskmodels and more realistic gas distributions obtained by SPH simulations. Theemissivity of the ionized disk is calculated with {\em Cloudy}. We findpeculiar asymmetries in the maps for off center ionizing sources that may helpus constrain geometrical parameters of a circumbinary disk such as semi-majoraxis and orbital phase of the secondary, as well as help strengthen theobservational evidence for sub-parsec SMBBHs as such.

Tidal disruptions in circumbinary disks. II: Observational signatures in the reverberation spectra