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When a star passes through the tidal disruption radius of a massive blackhole (BH), it can be torn apart by the tidal force of the BH, known as theTidal Disruption Event (TDE). Since the UV/optical emitting region inferredfrom the blackbody radius is significantly larger than the circularizationradius predicted by the classical TDE theory, two competing models, streamcollision and envelope reprocessing, were proposed to explain the unexpectedlylarge UV/optical emitting size. Here, we investigate the variability behaviors(cross-correlation and time delay) of three representative TDEs with continuumreverberation mapping. Our results demonstrate that TDE behavior is clearlyinconsistent with the envelope reprocessing scenario. In contrast, the pictureof the stream collision, together with the late-time formed accretion disk, canexplain heterogeneous observations. This provides compelling evidence that theUV/optical emission originates from stream collisions during the early-stage ofTDE evolution and gradually transitions to being dominated by accretion diskwith detectable X-ray emission in a late stage. After fading back to aquiescent state, recurrent flares may be observed in some occasions, such aspartial TDEs.

Evidence for Stream Collision and Disk Formation in Tidal Disruption Events