We propose multi-epoch spectropolarimetry for a nearby Optical/UV-bright Tidal Disruption Event (Optical/UV TDE) as ToO observations with FOCAS. Recently, the number of discoveries of Optical/UV TDEs has been increasing, thanks to new-generation optical surveys. Their observational properties are different from those of the classical X-ray-bright TDEs, which are powered by the accretion disk. Even though various models for the radiation mechanisms in Optical/UV TDEs have been proposed, observational constraints to differentiate the models are largely lacking. A key approach for more advanced and robust discussion for the radiation mechanism is polarimetry, especially spectropolarimetry. We propose here to carry out ToO spectropolarimetry of a TDE at multiple epochs before and after its brightness peak. Tracking the time evolution of polarization in detail, we are able to clarify the geometry and underlying physical processes that drive the light curve. Our main goals are (1) to identify the radiation process of the Optical/UV light curves and (2) to impose strong constraints on the origin of Optical/UV TDEs and their difference from the X-ray TDEs.
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