Modeling continuum polarization levels of tidal disruption events based on the collision-induced outflow mode

TDEs have been observed in the optical and UV for more than a decade but the underlying emission mechanism still remains a puzzle. It has been suggested that viewing angle effects could potentially explain their large photometric and spectroscopic diversity. Polarization is indeed sensitive to the viewing angle and the first polarimetry studies of TDEs are now available, calling for a theoretical interpretation. In this study, we model the continuum polarization levels of TDEs using the radiative transfer code POSSIS and the collision-induced outflow (CIO) TDE emission scenario where unbound shocked gas originating from a debris stream intersection point offset from the black hole, reprocesses the hard emission from the accretion flow into UV and optical bands. We explore two different cases of peak mass fallback rates M'p (~3 and ~0.3 Msol/yr) while varying the following geometrical parameters: the distance R_int from the black hole (BH) to the intersection point, the radius of the photosphere around the BH R_ph, on the surface of which the photons are generated, and the opening angle Deltheta (anisotropic emission). For the high mass fallback rate case, we find for every viewing angle polarization levels below one (P