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That light could come from colliding streams of star debris or from a gas cloud that absorbs and re-emits light from the disk.","posed_since":"2015","precise":"Optical and UV emission of TDEs is roughly blackbody with $T \\sim 2 \\times 10^{4} \\text{ to } 4 \\times 10^{4}\\,\\mathrm{K}$ and $\\mathrm{radius} \\sim 10^{14} \\text{ to } 10^{15}\\,\\mathrm{cm}$, much larger than the circularization radius. Determine whether it is powered by shocks where the debris stream intersects itself (Piran et al. 2015) or by reprocessing of accretion luminosity in an optically thick envelope or outflow, using light-curve shapes, line profiles and X-ray to optical ratios.","problem_ref":"9beb6eb7fb6fa8ac802cc54091f066ad425c654293c9e8e95a435733cde58992","references":"","settled_by":"Radiation hydrodynamics simulations of disruption, circularization and emission that reproduce observed temperatures, radii and line profiles for realistic black-hole masses.","status_note":"","title":"Shocks or reprocessed accretion as the source of TDE optical 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