A radiation-hydrodynamics model of T Tauri accretion shocks finds that the pre-shock accretion column absorbs about 70% of the post-shock radiation and forms a ~10^5 K radiative precursor, potentially explaining the UV/X-ray accretion-rate discrepancy.
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Effects of Radiation in Accretion Regions of Classical T Tauri Stars: Pre-heating of accretion column in non-LTE regime
A radiation-hydrodynamics model of T Tauri accretion shocks finds that the pre-shock accretion column absorbs about 70% of the post-shock radiation and forms a ~10^5 K radiative precursor, potentially explaining the UV/X-ray accretion-rate discrepancy.