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We measure the temperature of warm gas at planet-forming radii in the disk around the classical T Tauri star (CTTS) TW Hya by modelling the H 2 fluorescence observed in HST /STIS and FUSE spectra. Strong Lyα emission irradiates a warm disk surface within 2 AU of the central star and pumps certain excited levels of H 2 . We simulate a 1D plane-parallel atmosphere to estimate fluxes for the 140 observed H 2 emission lines and to reconstruct the Lyα emission profile incident upon the warm H 2 . The excitation of H 2 can be determined from relative line strengths by measuring self-absorption in lines with low-energy lower levels,

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