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Paper: Warm UV H2 Emission from the Inner Disks of CTTSs
Volume: 287, Galactic Star Formation Across the Stellar Mass Spectrum
Page: 307
Authors: Herczeg, G. J.; Linsky, J. L.; Wood, B. E.; Valenti, J. A.; Johns-Krull, C. M.
Abstract: We observed Lyman-band H2 emission in the 1150--1700 Åregion from the classical T Tauri stars TW Hya and DF Tau with HST/STIS using the E140M grating. In the UV spectra of TW Hya and DF Tau, we detect 146 and 94 H2 lines from 19 and 11 different upper levels, respectively, that are photoexcited by Lyα. The characteristics of the H2 emission indicate that it is produced in a warm layer within 2 AU of the central star. Models of this region indicate H2 excitation temperatures of about 2300 K. We present some implications of these results, including comparisons to photo-dissociation regions.
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