Physics
Scientific paper
Jul 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004hst..prop10221h&link_type=abstract
HST Proposal ID #10221
Physics
Hst Proposal Id #10221 Star Formation
Scientific paper
The FUV emission of CTTSs significantly impacts the chemical evolution and aids in the dispersal of gas in protoplanetary disks. Despite its importance, the dominant source of FUV emission, H I Ly-alpha at 1215.67 A, is not directly observable due to neutral hydrogen absorption in our line of sight to nearly all young stars. We have recently developed a novel technique to indirectly measure the Ly-alpha emission incident on the disk using Ly-alpha pumped molecular hydrogen emission lines, which are detected throughout the UV spectra of CTTSs. Measuring the Ly-alpha flux has a large effect of the total FUV emission from CTTSs: results from test cases demonstrate that at least 75% of the FUV emission is in this one line. The lack of accurate measurements of Ly-alpha remains a glaring weakness in chemical models of protoplanetary disks and disk dispersal. This strong emission will create a Ly-alpha dominated PDR-like disk surface at planet-forming radii close to the star. We propose using molecular hydrogen emission to reconstruct the intrinsic Ly-alpha line from three CTTSs to understand the dominant FUV emission source from these stars and its effect on protoplanetary disks.
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