Physics
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8157w&link_type=abstract
HST Proposal ID #8157
Physics
Hst Proposal Id #8157 Young Stars And Circumstellar Material
Scientific paper
We will probe the gaseous environments of low mass pre-main sequence stars by studying the H_2 UV Lyman bands. We have detected fluorescent H_2 Lyman band emission, pumped by H I Lyman Alpha and Si IV, in 8 classical T Tauri stars but not in 3 naked T Tauri stars. The former all show evidence for dusty circumstellar disks; the latter show no evidence for dust disks. In T Tau the H_2 emission is extended, but a large fraction of the total emission arises within 15 AU of the star. We propose 2 investigations: 1. Where is source of the fluoresced H_2 in the T Tauri stars? High dispersion spectra will yield the line profiles and velocities. Gas in inner disks should evidence orbital motions. At low dispersion, using a long slit, we can map the large-scale spatial distribution of the molecular gas. 2. What is the gas disk survival timescale? Do those PMS stars which show evidence of inner holes in their dust disks have evidence of gas disks? Do the gas and dust disks dissipate at the same time? The answers will have implications for theories of disk clearing and planetary formation, and will provide insights into the spatial distribution of gas near classical T Tauri stars.
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