Resolving Molecular Hydrogen Disks Around T Tauri Stars

Details Resolving Molecular Hydrogen Disks Around T Tauri Stars Resolving Molecular Hydrogen Disks Around T Tauri Stars

Jul 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9093j&link_type=abstract

HST Proposal ID #9093

Physics

Hst Proposal Id #9093 Star Formation

Scientific paper

Molecular hydrogen is believed to be the dominant constituent of circumstellar disks at radii 0.1 - 5 AU around young stars. Fluoresced UV lines pumped by Ly-Alpha are bright and offer a valuable probe of H_2 in disks around young stars, with the ultimate goal being the ability to study the structure and evolution of the planet forming regions around these stars. The limited H_2 data now available for T Tauri stars {TTS} are inadequate to isolate the location of molecular hydrogen emission, though the current data suggests emission from 2 AU in the disk around DF Tau. We will use deep, high resolution {E140H} STIS-FUV spectra to resolve the distinctive spectral line signature of Keplerian rotation in disks around two nearly edge on TTS. These will be the first high resolution UV spectra of any TTS and will provide the radius in the disk at which molecular hydrogen can survive. This in turn indicates the inner boundary of the ``dead zone" in TTS accretion disks which is the likely location for the formation of planets.

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