Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9136g&link_type=abstract
HST Proposal ID #9136
Computer Science
Hst Proposal Id #9136 Star Formation
Scientific paper
Millimeter and IR studies suggest at least 50 percent of pre-main sequence solar-mass stars, the T Tauri stars, have circumstellar disks similar to the disk from which our planetary system formed. High spatial resolution, high dynamic range imaging of such systems maps the spatial distribution of material around the star, constraining the disk sizes and inclinations, and provides a first assessement of when structure in the disk, such as cleared central zones and annuli, which has been linked to planet formation, develops. HST coronographic studies have probed circumstellar material around older solar-mass stars {NICMOS}, and intermediate-mass stars {STIS}. WFPC2 direct optical imaging has revealed the disks only for 10 percent of T Tauri stars with firm millimeter detections, with the detections more common among the younger { 10^4-10^5 yr}, heavily embedded objects. Understanding the nature of planet formation requires comparable coverage of disks around solar- mass stars with ages of a few Myr. We propose filling this gap in the current survey coverage with STIS broadband, optical, coronagraphic imaging of a sample of 1-3 Myr old T Tauri stars. Our program stars have firm indications of disks from the millimeter, but require deeper optical imaging such as can only be provided by STIS.
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