T Tauri Star Snapshot Survey II. Completing the CTTs Sample

Details T Tauri Star Snapshot Survey II. Completing the CTTs Sample T Tauri Star Snapshot Survey II. Completing the CTTs Sample

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8216s&link_type=abstract

HST Proposal ID #8216

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Hst Proposal Id #8216 Young Stars And Circumstellar Material

Scientific paper

Infrared and millimeter continuum photometry suggests that as many as 50 solar nebula from which our planetary system formed. However, high resolution, high dynamic range optical images currently exist for only a few dozen of the hundreds of nearby T Tauri stars that may harbor observable disks. Initial HST imaging with WFPC2 has shown that circumstellar disks are detectable as reflection nebulosities adjacent to the bright PSF of the central star. We propose a continuation of our R-band SNAPshot survey of T Tauri stars in the five nearest star-forming clouds. The expanded source list includes all nearby classical T Tauri stars with HAlpha equivalent widths greater than 100 Angstroms - a group of objects which theory suggests are actively accreting material from circumstellar disks. Our goals are to determine the frequency of disk detections, to measure the disk sizes and constrain their masses, to identify the nearly edge-on systems which are particularly favorable for studies of disk geometry, and to discover new disks undetectable using other techniques. In combination with our Cycle 7 program, the result will be a large, uniform image database on as many as 140 young stars likely to possess circumstellar disks. This database will be of fundamental importance to understanding the nature of planet-forming environments and their frequency in the galaxy.

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