Pre-Main Sequence Stars in the Greater Taurus Ecosystem

Details Pre-Main Sequence Stars in the Greater Taurus Ecosystem Pre-Main Sequence Stars in the Greater Taurus Ecosystem

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50584p&link_type=abstract

Spitzer Proposal ID #50584

Computer Science

Scientific paper

Weak-line and post-T Tauri stars may represent an important evolutionary link in the story of planet formation. However, most lists of nearby WTTS are based on X-ray brightness and strong lithium absorption lines, indicators of youth which often cannot distinguish between pre-main sequence and Pleiades-age (100 Myr) stars. New optical surveys of the Taurus star-forming region have used the gravity-sensitive sodium lines to identify young pre-main sequence stars. Most of these objects lie outside the existing area of the Taurus Spitzer surveys. For the subset within our maps, 1/3 have excess within the Spitzer bands, validating this selection technique for young stars. We propose to obtain pointed Spitzer IRAC and MIPS photometry of these stars, which appear to form part of the 'Greater Taurus Ecosystem': an extended halo of youthful stars associated with, but outside, the star-forming molecular clouds. Our goals are to measure the frequency, fractional luminosity, and spatial distribution of disks within this extended young stellar population, and to identify rare transition disks among these post-T Tauri star candidates. The results will build a more complete picture of the late stages of disk evolution around low mass stars, and will be significant additions to the Spitzer science legacy for the Taurus region.

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