Paper:	HST/STIS Coronagraphic Imaging of Pre-Main Sequence Stars
Volume:	321, Extrasolar Planets: Today and Tomorrow
Page:	244
Authors:	Grady, C.A.
Abstract:	We present the results of a coronagraphic imaging survey of millimeter-selected classical T Tauri stars, and optically bright Herbig Ae stars. We find similar frequency of bipolar microjet detections, and similar evolutionary timescales for the optical brightness of disks exterior to 0.5" (50-70 AU at d=100-140 pc). We find an increasing fraction of stars with known large disks which are optically not detected beginning at ≈ 5 Myr. Many of these same stars have previously been identified as having substantial reservoirs of millimeter-sized grains, suggesting that we are detecting the decoupling of the dust from the gas, which is expected to be a necessary precursor for large-scale planetesimal formation.

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