HST/STIS Coronagraphic Imaging of Pre-Main Sequence Stars

Details HST/STIS Coronagraphic Imaging of Pre-Main Sequence Stars HST/STIS Coronagraphic Imaging of Pre-Main Sequence Stars

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aspc..321..244g&link_type=abstract

Extrasolar Planets: Today and Tomorrow, ASP Conference Proceedings, Vol. 321, held 30 June - 4 July 2003, Institut D'Astrophysiq

Astronomy and Astrophysics

Astrophysics

Scientific paper

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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