A submillimeter view of protoplanetary dust disks |
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Authors: | Sean M Andrews Jonathan P Williams |
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Institution: | (1) University of Hawaii Institute for Astronomy, Honolulu, HI 96822, USA |
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Abstract: | We present some results from our submillimeter single-dish and aperture synthesis imaging surveys of protoplanetary disks
using the JCMT, CSO, and Submillimeter Array (SMA) on Mauna Kea, Hawaii. Employing a simple disk model, we simultaneously
fit the spectral energy distributions and spatially resolved submillimeter continuum emission from our SMA survey to constrain
disk structure properties, including surface density profiles and sizes. The typical disk structure we infer is consistent
with a fiducial accretion disk model with a viscosity parameter α≈0.01. Combined with a large, multiwavelength single-dish survey of similar disks, we show how these observations provide
evidence for significant grain growth and rapid evolution in the outer regions of disks, perhaps due to an internal photoevaporation
process. In addition, we discuss SMA observations of the disks in the Orion Trapezium (proplyds) in the context of disk evolution
in a more extreme environment. |
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Keywords: | Stars: circumstellar matter Planetary systems: protoplanetary disks |
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