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arXiv · 1111.0101

The Late Stages of Protoplanetary Disk Evolution: A Millimeter Survey of Upper Scorpius

Geoffrey S. Mathews·Jonathan P. Williams·Francois Ménard·Neil Phillips·Gaspard Duchêne·Christophe Pinte
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Abstract

We present deep 1.2 millimeter photometry of 37 stars in the young (5 Myr) Upper Scorpius OB association, sensitive to ~4 x 10^-3 Mjup of cool millimeter dust. Disks around four low- and solar-mass stars are detected, as well as one debris disk around an intermediate mass star, with dust masses ranging from 3.6 x 10^-3 -- 1.0 x 10^-1 Mjup. The source with the most massive disk exhibits a transition-disk spectral energy distribution. Combining our results with previous studies, we find the millimeter-detection fraction of Class II sources has significantly decreased from younger ages, and comparison with near-infrared and Halpha measurements indicates the present disks have undergone significant evolution in composition or structure at all radii. The disks of Upper Scorpius represent the tail-end of the depletion of primordial disks; while a few near-solar mass stars may still sustain giant planet formation, this process has finished around higher mass stars

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Geoffrey S. Mathews, Jonathan P. Williams, Francois Ménard, Neil Phillips, Gaspard Duchêne, Christophe Pinte. 2011-11-01. The Late Stages of Protoplanetary Disk Evolution: A Millimeter Survey of Upper Scorpius. https://doi.org/10.1088/0004-637x/745/1/23

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