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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34 Citations (Scopus)

Abstract

We present deep 1.2mm photometry of 37 stars in the young (5Myr) Upper Scorpius OB association, sensitive to 4 × 10-3 M Jup 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 × 10-3 to 1.0 × 10-1M Jup. The source with the most massive disk exhibits a transition-disk spectral energy distribution. Combining our results with previous studies, we find that the millimeter-detection fraction of ClassII sources has significantly decreased from younger ages, and comparison with near-infrared and Hα measurements indicates that 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.

Original languageEnglish
Article number23
Number of pages10
JournalThe Astrophysical Journal
Volume745
Issue number1
DOIs
Publication statusPublished - 20 Jan 2012
Externally publishedYes

Keywords

  • circumstellar matter
  • open clusters and associations: individual (Upper Scorpius OB1)
  • protoplanetary disks
  • stars: pre-main sequence

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