Evidence for Dust Grain Growth in Young Circumstellar Disks | Zendy

H. B. Throop | Zendy; John Bally | Zendy; L. W. Esposito | Zendy; M. J. McCaughrean | Zendy

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Evidence for Dust Grain Growth in Young Circumstellar Disks

Author(s) -

H. B. Throop,

John Bally,

L. W. Esposito,

M. J. McCaughrean

Publication year - 2001

Publication title -

science

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 12.556

H-Index - 1186

eISSN - 1095-9203

pISSN - 0036-8075

DOI - 10.1126/science.1059093

Subject(s) - circumstellar disk , circumstellar dust , physics , stars , astrophysics , planet , orion nebula , planetary system , formation and evolution of the solar system , grain growth , astrobiology , astronomy , planetary nebula , ultraviolet , cosmic dust , grain size , geology , optics , geomorphology

Hundreds of circumstellar disks in the Orion nebula are being rapidly destroyed by the intense ultraviolet radiation produced by nearby bright stars. These young, million-year-old disks may not survive long enough to form planetary systems. Nevertheless, the first stage of planet formation-the growth of dust grains into larger particles-may have begun in these systems. Observational evidence for these large particles in Orion's disks is presented. A model of grain evolution in externally irradiated protoplanetary disks is developed and predicts rapid particle size evolution and sharp outer disk boundaries. We discuss implications for the formation rates of planetary systems.

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