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Paper: The Evolution of the Vega Phenomenon
Volume: 324, Debris Disks and the Formation of Planets: A Symposium in Memory of Fred Gillett
Page: 112
Authors: Silverstone, M.D.
Abstract: Using ISOPhot on ISO, almost 300 pre-main sequence and mainsequence stars, both in clusters and in isolated systems, were surveyed at 60μm and either 90 or 100μm to search for evidence of emission from orbiting dust. Over half the detections are new examples of dusty stellar systems. Such dust can be detected around numerous stars with ages from a few million though a billion years. Combining the data from these new systems with improved measurements for a number of IRAS-identified sources, and noisy measurements of systems too weak to be detected individually in this survey, typical excess luminosities relative to the stellar photospheres are derived for systems in selected age bins. The typical debris disk masses decline with stellar age (t), as t-2. This evolutionary behavior is consistent with a simple model for replenishment of secondary dust disks by collisions from a reservoir of large bodies.
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