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Paper: Signs for Heavy Bombardment in Debris Disks
Volume: 324, Debris Disks and the Formation of Planets: A Symposium in Memory of Fred Gillett
Page: 121
Authors: Dominik, C.; Bouwman, J.
Abstract: We explore the decay of the IR luminosity of debris disk with time as it was observed by observations with the ISO satellite. The observations show a steep decrease of the fractional luminosity, and after about 400 Myrs, the excess becomes undetectable for most stars. We describe a collisional model which predicts a slope of −1 in a collisionally dominated disk, and a slope of −2 in a radiation force dominated disk. Since debris disks are generally collisionally dominated, the observed slope of −1.7 is too large. Additional planetesimal removal processes are required. Finally we discuss the spectrum of the Herbig Ae star HD100546. This spectrum contains crystalline silicate emissions which are different from those seen in other similar stars. We speculate that this material may not have been thermally annealed as small grains, but may be the result of the destruction of differentiated bodies.
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