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We have investigated the spatial distribution, and the properties andchemical composition of the dust orbiting HD 100546. This system is remarkablydifferent from other isolated Herbig Ae/Be stars in both the strength of themid-IR excess and the composition of the circumstellar dust. We speculate thatthe formation and spatial distribution of the crystalline dust observed in theHD 100546 system may be linked to the formation of a proto-Jupiter in the diskaround HD 100546. Such a proto-Jupiter could gravitationally stir the diskleading to a collisional cascade of asteroidal sized objects producing smallcrystalline grains, or it could cause shocks by tidal interaction with the diskwhich might produce crystalline dust grains through flash heating. As shown byMalfait et al. (1998), the infrared spectrum of HD 100546 is very similar tothat of C/1995 O1 Hale-Bopp (Crovisier et al. 1997). Using an identicalmethodology, we have therefore also studied this solar system comet. Bothobjects have an almost identical grain composition, but with the importantdifference that the individual dust species in Hale-Bopp are in thermal contactwith each other, while this is not the case in HD 100546. This suggests that ifsimilar processes leading to the dust composition as seen in HD 100546 alsooccurred in our own solar system, that Hale-Bopp formed after the formation ofone or more proto-gas giants.Comment: 17 pages, 10 figures, Accepted for publication in Astronomy and  Astrophysic

The origin of crystalline silicates in the Herbig Be star HD 100546 and in comet Hale-Bopp