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• W2129668049 abstract "Silicate dust grains in the interstellar medium are known to be mostly amorphous, yet crystalline silicate grains have been observed in many long-period comets and in protoplanetary disks. Annealing of amorphous silicate grains into crystalline grains requires temperatures of ≳1000 K, but exposure of dust grains in comets to such high temperatures is incompatible with the generally low temperatures experienced by comets. This has led to the proposal of models in which dust grains were thermally processed near the proto-Sun, then underwent considerable radial transport until they reached the gas giant planet region where the long-period comets originated. We hypothesize instead that silicate dust grains were annealed in situ by shock waves triggered by gravitational instabilities. We assume a shock speed of 5 km s-1, a plausible value for shocks driven by gravitational instabilities. We calculate the peak temperatures of micron and submicron amorphous pyroxene grains of chondritic composition under conditions typical in protoplanetary disks at 5-10 AU. Our results also apply to chondritic amorphous olivine grains. We show that in situ thermal annealing of submicron- and micron-sized silicate dust grains can occur, obviating the need for large-scale radial transport." @default.
• W2129668049 created "2016-06-24" @default.
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• W2129668049 date "2002-02-01" @default.
• W2129668049 modified "2023-10-09" @default.
• W2129668049 title "Annealing of Silicate Dust by Nebular Shocks at 10 AU" @default.
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• W2129668049 doi "https://doi.org/10.1086/339363" @default.
• W2129668049 hasPublicationYear "2002" @default.
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