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- W3105398854 abstract "We propose the possibility of a new phenomenon affecting the settling of dust grains at the terrestrial region in early protoplanetary disks. Sinking dust grains evaporate in a hot inner region during the early stage of disk evolution, and the effects of condensation and evaporation on vertical dust settling can be significant. A 1-D dust settling model considering both physical and chemical aspects is presented in this paper. Modeling results show that dust grains evaporate as they descend into the hotter interior and form a condensation front, above which dust-composing major elements, Mg, Si, and Fe, accumulate, creating a large temperature gradient. Repeated evaporation at the front inhibits grain growth, and small grain sizes elevate the opacity away from the mid-plane. Self-consistent calculations including radiative heat transfer and condensation theory suggest that the mid-disk temperature could be high enough for silicates to remain evaporated longer than previous estimates. The formation of a condensation front leads to contrasting settling behaviors between highly refractory elements, such as Al and Ca, and moderately refractory elements, such as Mg, Si, and Fe, suggesting that elemental abundance in planetesimals may not be a simple function of volatility." @default.
- W3105398854 created "2020-11-23" @default.
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- W3105398854 date "2017-10-27" @default.
- W3105398854 modified "2023-09-26" @default.
- W3105398854 title "Effects of Chemistry on Vertical Dust Motion in Early Protoplanetary Disks" @default.
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- W3105398854 doi "https://doi.org/10.3847/1538-4357/aa8cd1" @default.
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