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- W2049665034 endingPage "2" @default.
- W2049665034 startingPage "2" @default.
- W2049665034 abstract "Water vapor has been detected in protoplanetary disks. In this work we model the distribution of water vapor in protoplanetary disks with a thermo-chemical code. For a set of parameterized disk models, we calculate the distribution of dust temperature and radiation field of the disk with a Monte Carlo method, and then solve the gas temperature distribution and chemical composition. The radiative transfer includes detailed treatment of scattering by atomic hydrogen and absorption by water of Lyman alpha photons, since the Lyman alpha line dominates the UV spectrum of accreting young stars. In a fiducial model, we find that warm water vapor with temperature around 300 K is mainly distributed in a small and well-confined region in the inner disk. The inner boundary of the warm water region is where the shielding of UV field due to dust and water itself become significant. The outer boundary is where the dust temperature drops below the water condensation temperature. A more luminous central star leads to a more extended distribution of warm water vapor, while dust growth and settling tends to reduce the amount of warm water vapor. Based on typical assumptions regarding the elemental oxygen abundance and the water chemistry, the column density of warm water vapor can be as high as 1E22 cm^{-2}. A small amount of hot water vapor with temperature higher than ~300 K exists in a more extended region in the upper atmosphere of the disk. Cold water vapor with temperature lower than 100 K is distributed over the entire disk, produced by photodesorption of the water ice." @default.
- W2049665034 created "2016-06-24" @default.
- W2049665034 creator A5004002392 @default.
- W2049665034 creator A5017064324 @default.
- W2049665034 date "2014-08-07" @default.
- W2049665034 modified "2023-10-18" @default.
- W2049665034 title "WATER VAPOR DISTRIBUTION IN PROTOPLANETARY DISKS" @default.
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