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AbstractAbstract
[en] Gas kinematics are an important part of the planet formation process. Turbulence influences planetesimal growth and migration from the scale of submicron dust grains through gas-giant planets. Radio observations of resolved molecular line emission can directly measure this non-thermal motion and, taking advantage of the layered chemical structure of disks, different molecular lines can be combined to map the turbulence throughout the vertical extent of a protoplanetary disk. Here we present ALMA observations of three molecules (DCO+(3-2), C18O(2-1) and CO(2-1)) from the disk around HD 163296. We are able to place stringent upper limits (v turb < 0.06c s, <0.05c s, and <0.04c s for CO(2-1), C18O(2-1), and DCO+(3-2) respectively), corresponding to α ≲ 3 × 10−3, similar to our prior limit derived from CO(3-2). This indicates that there is little turbulence throughout the vertical extent of the disk, contrary to theoretical predictions based on the magnetorotational instability and gravitoturbulence. In modeling the DCO+ emission, we also find that it is confined to three concentric rings at 65.7 ± 0.9 au, , and 259 ± 1 au, indicative of a complex chemical environment.
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Available from http://dx.doi.org/10.3847/1538-4357/aa79f9; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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BETA DECAY RADIOISOTOPES, BETA-MINUS DECAY RADIOISOTOPES, CARBON COMPOUNDS, CARBON ISOTOPES, CARBON OXIDES, CHALCOGENIDES, DUSTS, EVEN-EVEN NUCLEI, FLUIDS, GASES, HYDROGEN COMPOUNDS, ISOTOPES, LIGHT NUCLEI, MILLISECONDS LIVING RADIOISOTOPES, NUCLEI, OXIDES, OXYGEN COMPOUNDS, RADIOISOTOPES, SIMULATION
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