observations of water and other molecules in protoplanetary disk atmospheres colette salyk ut...
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![Page 1: Observations of Water and other molecules in Protoplanetary Disk Atmospheres Colette Salyk UT Austin/McDonald Observatory Klaus Pontoppidan, Geoffrey Blake,](https://reader035.vdocument.in/reader035/viewer/2022070410/56649f1c5503460f94c31da0/html5/thumbnails/1.jpg)
Observations of Water and other molecules in Protoplanetary Disk
Atmospheres
Colette SalykUT Austin/McDonald ObservatoryKlaus Pontoppidan, Geoffrey Blake, Rowin Meijerink,
Joan Najita, John Carr
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Water vapor and organics detected in ‘typical’ circumstellar disks with Spitzer-IRS
Spitzer IRS: Carr & Najita 2008; Salyk et al. 2008 T~500-1000 K
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Ground-based follow-up confirms origin in planet-forming region of disk
Salyk et al. 2008
Line profiles consistent with ~few AU emitting radii
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What disk processes might water emission probe?
Radial transport of water via diffusion (out) and icy-body migration (in)
“snow line”
e.g. Stevenson & Lunine 1988; Ciesla & Cuzzi 2006
vapor freezes out
vapor diffuses outwards
low vapor pressurehigh vapor pressure
solids migrate inwardssolids evaporate
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What disk processes might water emission probe?
Radial transport of water via diffusion (out) and icy-body migration (in)
Water self-shielding
Bethell & Bergin 2009
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What disk processes might water emission probe?
Radial transport of water via diffusion (out) and icy-body migration (in)
Water self-shielding
Radiative processes
Condensation fronts and vertical transport
Disk chemistry
Small dust grain growth/settling
Clearly a challenge to disentangle multiple effects
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GO5 program: Water in Disks (PI: J. Carr)
-52 class II disks in multiple star-forming regions-Designed to cover a range of stellar/disk parameters
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GO5 program: Water in Disks (PI: J. Carr)
-52 class II disks in multiple star-forming regions-Designed to cover a range of stellar/disk parameters-Subset of these disks + archived programs results in sample shown here
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Sampled disks show significant variety
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Pontoppidan et al., in prep
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Pontoppidan et al., in prep
-Lines are actually spectrally uresolved line blends at the resolution of Spitzer-IRS -Lines probe a large range of excitation temperatures
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Water vapor and organic emission is commonaround low-mass young stars
Pontoppidan et al. , in prep
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Detection rates drop precipitously for SpT<G
Pontoppidan et al. , in prep
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Transitional disks do not show emission
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Emission of water correlates with CO emission
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LTE models can be used to estimate density, T
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But in general do a poor job of matching the data
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