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Observations of Water and other molecules in Protoplanetary Disk Atmospheres

Observations of Water and other molecules in Protoplanetary Disk Atmospheres. Colette Salyk UT Austin/McDonald Observatory Klaus Pontoppidan, Geoffrey Blake, Rowin Meijerink, Joan Najita, John Carr. Water vapor and organics detected in ‘typical’ circumstellar disks with Spitzer-IRS.

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Observations of Water and other molecules in Protoplanetary Disk Atmospheres

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  1. Observations of Water and other molecules in Protoplanetary Disk Atmospheres Colette Salyk UT Austin/McDonald Observatory Klaus Pontoppidan, Geoffrey Blake, Rowin Meijerink, Joan Najita, John Carr

  2. 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

  3. Ground-based follow-up confirms origin in planet-forming region of disk Line profiles consistent with ~few AU emitting radii Salyk et al. 2008

  4. Radial transport of water via diffusion (out) and icy-body migration (in) What disk processes might water emission probe? “snow line” low vapor pressure vapor diffuses outwards high vapor pressure vapor freezes out solids migrate inwards solids evaporate e.g. Stevenson & Lunine 1988; Ciesla & Cuzzi 2006

  5. Radial transport of water via diffusion (out) and icy-body migration (in) Water self-shielding What disk processes might water emission probe? Bethell & Bergin 2009

  6. 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 What disk processes might water emission probe? Clearly a challenge to disentangle multiple effects

  7. 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

  8. 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

  9. Sampled disks show significant variety

  10. Pontoppidan et al., in prep

  11. -Lines are actually spectrally uresolved line blends at the resolution of Spitzer-IRS -Lines probe a large range of excitation temperatures Pontoppidan et al., in prep

  12. Water vapor and organic emission is commonaround low-mass young stars Pontoppidan et al. , in prep

  13. Detection rates drop precipitously for SpT<G Pontoppidan et al. , in prep

  14. Transitional disks do not show emission

  15. Emission of water correlates with CO emission

  16. LTE models can be used to estimate density, T

  17. But in general do a poor job of matching the data

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