Detection of Hot Water Vapor in the Inner Regions of Protoplanetary Disks

Details Detection of Hot Water Vapor in the Inner Regions of Protoplanetary Disks Detection of Hot Water Vapor in the Inner Regions of Protoplanetary Disks

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.8103p&link_type=abstract

American Astronomical Society, AAS Meeting #211, #81.03; Bulletin of the American Astronomical Society, Vol. 39, p.871

Astronomy and Astrophysics

Astronomy

Scientific paper

We present Spitzer InfraRed Spectrometer (IRS), NIRSPEC and CRIRES detections of hot (T>800; K) water vapor emission from the inner regions of protoplanetary disks. Spitzer-IRS spectra were obtained from the 'cores to disks' (c2d) Legacy program, and show abundant evidence for water across the complete 10-20 micron region covered by the IRS ShortHi module. Follow-up observations in the L-band ( 3 micron) atmospheric window were obtained with NIRSPEC (R 25,000) on the Keck II telescope and CRIRES (R 100,000) at the VLT, and confirm the prominence of water emission. Combining constraints from these observations, plus NIRSPEC/CRIRES M-band ( 4.7 micron) observations of CO in disks, we find temperatures and lineshapes consistent with emitting radii inside of 1 AU, extending at most to a few AU. In several objects emission from the OH radical is also detected. Thus these observations provide a window into the terrestrial-planet-forming region of disks, and insight into inner-disk chemistry. Water column densities also imply higher-than-ISM water abundances, relative to CO, even though the presence of an ice condensation front can quickly deplete an inner disk of its water vapor. This raises the exciting possibility that we are seeing the result of inward radial transport (followed by sublimation) of icy solids in disks - a process predicted by core-accretion planet formation models.

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