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    Spectrally Resolved Pure Rotational Lines of Water in Protoplanetary Disks

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    2010_10_Pontoppidan.pdf (302.0Kb)
    Date
    2010-10
    Author
    Pontoppidan, Klaus M.
    Salyk, Colette
    Blake, Geoffrey A.
    Kaufl, Hans U.
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    Abstract
    We present ground-based high-resolution N-band spectra (Delta v = 15 km s(-1)) of pure rotational lines of water vapor in two protoplanetary disks surrounding the pre-main-sequence stars AS 205N and RNO 90, selected based on detections of rotational water lines by the Spitzer InfraRed Spectrograph. Using VISIR on the Very Large Telescope, we spectrally resolve individual lines and show that they have widths of 30-60 km s(-1), consistent with an origin in Keplerian disks at radii of similar to 1AU. The water lines have similar widths to those of the CO at 4.67 mu m, indicating that the mid-infrared water lines trace similar radii. The rotational temperatures of the water are 540 and 600 K in the two disks, respectively. However, the line ratios show evidence of non-LTE excitation, with low-excitation line fluxes being overpredicted by two-dimensional disk LTE models. Due to the limited number of observed lines and the non-LTE line ratios, an accurate measure of the water ortho/para (O/P) ratio is not available, but a best estimate for AS 205N is O/P = 4.5 +/- 1.0, apparently ruling out a low-temperature origin of the water. The spectra demonstrate that high-resolution spectroscopy of rotational water lines is feasible from the ground, and further that ground-based high-resolution spectroscopy is likely to significantly improve our understanding of the inner disk chemistry revealed by recent Spitzer observations.
    Department
    Astronomy
    Subject
    astrochemistry
    protoplanetary disks
    planetary systems
    planet-forming region
    circumstellar disks
    young stars
    gas
    emission
    spectroscopy
    ophiuchus
    h2o
    molecules
    evolution
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/43012
    xmlui.dri2xhtml.METS-1.0.item-citation
    Pontoppidan, Klaus M., Colette Salyk, Geoffrey A. Blake, and Hans Ulrich Käufl. "Spectrally resolved pure rotational lines of water in protoplanetary disks." The Astrophysical Journal Letters, Vol. 722, No. 2 (Oct., 2010): L173.
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