The TEXES Survey of H2 in Protoplanetary Disks

Details The TEXES Survey of H2 in Protoplanetary Disks The TEXES Survey of H2 in Protoplanetary Disks

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.8104b&link_type=abstract

American Astronomical Society, AAS Meeting #211, #81.04; Bulletin of the American Astronomical Society, Vol. 39, p.872

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Over the past several years, we have undertaken a search for mid-infrared pure rotational H2 emission from protoplanetary disks using TEXES, the Texas Echelon Cross Echelle Spectrograph on both the IRTF and, more recently, Gemini North. TEXES is a high spectral resolution, mid-infrared spectrograph available to the astronomical community on both the NASA IRTF and Gemini North telescopes. We gave highest priority to observations of each target at both the J=3-1 (17.035 microns) and J=4-2 (12.279 microns) settings. Sources with a detection at either setting were followed up with observations at the J=6-4 (8.026 microns) setting to constrain the temperature of the emitting gas. Flux ratios of the three lines are sensitive to gas temperatures between 200 and 800 K. We have observed 28 sources in at least one line including 8 Herbig Ae/Be stars, 8 class I, 5 class II, 2 class III, 4 FU Ori, and 1 debris disk and detected emission from 6/28. The lines we detect are generally narrow (FWHM 10 km/s) and have small equivalent width. The high spectral resolution available with TEXES, R 60,000 for J=3-1 and R 80,000 for J=4-2 and J=6-4, coupled with knowledge of the disk inclination by other means allows us to estimate the radial location of the emitting gas. Non-detections provide limits on the amount of warm gas in regions where the dust is optically thin. Observations with TEXES are supported by NSF grant AST-0607312.

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