AAS 207th Meeting, 8-12 January 2006
Session 9 Circumstellar Disks I
Poster, Monday, 9:20am-7:00pm, January 9, 2006, Exhibit Hall

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[9.02] The TEXES/IRTF H2 Survey of Disk Sources

M. J. Richter (UC Davis), J. H. Lacy, D. T. Jaffe, M. A. Bitner (UT Austin), T. K. Greathouse (LPI Houston), G. A. Blake (Caltech)

We used TEXES, the Texas Echelon-cross-Echelle Spectrograph (Lacy et al. 2002), on the 3m NASA IRTF to search for mid-infrared rotational H2 emission from 18 young stellar objects. TEXES is a high spectral resolution, mid-infrared spectrograph in use on the 3m IRTF since 2000 and scheduled to become available as a visitor instrument on Gemini-North in 2006B. We concentrated on the J=3-1 (17.03 micron) and J=4-2 (12.28 micron) lines, spending roughly one hour of time for each line on each source. The high spectral resolution of TEXES gives R~60,000 for J=3-1 and R~80,000 for J=4-2. In certain cases, we also observed the J=6-4 (8.025 micron) feature. Roughly a third of the sources show either clear or potential detections. For the best cases, we have velocity-resolved information regarding the line flux at three separate transitions and can investigate the physical conditions of the emitting gas. Ratios of these mid-infrared lines are sensitive to gas with temperatures between roughly 200 and 800 K. Even non-detections can establish limits to the amount of warm, isolated H2 in the system.

Observations with TEXES are supported by NSF grant AST-0205518. MJR is supported by NASA award NNG04GG92G and NSF award AST-0307497.

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