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We present observations of pure rotational molecular hydrogen emission fromthe Herbig Ae star, AB Aurigae. Our observations were made using the TexasEchelon Cross Echelle Spectrograph (TEXES) at the NASA Infrared TelescopeFacility and the Gemini North Observatory. We searched for H2 emission in theS(1), S(2), and S(4) lines at high spectral resolution and detected all three.By fitting a simple model for the emission in the three transitions, we deriveT = 670 +/- 40 K and M = 0.52 +/- 0.15 earth masses for the emitting gas. Basedon the 8.5 km/s FWHM of the S(2) line, assuming the emission comes from thecircumstellar disk, and with an inclination estimate of the AB Aur system takenfrom the literature, we place the location for the emission near 18 AU.Comparison of our derived temperature to a disk structure model suggests thatUV and X-ray heating are important in heating the disk atmosphere.

TEXES Observations of Pure Rotational H2 Emission From AB Aurigae