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We present high-resolution spectroscopic mid-infrared observations of thecircumstellar disk around the Herbig Ae star HD97048 obtained with the VLTImager and Spectrometer for the mid-InfraRed (VISIR). We conducted observationsof mid-infrared pure rotational lines of molecular hydrogen (H2) as a tracer ofwarm gas in the disk surface layers. In a previous paper, we reported thedetection of the S(1) pure rotational line of H2 at 17.035 microns and arguedit is arising from the inner regions of the disk around the star. We used VISIRon the VLT for a more comprehensive study based on complementary observationsof the other mid-infrared molecular transitions, namely S(2) and S(4) at 12.278microns and 8.025 microns respectively, to investigate the physical propertiesof the molecular gas in the circumstellar disk around HD97048. We do not detectneither the S(2) line nor the S(4) H2 line from the disk of HD97048, but wederive upper limits on the integrated line fluxes which allows us to estimatean upper limit on the gas excitation temperature, T_ex < 570 K. This limit onthe temperature is consistent with the assumptions previously used in theanalysis of the S(1) line, and allows us to set stronger contraints on the massof warm gas in the inner regions of the disk. Indeed, we estimate the mass ofwarm gas to be lower than 0.1 M_Jup. We also discuss the probable physicalmechanisms which could be responsible of the excitation of H2 in the disk ofHD97048.

Molecular hydrogen in the disk of the Herbig Ae star HD97048