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We investigate the physical properties and spatial distribution of CarbonMonoxide (CO) gas in the disks around the Herbig Ae/Be stars HD 97048 and HD100546.  Using high-spectral-resolution 4.588-4.715 $\mu$m spectra containingfundamental CO emission taken with CRIRES on the VLT, we probe thecircumstellar gas and model the kinematics of the emission lines. By usingspectro-astrometry on the spatially resolved targets, we constrain the physicalsize of the emitting regions in the disks. We resolve, spectrally andspatially, the emission of the $^{13}$CO v(1-0) vibrational band and the$^{12}$CO $v=1-0, v=2-1, v=3-2$ and $v=4-3$ vibrational bands in both targets,as well as the $^{12}$CO $v=5-4$ band in HD 100546. Modeling of the CO emissionwith a homogeneous disk in Keplerian motion, yields a best fit with an innerand outer radius of the CO emitting region of 11 and $\geq$ 100 AU for HD97048. HD 100546 is not fit well with our model, but we derive a lower limit onthe inner radius of 8 AU. The fact that gaseous [OI] emission was previouslydetected in both targets at significantly smaller radii suggests that CO may beeffectively destroyed at small radii in the surface layers of these disks

Evidence for CO depletion in the inner regions of gas-rich protoplanetary disks