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In this paper we present high resolution 4.7micron spectra of the isolatedHerbig Be star HD100546. HD100546 has been the subject of intense scrutinybecause it is a young nearby star with a transitional disk. We observe theDelta v=1 ro-vibrational CO transitions in order to clarify the distribution ofwarm gas in the inner disk. Modeling of the CO spectrum indicates that the gasis vibrationally excited by collisions and UV fluorescence. The observedemission extends from 13-100AU. The inner edge of the molecular gas emission isconsistent with the inner edge of the optically thick dust disk indicating thatthe inner hole is not simply a hole in the dust opacity but is likely clearedof gas as well. The rotational temperature of the CO is ~1000K - much hotterthan the ~200K CO in the otherwise similar transitional disk surroundingHD141569. The origin of this discrepancy is likely linked to the brighter PAHemission observed toward HD100546. We use the excitation of the CO to constrainthe geometry of the inner disk and comment on the evolutionary state of thesystem.

Tracing the inner edge of the disk around HD 100546 with Ro-vibrational CO Emission Lines