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We report high resolution NIR spectroscopy of CO and OH emission from theHerbig Be star HD100546. We discuss how our results bear striking resemblanceto several theoretically predicted signposts of giant planet formation. Theproperties of the CO and OH emission lines are consistent with our earlierinterpretation that these diagnostics provide indirect evidence for a companionthat orbits the star close to the disk wall (at ~13au). The asymmetry of the OHspectral line profiles and their lack of time variability are consistent withemission from gas in an eccentric orbit at the disk wall that is approximatelystationary in the inertial frame. The time variable spectroastrometricproperties of the CO v=1-0 emission line point to an orbiting source of COemission with an emitting area similar to that expected for a circumplanetarydisk (~0.1au^2) assuming the CO emission is optically thick. We also consider acounterhypothesis to this interpretation, namely that the variable CO emissionarises from a bright spot on the disk wall. We conclude with a brief suggestionof further work that can distinguish between these scenarios.

NIR Spectroscopy of the HAeBe Star HD 100546: III. Further Evidence of an Orbiting Companion?