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We present high‐resolution (  R ∼ 50 000 ) spectroastrometry over the CO first overtone bandhead of a sample of seven intermediate/massive young stellar objects. These are primarily drawn from the Red MSX source (RMS) survey, a systematic search for young massive stars which has returned a large, well selected sample of such objects. The mean luminosity of the sample is approximately  5 × 10 4  L ⊙  , indicating the objects typically have a mass of  ∼15 M ⊙  . We fit the observed bandhead profiles with a model of a circumstellar disc, and find good agreement between the models and observations for all but one object. We compare the high angular precision ( 0.2–0.8 × 10 −3   arcsec) spectroastrometric data to the spatial distribution of the emitting material in the best‐fitting models. No spatial signatures of discs are detected, which is entirely consistent with the properties of the best‐fitting models. Therefore, the observations suggest that the CO bandhead emission of massive young stellar objects originates in small‐scale discs, in agreement with previous work. This provides further evidence that massive stars form via disc accretion, as suggested by recent simulations.

Probing discs around massive young stellar objects with CO first overtone emission ★ †