Tracing discs around massive YSOs using CO emission

There is little observational evidence that discs play a role in massive star formation. We present spectra of 20 massive young stellar objects (MYSOs) displaying CO first overtone bandhead emission. We model the emission under the assumption that it originates in a circumstellar disc, and find good fits to all spectra. The best fitting discs are found to be spread across a wide range of inclinations, consistent with accretion disc models, and within the dust sublimation radius. Our results provide strong evidence for small scale gaseous accretion discs, supporting the scenario in which massive stars form via disc accretion