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Stochastically-triggered photospheric light variations reaching $\sim$$40$mmag peak-to-valley amplitudes have been detected in the O8Iaf supergiant V973Scorpii as the outcome of two months of high-precision time-resolvedphotometric observations with the BRIght Target Explorer (BRITE)nanosatellites. The amplitude spectrum of the time series photometry exhibits apronounced broad bump in the low-frequency regime ($\lesssim$$0.9$ d$^{-1}$)where several prominent frequencies are detected. A time-frequency analysis ofthe observations reveals typical mode lifetimes of the order of $5-10$ days.The overall features of the observed brightness amplitude spectrum of V973 Scomatch well with those extrapolated from two-dimensional hydrodynamicalsimulations of convectively-driven internal gravity waves randomly excited fromdeep in the convective cores of massive stars. An alternative or additionalpossible source of excitation from a subsurface convection zone needs to beexplored in future theoretical investigations.

A BRITE view on the massive O-type supergiant V973 Scorpii: Hints towards internal gravity waves or subsurface convection zones