Effect of Coriolis force on the linear stability of subaqueous dunes with erodible and non-erodible beds

•Analyzed the effect of Coriolis parameter on stability of erodible dunes.•Observed one new mode (f-mode) for non-erodible and erodible beds.•The f-mode becomes unstable at a threshold value of Coriolis parameter.•The wave speed of the f-mode is invariant at large wavenumbers.