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Using the ULTRASPEC instrument mounted on the 2.4-m Thai National Telescope,we observed two large flares, each with a total energy close to 10^34 erg withsub-second cadence. A combination of a wavelet analysis, a Fourier transformplus an empirical mode decomposition, reveals quasi-period pulsations (QPP)which exhibit an apparent doubling of the oscillation period. Both eventsshowed oscillations of a few minutes over a interval of several minutes, anddespite the availability of sub-second cadence, there was no evidence ofsub-minute oscillations. The doubling of the QPP periods and shorter lifetimeof shorter-period QPP modes strongly favour resonant dynamics ofmagnetohydrodynamic waves in a coronal loop. We estimate loop lengths to be0.2-0.7 R*, in agreement with a typical length of solar coronal loops. Theseobservations presents rare and compelling evidence for the presence of compactplasma loops in a stellar corona.

Doubling of minute-long Quasi-Periodic Pulsations from super-flares on a low mass star