Radiation Mechanism of Twin Kilohertz Quasi-Periodic Oscillations in a Neutron Star Low-Mass X-ray Binary Explained by a Novel Two-Layer Corona Model

Twin kilohertz quasi-periodic oscillations (kHz QPOs) observed in neutron star low-mass X-ray binaries (NS-LMXBs) can be explained by the interaction of twin MHD waves, generated at the innermost radius of an accretion disc, with a two-layered corona surrounding the neutron star.