摘要
We present self-consistent three-dimensional core-collapse supernova simulations of a rotating20M_(⊙)progenitor model with various initial angular velocities from0.0to4.0rad s ⁻¹using a smoothed particle hydrodynamics code, SPHYNX, and a grid-based hydrodynamics code, FLASH. We identify two strong gravitational-wave features, with peak frequencies of∼300Hz and∼1.3kHz in the first100ms postbounce. We demonstrate that these two features are associated with them=1deformation from the proto-neutron star (PNS) modulation induced by the low- T/|W|instability, regardless of the simulation code. The300Hz feature is present in models with an initial angular velocity between1.0and4.0rad s ⁻¹ , while the1.3kHz feature is present only in a narrower range, from1.5to3.5rad s ⁻¹ . We show that the1.3kHz signal originates from the high-density inner core of the PNS, and them=1deformation triggers a strong asymmetric distribution of electron anti-neutrinos. In addition to the300Hz and1.3kHz features, we also observe one weaker but noticeable gravitational-wave feature from higher-order modes in the range between1.5and3.5rad s ⁻¹ . Its peak frequency is around800Hz initially and gradually increases to900-1000Hz. Therefore, in addition to the gravitational bounce signal, the detection of the300Hz,1.3kHz, the higher-order mode, and even the related asymmetric emission of neutrinos, could provide additional diagnostics to estimate the initial angular velocity of a collapsing core.