English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Gravitational waves (GW) generated during a core-collapse supernova open awindow into the heart of the explosion. At core bounce, progenitors with rapidcore rotation rates exhibit a characteristic GW signal which can be used toconstrain the properties of the core of the progenitor star. We investigate thedynamics of rapidly rotating core collapse, focusing on hydrodynamic wavesgenerated by the core bounce and the GW spectrum they produce. The centrifugaldistortion of the rapidly rotating proto-neutron star (PNS) leads to thegeneration of axisymmetric quadrupolar oscillations within the PNS andsurrounding envelope. Using linear perturbation theory, we estimate thefrequencies, amplitudes, damping times, and GW spectra of the oscillations. Ouranalysis provides a qualitative explanation for several features of the GWspectrum and shows reasonable agreement with nonlinear hydrodynamicsimulations, although a few discrepancies due to non-linear/rotational effectsare evident. The dominant early postbounce GW signal is produced by thefundamental quadrupolar oscillation mode of the PNS, at a frequency $0.70 \,{\rm kHz} \lesssim f \lesssim 0.80\,{\rm kHz}$, whose energy is largely trappedwithin the PNS and leaks out on a $\sim\!10$ ms timescale. Quasi-radialoscillations are not trapped within the PNS and quickly propagate outwardsuntil they steepen into shocks. Both the PNS structure and Coriolis/centrifugalforces have a strong impact on the GW spectrum, and a detection of the GWsignal can therefore be used to constrain progenitor properties.

Supernova Seismology: Gravitational Wave Signatures of Rapidly Rotating Core Collapse