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A New Gravitational Wave Signature of Low-$T/|W|$ Instability in Rapidly Rotating Stellar Core Collapse

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arxiv 1909.09730 v2 pith:PFDHKYPE submitted 2019-09-20 astro-ph.HE

Shota Shibagaki , Takami Kuroda , Kei Kotake , Tomoya Takiwaki This is my paper
classification astro-ph.HE
keywords timecorefeaturesgravitationalinstabilitylow-modulationquasi-periodic
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abstract

We present results from a full general relativistic three-dimensional hydrodynamics simulation of rapidly rotating core-collapse of a 70 M$_{\odot}$ star with three-flavor spectral neutrino transport. We find a strong gravitational wave (GW) emission that originates from the growth of the one- and two-armed spiral waves extending from the nascent proto-neutron star (PNS). The GW spectrogram shows several unique features that are produced by the non-axisymmetric instabilities. After bounce, the spectrogram first shows a transient quasi-periodic time modulation at $\sim$ 450 Hz. In the second active phase, it again shows the quasi-periodic modulation but with the peak frequency increasing with time, which continues until the final simulation time. From our detailed analysis, such features can be well explained by a combination of the so-called low-$T/|W|$ instability and the PNS core contraction.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. The Gravitational-Wave Power Gap in Core-Collapse Supernovae: Insights from 60 Axisymmetric Simulations

    astro-ph.HE 2026-03 conditional novelty 6.0 of 10

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    astro-ph.SR 2025-09 conditional novelty 5.0 of 10

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  3. Toward More Realistic Machine-Learning Inference of the Dense-Matter Equation of State from Supernova Gravitational Waves

    astro-ph.HE 2026-03 conditional novelty 4.5 of 10

    Using a linear SVM, EOS classification from bounce gravitational waves remains robust to real noise, progenitor diversity, and bounce-time uncertainty in the frequency domain, but collapses in the time domain under ti...

  4. Parameter Estimation Horizon of Core-Collapse Supernovae with a Network of Gravitational-Wave Detectors

    astro-ph.HE 2026-08 conditional novelty 4.0 of 10

    A CNN can recover supernova peak frequency out to about 30 kpc and rotation/amplitude out to 200-250 kpc with current networks, extending to roughly 300 kpc and 2-2.5 Mpc with third-generation detectors.

  5. Core-Collapse Supernovae and their Gravitational Wave Signals: The Status of Theory and Modeling

    astro-ph.HE 2026-03 unverdicted novelty 1.0 of 10

    A status review of core-collapse-supernova gravitational-wave theory: predicted signal components, their physical dependencies, and the uncertainty-quantification agenda needed to exploit a Galactic detection.

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