Broadband extended emission in gravitational waves from core-collapse supernovae

Amir Levinson, Maurice H.P.M. Van Putten*, Guy Pick

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Immediately following their formation, black holes in the core-collapse stage of massive stars are expected to surge in mass and angular momentum by hyper-accretion. Here we describe a general framework of extended emission in gravitational waves from non-axisymmetric accretion flows from the fallback matter of the progenitor envelope. This framework shows (a) a maximum efficiency in the conversion of accretion energy into gravitational waves at hyper-accretion rates exceeding a critical value set by the ratio of the quadrupole mass inhomogeneity and viscosity, with (b) a peak characteristic strain amplitude at the frequency fb = Ωb/π, where Ωb is the Keplerian angular velocity at which viscous torques equal angular momentum loss in gravitational radiation, with hchar ∝ f1/6 at f < fb and hchar ∝ f-1/6 at f > fb. Upcoming gravitational wave observations may probe this scaling by extracting broadband spectra using time-sliced matched filtering with chirp templates, which were recently developed for identifying turbulence in noisy time series.

Original languageEnglish
Article number124
JournalAstrophysical Journal
Issue number2
StatePublished - 20 Oct 2015


  • accretion, accretion disks
  • gravitational waves
  • stars: massive
  • supernovae: general


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