Broadband extended emission in gravitational waves from core-collapse supernovae
Aug 31, 20157 pages
Published in:
- Astrophys.J. 812 (2015) 2, 124
- Published: Oct 14, 2015
e-Print:
- 1509.00404 [astro-ph.HE]
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Abstract: (IOP)
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 h(char) ∝ f(1/6) at f < fb and h(char) ∝ 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.Note:
- to appear in ApJ
- accretion, accretion disks
- gravitational waves
- stars: massive
- supernovae: general
- energy: accretion
- star: massive
- gravitational radiation
- angular momentum
- viscosity
- black hole
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