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Inferring physical properties of stellar collapse by third-generation gravitational-wave detectors

Chaitanya Afle* and Duncan A. Brown

  • Department of Physics, Syracuse University, Syracuse, New York 13244, USA and Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA

  • *chafle@syr.edu
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Phys. Rev. D 103, 023005 – Published 6 January, 2021

DOI: https://doi.org/10.1103/PhysRevD.103.023005

Abstract

Galactic core-collapse supernovae are among the possible sources of gravitational waves. We investigate the ability of gravitational-wave observatories to extract the properties of the collapsing progenitor from the gravitational waves radiated. We use simulations of supernovae that explore a variety of progenitor core rotation rates and nuclear equations of state and examine the ability of current and future observatories to determine these properties using gravitational-wave parameter estimation. We use principal component analysis of the simulation catalog to determine the dominant features of the waveforms and create a map between the measured properties of the waveform and the physical properties of the progenitor star. We use Bayesian parameter inference and the parameter map to calculate posterior probabilities for the physical properties given a gravitational-wave observation. We demonstrate our method on a random sample of the waveform catalog that was excluded from construction of the principal component analysis and estimate the ratio of the progenitor’s core rotational kinetic energy to potential energy (β) and the post bounce oscillation frequency. For a supernovae at the distance of the galactic center (8.1 kpc) with β=0.02 our method can estimate β with a 90% credible interval of 0.004 for Advanced LIGO, improving to 0.0008 for Cosmic Explorer, the proposed third-generation detector. We demonstrate that if the core is rotating sufficiently rapidly for a signal source within the Milky Way observed by Cosmic Explorer, our method can also extract the post bounce oscillation frequency of the protoneutron star to a precision of within 5 Hz (90% credible interval) allowing us to constrain the nuclear equation of state. For a supernovae at the distance of the Magellanic Clouds (48.5 kpc) Cosmic Explorer’s ability to measure these parameters decreases slightly to 0.003 for rotation and 11 Hz for the postbounce oscillation frequency (90% credible interval). Sources in Magellanic Clouds with β<0.02 will be too distant for Advanced LIGO to measure these properties.

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Phys. Rev. D 103, 023005– Published 6 January, 2021
  • Received 8 October 2020
  • Accepted 30 November 2020
Article part of CHORUS
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