2013

Host redshifts from gravitational-wave observations of binary neutron star mergers

Messenger, Chris, Takami, Kentaro, Gossan, Sarah et al.

Understand

Inspiralling compact binaries as standard sirens will soon become an invaluable tool for cosmology when advanced interferometric gravitational-wave detectors begin their observations in the coming years.

  • However, a degeneracy in the information carried by gravitational waves between the total rest-frame mass $M$ and the redshift $z$ of the source implies that neither can be directly extracted from the signal, but only the combination $M(1+z)$, the redshifted mass.
  • Recent work has shown that for binary neutron star systems, a tidal correction to the gravitational-wave phase in the late-inspiral signal that depends on the rest-frame source mass could be used to break the mass-redshift degeneracy.
  • We propose here to use the signature encoded in the post-merger signal to deduce the redshift to the source.

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