Targeted Search for Gravitational Waves from Highly Spinning Light Compact Binaries

Abstract

Searches for gravitational waves from compact-binary mergers, which to date have reported $\sim 100$ observations, have previously ignored binaries whose components are both consistent with the mass of neutron stars $(1M_{\odot }$ to $2M_{\odot })$ and have high dimensionless spin $>0.05$. While previous searches targeted sources that are representative of observed neutron star binaries in the galaxy, it is already known that neutron stars can regularly be spun up to a dimensionless spin of $\sim 0.4$, and in principle reach up to $\sim 0.7$ before breakup would occur. Furthermore, there may be primordial black hole binaries or exotic formation mechanisms to produce light black holes. In these cases, it is possible for the binary constituent to be spun up beyond that achievable by a neutron star. A single detection of this type of source would reveal a novel formation channel for compact-binaries. To determine if there is evidence for any such sources, we use PyCBC to conduct a targeted search of LIGO and Virgo data for light compact objects with high spin. Our analysis detects previously known observations GW170817 and GW200115; however, we report no additional mergers. The most significant candidate, not previously known, is consistent with the noise distribution, and so we constrain the merger rate of spinning light binaries.

arXiv commentv3: add comparison with lvk subsolar search; accepted by MNRAS; 6 pages, 5 figures, 1 table; data release at https://github.com/gwastro/high-spin-light-binary

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