### Abstract

The recent LIGO-Virgo detection of gravitational waves from a binary neutron star inspiral event GW170817 and the discovery of its accompanying electromagnetic signals mark a new era for multimessenger astronomy. In the coming years, advanced gravitational-wave detectors are likely to detect tens to hundreds of similar events. Neutron stars in binaries can possess significant spin, which is imprinted on the gravitational waveform via the effective spin parameter χeff. We explore the astrophysical inferences made possible by gravitational-wave measurements of χeff. First, using a fiducial model informed by radio observations, we estimate that ≈15-30% of binary neutron stars should have spins measurable at ?90% confidence level by advanced detectors assuming the spin axis of the recycled neutron star aligns with the total orbital angular momentum of the binary. Second, using Bayesian inference, we show that it is possible to tell whether or not the spin axis of the recycled neutron star tends to be aligned with the binary orbit using ?30 detections. Finally, interesting constraints can be placed on neutron star magnetic field decay after ?300 detections, if the spin periods and magnetic field strengths of Galactic binary neutron stars are representative of the merging population.

Original language | English |
---|---|

Article number | 043002 |

Number of pages | 14 |

Journal | Physical Review D |

Volume | 98 |

Issue number | 4 |

DOIs | |

Publication status | Published - 15 Aug 2018 |

### Keywords

- Pulsars
- Radio pulsar
- Neutron stars

### Cite this

*Physical Review D*,

*98*(4), [043002]. https://doi.org/10.1103/PhysRevD.98.043002

}

*Physical Review D*, vol. 98, no. 4, 043002. https://doi.org/10.1103/PhysRevD.98.043002

**Inferring the population properties of binary neutron stars with gravitational-wave measurements of spin.** / Zhu, Xingjiang; Thrane, Eric; Osłowski, Stefan; Levin, Yuri; Lasky, Paul D.

Research output: Contribution to journal › Article › Research › peer-review

TY - JOUR

T1 - Inferring the population properties of binary neutron stars with gravitational-wave measurements of spin

AU - Zhu, Xingjiang

AU - Thrane, Eric

AU - Osłowski, Stefan

AU - Levin, Yuri

AU - Lasky, Paul D.

PY - 2018/8/15

Y1 - 2018/8/15

N2 - The recent LIGO-Virgo detection of gravitational waves from a binary neutron star inspiral event GW170817 and the discovery of its accompanying electromagnetic signals mark a new era for multimessenger astronomy. In the coming years, advanced gravitational-wave detectors are likely to detect tens to hundreds of similar events. Neutron stars in binaries can possess significant spin, which is imprinted on the gravitational waveform via the effective spin parameter χeff. We explore the astrophysical inferences made possible by gravitational-wave measurements of χeff. First, using a fiducial model informed by radio observations, we estimate that ≈15-30% of binary neutron stars should have spins measurable at ?90% confidence level by advanced detectors assuming the spin axis of the recycled neutron star aligns with the total orbital angular momentum of the binary. Second, using Bayesian inference, we show that it is possible to tell whether or not the spin axis of the recycled neutron star tends to be aligned with the binary orbit using ?30 detections. Finally, interesting constraints can be placed on neutron star magnetic field decay after ?300 detections, if the spin periods and magnetic field strengths of Galactic binary neutron stars are representative of the merging population.

AB - The recent LIGO-Virgo detection of gravitational waves from a binary neutron star inspiral event GW170817 and the discovery of its accompanying electromagnetic signals mark a new era for multimessenger astronomy. In the coming years, advanced gravitational-wave detectors are likely to detect tens to hundreds of similar events. Neutron stars in binaries can possess significant spin, which is imprinted on the gravitational waveform via the effective spin parameter χeff. We explore the astrophysical inferences made possible by gravitational-wave measurements of χeff. First, using a fiducial model informed by radio observations, we estimate that ≈15-30% of binary neutron stars should have spins measurable at ?90% confidence level by advanced detectors assuming the spin axis of the recycled neutron star aligns with the total orbital angular momentum of the binary. Second, using Bayesian inference, we show that it is possible to tell whether or not the spin axis of the recycled neutron star tends to be aligned with the binary orbit using ?30 detections. Finally, interesting constraints can be placed on neutron star magnetic field decay after ?300 detections, if the spin periods and magnetic field strengths of Galactic binary neutron stars are representative of the merging population.

KW - Pulsars

KW - Radio pulsar

KW - Neutron stars

UR - http://www.scopus.com/inward/record.url?scp=85052655874&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.98.043002

DO - 10.1103/PhysRevD.98.043002

M3 - Article

AN - SCOPUS:85052655874

VL - 98

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 4

M1 - 043002

ER -