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Neutron star - white dwarf binaries: probing formation pathways and natal kicks with LISA

Lookup NU author(s): Dr Andrei IgoshevORCiD

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Abstract

Neutron star-white dwarf (NS + WD) binaries offer a unique opportunity for studying NS-specific phenomena with gravitational waves. In this paper, we employ the binary population synthesis technique to study the Galactic population of NS + WD binaries with the future Laser Interferometer Space Antenna (LISA). We anticipate approximately O(102)detectable NS + WD binaries by LISA, encompassing both circular and eccentric ones formed via different pathways. Despite the challenge of distinguishing these binaries from more prevalent double white dwarfs (especially at frequencies below 2 mHz), we show that their eccentricity and chirp mass distributions may provide avenues to explore the NS natal kicks and common envelope evolution. Additionally, we investigate the spatial distribution of detectable NS + WD binaries relative to the Galactic plane and discuss prospects for identifying electromagnetic counterparts at radio wavelengths. Our results emphasise LISA's capability to detect and characterize NS + WD binaries and to offer insights into the properties of the underlying population. Our conclusions carry significant implications for shaping LISA data analysis strategies and future data interpretation.

Publication metadata

Author(s): Korol V, Igoshev AP, Toonen S, Karnesis N, Moore CJ, Finch E, Klein A

Publication type: Article

Publication status: Published

Journal: Monthly Notices of the Royal Astronomical Society

Year: 2024

Volume: 530

Issue: 1

Pages: 844-860

Print publication date: 01/05/2024

Online publication date: 27/03/2024

Acceptance date: 22/03/2024

Date deposited: 22/01/2025

ISSN (print): 0035-8711

ISSN (electronic): 1365-2966

Publisher: Oxford University Press

URL: https://doi.org/10.1093/mnras/stae889

DOI: 10.1093/mnras/stae889

Data Access Statement: Mock catalogues produced as part of this study are available on Zenodo 10.5281/zenodo.10854469.

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