LEGWORK: A python package for computing the evolution and detectability of stellar-origin gravitational-wave sources with space-based detectors

Wagg, Tom; Breivik, Katelyn; de Mink, Selma E.

doi:10.48550/arxiv.2111.08717

Cited by 2 publications

(2 citation statements)

References 47 publications

(65 reference statements)

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“…Here, we use the Python package LEGWORK 5 (Wagg et al 2021) to calculate the strain amplitude h 0 and characteristic strain amplitude h c of binaries systems and the evolution of their orbital frequency f orb . LEGWORK is also used to calculate SNRs of GW emitted from inspiraling binary systems as detected by certain GW detectors.…”

Section: Gravitational Wavesmentioning

confidence: 99%

Revealing Double White Dwarf Mergers with Multi-messenger Signals

Yang¹,

Tam²,

Yang³

2022

Res. Astron. Astrophys.

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A significant number of double white dwarfs (DWDs) are believed to merge within the Hubble time due to the gravitational wave (GW) emission during their inspiraling phase. The outcome of a DWD system is either a type Ia Supernova as the double-degenerate model, or a massive, long-lasting merger remnant. Expected multi-messenger signals of these events will help us to distinguish detailed merging physical processes. In this work, we aim to provide a generic scenario of DWD merging, investigate the emission of all major messengers, with a focus on GWs and neutrinos. Our goal is to provide some guidance for current and future (collaborative) efforts of multi-messenger observations. Throughout the merging evolution of a DWD system, different messengers (GW, neutrino and electromagnetic wave) will dominate at different times. In this work, we show that DWD merger events located at the distance of 1 kpc can indeed produce detectable signals of GWs and neutrinos. The GW frequency are in 0.8-1.8 Hz band around 10 days before tidal disruption begin. We estimate that in optimistic situations, the neutrino number detected by upcoming detectors such as JUNO and Hyper-Kamiokande can reach O(1) for a DWD merging event at ∽1 kpc.

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Section: Gravitational Wavesmentioning

confidence: 99%

Revealing Double White Dwarf Mergers with Multi-messenger Signals

Yang¹,

Tam²,

Yang³

2022

Res. Astron. Astrophys.

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“…We use LEGWORK 2 (Wagg et al 2021) to determine the detectability of our simulated DWD populations for sources with GW frequencies f GW > 10 −4 Hz. LEGWORK calculates the position-, orientation-, and angle-averaged signal to noise ratio (SNR) for inspiraling GW sources closely following the derivations of Flanagan & Hughes (1998) and using the LISA noise power spectral density (PSD) of Robson et al (2019).…”

Section: Lisa Detectabilitymentioning

confidence: 99%

Applying the metallicity-dependent binary fraction to double white dwarf formation: Implications for LISA

Thiele¹,

Breivik²,

Sanderson³

2021

Preprint

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Short-period double white dwarf (DWD) binaries will be the most prolific source of gravitational waves (GWs) for the Laser Interferometer Space Antenna (LISA). Not only will tens of thousands of DWDs be individually resolved, but DWDs with GW frequencies below ∼ 1 mHz will be the dominant contributor to a stochastic foreground caused by confusion from overlapping GW signals, limiting the detectability of individual sources of all kinds. Population modeling of Galactic DWDs typically assumes a standard binary fraction of 50%. However, recent observations have shown that the binary fraction of close (P orb ≤ 10 4 days) solar-type stars exhibits a strong anti-correlation with metallicity. In this study we perform the first simulation of the Galactic DWD population observable by LISA which incorporates an empirically-derived metallicity-dependent binary fraction. We simulate DWDs using the binary population synthesis suite COSMIC and incorporate a metallicity-dependent star formation history to create a Galactic population of short-period DWDs. We compare two models: one which assumes a metallicity-dependent binary fraction, and one with a binary fraction of 50%. We find that while metallicity impacts the evolution and intrinsic properties of our simulated DWD progenitor binaries, the LISA-resolvable populations of the two models remain roughly indistinguishable. However, the size of the total Galactic DWD population orbiting in the LISA frequency band is reduced by more than half when accounting for a metallicity-dependent binary fraction. This effect serves to lower the confusion foreground, effectively increasing the sensitivity for detecting all types of low-frequency LISA sources. We repeat our analysis for three different assumptions for Roche-lobe overflow interactions and find the population reduction to be robust when a metallicity-dependent binary fraction is assumed.

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LEGWORK: A python package for computing the evolution and detectability of stellar-origin gravitational-wave sources with space-based detectors

Cited by 2 publications

References 47 publications

Revealing Double White Dwarf Mergers with Multi-messenger Signals

Revealing Double White Dwarf Mergers with Multi-messenger Signals

Applying the metallicity-dependent binary fraction to double white dwarf formation: Implications for LISA

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