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Test for LISA foreground Gaussianity and stationarity: galactic white-dwarf binaries

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arxiv 2410.08263 v2 pith:W5GC4SXR submitted 2024-10-10 astro-ph.HE astro-ph.IMgr-qc

Riccardo Buscicchio , Antoine Klein , Valeriya Korol , Francesco Di Renzo , Christopher J. Moore , Davide Gerosa , Alessandro Carzaniga This is my paper · ORCID
classification astro-ph.HEastro-ph.IMgr-qc
keywords foregroundlisagaussianitywillbinarydatadetectorsdwarfs
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Upcoming space-based gravitational-wave detectors will be sensitive to millions and resolve tens of thousands of stellar-mass binary systems at mHz frequencies. The vast majority of these will be double white dwarfs in our Galaxy. The greatest part will remain unresolved, forming an incoherent stochastic foreground signal. Using state-of-the-art Galactic models for the formation and evolution of binary white dwarfs and accurate LISA simulated signals, we introduce a test for foreground Gaussianity and stationarity, building on methods available for ground-based detectors. We explain the observed non-stationarity with a new analytical modulation induced by the LISA constellation motion and the intrinsic anisotropy of the source distribution. By demodulating the foreground signal, we reveal a deviation from Gaussianity in the 2-10 mHz frequency band. Our finding is crucial to design faithful data models: the proposed method serves as a diagnostic and estimation tool to flag and model deviations, respectively. Neglecting them would introduce systematic biases on individual sources and astrophysical foregrounds parameter estimation, ultimately leading to inaccurate interpretation of the LISA data.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Residual Galactic binary foreground in LISA stochastic gravitational-wave background inference: source power concentration and spectral degeneracy

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    Residual Galactic binaries left after catalog-matched recovery inflate the LISA flat-SGWB amplitude uncertainty by 13.6% when their amplitude is marginalized, and would bias it by ~120σ if omitted.

  2. Angular Resolution of a Bayesian Search for Anisotropic Stochastic Gravitational Wave Backgrounds with LISA

    gr-qc 2024-12 conditional novelty 6.0 of 10

    For loud anisotropic gravitational wave backgrounds in LISA, Bayesian spherical harmonic searches reach their best angular resolution at ℓmax=16, limited by computation rather than by signal properties.

  3. From eccentric binaries to nonstationary gravitational wave backgrounds

    gr-qc 2024-12 conditional novelty 6.0 of 10

    Time-dependent fluctuations in the gravitational wave background can be large and detectable when the background is dominated by massive, eccentric supermassive black hole binaries or by a single eccentric binary with...

  4. Constraining the Galactic Structure using Time Domain Gravitational Wave Signal from Double White Dwarfs Detected by Space Gravitational Wave Detectors

    astro-ph.GA 2024-11 conditional novelty 4.0 of 10

    A new time-domain method using the annual modulation of the unresolved and resolved double white dwarf gravitational wave foreground constrains the Galactic thin disk scale height and length and bulge scale radius to ...

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