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Search for gravitational waves from the coalescence of sub-solar mass and eccentric compact binaries

Nitz, A. H., & Wang, Y.-F. (2021). Search for gravitational waves from the coalescence of sub-solar mass and eccentric compact binaries. The Astrophysical Journal, 915(1): 54. doi:10.3847/1538-4357/ac01d9.

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Creators:
Nitz, Alexander H.1, Author
Wang, Yi-Fan1, Author
Affiliations:
1Observational Relativity and Cosmology, AEI-Hannover, MPI for Gravitational Physics, Max Planck Society, ou_24011

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Free keywords: Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE,General Relativity and Quantum Cosmology, gr-qc
Abstract: We present the first search for gravitational waves from sub-solar mass compact-binary mergers which allows for non-negligible orbital eccentricity. Sub-solar mass black holes are a signature of primordial origin black holes, which may be a component of dark matter. To produce binary coalescences, primordial black holes may form close binaries either in the early universe or more recently through dynamical interactions. A signature of dynamical formation would be the observation of non-circularized orbits. We search for black hole mergers where the primary mass is $0.1-7 M_{\odot}$ and the secondary mass is $0.1-1 M_{\odot}$. We allow for eccentricity up to $\sim0.3$ at a dominant-mode gravitational-wave frequency of 10 Hz for binaries with at least one component with mass $>0.5 M_{\odot}$. We find no convincing candidates in the public LIGO data. The two most promising candidates have a false alarm rate of 1 per 3 and 4 years, respectively, which combined is only a $\sim 2.4\sigma$ deviation from the expected Poisson rate. Given the marginal statistical significance, we place upper limits on the rate of sub-solar mass mergers under the assumption of a null observation and compare how these limits may inform the possible dark matter contribution.

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Dates: 2021-02-012021-02-022021
Publication Status: Published in print
Pages: 7 pages, 4 figures, 1 table. Supplementary material at https://github.com/gwastro/subsolar-ecc-primordial-search, v2 fixes minor typos
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Identifiers: arXiv: 2102.00868
DOI: 10.3847/1538-4357/ac01d9
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 915 (1) Sequence Number: 54 Start / End Page: - Identifier: -