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Prospects for detecting gravitational waves from eccentric subsolar mass compact binaries

Wang, Y.-F., & Nitz, A. H. (2021). Prospects for detecting gravitational waves from eccentric subsolar mass compact binaries. The Astrophysical Journal, 912(1): 53. doi:10.3847/1538-4357/abe939.

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Creators:
Wang, Yi-Fan1, Author
Nitz, Alexander H.1, 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: Sub-solar mass black hole binaries, due to their light mass, would have to be primordial in origin instead of the result of stellar evolution. Soon after formation in the early Universe, primordial black holes can form binaries after decoupling from the cosmic expansion. Alternatively, primordial black holes as dark matter could also form binaries in the late Universe due to dynamical encounters and gravitational-wave braking. A significant feature for this channel is the possibility that some sources retain non-zero eccentricity in the LIGO/Virgo band. Assuming all dark matter is primordial black holes with a delta function mass distribution, $1M_\odot-1M_\odot$ binaries formed in this late Universe channel can be detected by Advanced LIGO and Virgo with at their design sensitivities with a rate of $\mathcal{O}(1)$/year, where $12\%(3\%)$ events have eccentricity at gravitational-wave frequency 10 Hz, $e^\mathrm{10Hz}\geq0.01(0.1)$, and non-detection can constrain the binary formation rate within this model. Third generation detectors would be expected to detect sub-solar mass eccentric binaries as light as $0.01 M_\odot$ within this channel, if they account for the majority of the dark matter. Furthermore, we use simulated gravitational-wave data to study the ability to search for eccentric gravitational-wave signals using quasi-circular waveform template bank with Advanced LIGO design sensitivity. Assuming binaries with a delta function mass of $0.1(1)M_\odot$ and the eccentricity distribution derived from this late Universe formation channel, for a match-filtering targeted search, $41\%(6\%)$ of the signals would be missed compared to ideal detection rate due to the mismatch in the gravitational-wave signal from eccentricity.

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Dates: 2021-01-282021-02-082021
Publication Status: Published in print
Pages: added references, submitted to ApJ. 10 pages, 7 figures. Code and data associated with this article at https://github.com/gwastro/prospects-subsolarmass-ecc
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Identifiers: arXiv: 2101.12269
DOI: 10.3847/1538-4357/abe939
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 912 (1) Sequence Number: 53 Start / End Page: - Identifier: -