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Analysis of the subsolar-mass black hole candidate SSM200308 from the second part of the third observing run of Advanced LIGO-Virgo

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arxiv 2311.16085 v2 pith:Y6NZFHUS submitted 2023-11-27 gr-qc astro-ph.CO

Marine Prunier , Gonzalo Morrás , José Francisco Nuño Siles , Sebastien Clesse , Juan García-Bellido , Ester Ruiz Morales This is my paper · ORCID
classification gr-qcastro-ph.CO
keywords candidatesignalbinaryblackcoalescencecompactcomponenthole
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abstract

A follow-up of a subsolar black hole candidate identified in the second part of the third observing run of the LIGO-Virgo-KAGRA collaboration is carried out. With a search signal-to-noise ratio of $8.90$ and a false-alarm rate of 1 per 5 years, close to the usual thresholds for claiming a gravitational-wave event, we cannot exclude a noise origin. A complete Bayesian parameter estimation of this candidate, denoted SSM200308, reveals that if the signal originates from a compact binary coalescence, the component masses are $m_1= 0.62^{+0.46}_{-0.20} M_{\odot}$ and $m_2 = 0.27^{+0.12}_{-0.10} M_{\odot}$ (90% credible intervals) with at least one component being firmly subsolar, below the minimum mass of a neutron star. This discards the hypothesis that the signal comes from a standard binary neutron star. The signal coherence test between the two LIGO detectors brings support to a compact object coalescence origin.

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Cited by 3 Pith papers

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