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LIGO Document P2000357-v9
- We report the observation of gravitational waves from two compact binary coalescences in LIGO's and Virgo's third observing run with properties consistent with neutron star--black hole (NSBH) binaries. The two events are named GW200105_162426 and GW200115_042309, abbreviated as GW200105 and GW200115; the first was observed by LIGO Livingston and Virgo, and the second by all three LIGO-Virgo detectors. The source of GW200105 has component masses 8.9+1.2−1.5M⊙ and 1.9+0.3−0.2M⊙, whereas the source of GW200115 has component masses 5.7+1.8−2.1M⊙ and 1.5+0.7−0.3M⊙ (all measurements quoted at the 90% credible level). The probability that the secondary's mass is below the maximal mass of a neutron star is 89%-96% and 87%-98%, respectively, for GW200105 and GW200115, with the ranges arising from different astrophysical assumptions. The source luminosity distances are 280+110−110 Mpc and 300+150−100 Mpc, respectively. The magnitude of the primary spin of GW200105 is less than 0.23 at the 90% credible level, and its orientation is unconstrained. For GW200115, the primary spin has a negative spin projection onto the orbital angular momentum at 88% probability. We are unable to constrain spin or tidal deformation of the secondary component for either event. We infer a NSBH merger rate density of 45+75−33Gpc−3yr−1 when assuming GW200105 and GW200115 are representative of the NSBH population, or 130+112−69Gpc−3yr−1 under the assumption of a broader distribution of component masses.
- Version uploaded to arXiv, identical to the one in ApJL, except for typesetting.
- Published in ApJ Letters vol. 915 pg. L5.
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