Projects per year
Abstract
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 −1.5 M⊙ and 1.9 +0.3 −0.2 M⊙, whereas the source of GW200115 has component masses 5.7 +1.8 −2.1 M⊙ and 1.5 +0.7 −0.3 M⊙ (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 −33 Gpc−3yr−1 when assuming GW200105 and GW200115 are representative of the NSBH population, or 130 +112 −69 Gpc−3yr−1 under the assumption of a broader distribution of component masses.
Original language | English |
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Article number | L5 |
Number of pages | 24 |
Journal | Astrophysical Journal Letters |
Volume | 915 |
Issue number | 1 |
DOIs | |
Publication status | Published - 29 Jun 2021 |
Keywords
- astro-ph.HE
- UKRI
- STFC
- GW_HIGHLIGHT
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Data availability statement for 'Observation of gravitational waves from two neutron star-black hole coalescences'.
Davies, G. (Creator), Edy, O. (Creator), Harry, I. (Creator), Keitel, D. (Creator), Lundgren, A. (Creator), Macas, R. (Creator), Mcisaac, C. (Creator), Mozzon, S. (Creator), Nuttall, L. (Creator) & Williamson, A. (Creator), IOP Publishing, 29 Jun 2021
Dataset: Data Availability Statement
Projects
- 1 Finished
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Enabling rapid observation of compact binary mergers with a network of gravitational-wave observatories
Harry, I. (PI)
Science and Technology Facilities Council
1/04/20 → 30/09/21
Project: Research