2021
DOI: 10.3847/2041-8213/ac225a
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Impact of Natal Kicks on Merger Rates and Spin–Orbit Misalignments of Black Hole–Neutron Star Mergers

Abstract: Neutron stars are born out of core-collapse supernovae, and they are imparted natal kicks at birth as a consequence of asymmetric ejection of matter and possibly neutrinos. Unless the force resulting from the kicks is exerted exactly at their center, it will also cause the neutron star to rotate. In this paper, we discuss the possibility that neutron stars may receive off-center natal kicks at birth, which imprint a natal rotation. In this scenario, the observed pulsar spin and transverse velocity in the Galax… Show more

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Cited by 24 publications
(14 citation statements)
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“…The observational data for GW200115 shows possible evidence for significant spin-orbit misalignment (Abbott et al 2021). Several authors have argued that high natal kicks would be necessary to mis-align the spin to such a high degree (Fragione et al 2021;Gompertz et al 2021;Zhu 2021). However, Broekgaarden & Berger (2021) showed smaller supernova kicks provide a better match with observations once the rates of all compact object mergers are taken into account.…”
Section: Discussionmentioning
confidence: 91%
“…The observational data for GW200115 shows possible evidence for significant spin-orbit misalignment (Abbott et al 2021). Several authors have argued that high natal kicks would be necessary to mis-align the spin to such a high degree (Fragione et al 2021;Gompertz et al 2021;Zhu 2021). However, Broekgaarden & Berger (2021) showed smaller supernova kicks provide a better match with observations once the rates of all compact object mergers are taken into account.…”
Section: Discussionmentioning
confidence: 91%
“…We also self-consistently keep track of the spin-orbit misalignment (I BH−NS ) produced as a result of natal kicks. For details, see Fragione et al (2021).…”
Section: Methods 21 Binary Population Synthesismentioning
confidence: 99%
“…In this case, we fix σ = 260 km s −1 and α CM = 1 in our population synthesis models; other combinations of σ and α CM lead to qualitatively similar results. Note that we self-consistently account for the cosmological distribution of inclination angles, I BH−NS , (see Fragione et al 2021), which is critical to determine whether a NS directly plunges onto or is tidally disrupted by the BH. We also report in Figure 3 the median mass for the LVK candidate event GW190426, the two confirmed LVK BH-NS mergers GW201005 and GW20015, and the re-analysis by Mandel & Smith (2021) of GW200115.…”
Section: Distribution Of Bh-ns Mergers With Electromagnetic Counterpartmentioning
confidence: 99%
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“…Using metallicity-specific star formation rate density prescriptions (Broekgaarden et al 2021b) in an isolated binary evolution scenario, Broekgaarden & Berger (2021) concluded that the observed two NS-BHs can be explained from this formation channel, and gave some constraint on the common envelope efficiency and the natal kick velocities of supernovae by treating BH-BHs and NS-NSs simultaneously. Taking the spin direction of BH of GW200115 into account, Fragione et al (2021) discussed this NS-BH in the evolution of isolated massive binary stars and effects 2021) have predicted that 16-40% events of short-duration gamma-ray burst will be hostless. Antoniadis et al (2021) focused on highly unequal mass components of BH-BHs and NS-BHs, and showed that the landscape of core-collapse supernovae would cause the unequalness.…”
Section: Introductionmentioning
confidence: 99%