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@@ -863,7 +867,7 @@ <h1><strong>Grichener et al. 2023</strong><h1>
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We perform population synthesis of massive binaries to study the mergers ofneutron stars (NSs) and black holes (BHs) with the cores of their giantsecondaries during common envelope evolution (CEE). We use different values ofthe efficiency parameter $\alpha_{\rm CE}$ in the framework of the energyformalism for traditional CEE ($\alpha_{\rm CE} \leq 1$) and includingadditional energy sources to unbind the envelope ($\alpha_{\rm CE} > 1$). Weconstrain the possible values of $\alpha_{\rm CE}$ by comparing the results ofour simulations with local rate densities of binary compact object mergers asinferred from gravitational waves observations. We find two primaryevolutionary pathways of binary systems that result in NS-core mergers, whileonly one of them can also lead to the merger of a BH with the core of the giantstar. We explore the zero age main sequence (ZAMS) statistical properties ofsystems that result in NS/BH-core mergers and find that the two evolutionarychannels correspond to a bimodal distribution of orbital separations. Weestimate the percentage of the mergers' event rates relative to core collapsesupernovae (CCSNe). We include the effect of mass accreted by the NS/BH duringCEE in a separate set of simulations and find it does not affect the mergers'event rates.
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We perform population synthesis of massive binaries to study the mergers of neutron stars (NSs) and black holes (BHs) with the cores of their giant secondaries during common envelope evolution (CEE). We use different values of the efficiency parameter $\alpha_{\rm CE}$ in the framework of the energy formalism for traditional CEE ($\alpha_{\rm CE} \leq 1$) and including additional energy sources to unbind the envelope ($\alpha_{\rm CE} > 1$). We constrain the possible values of $\alpha_{\rm CE}$ by comparing the results of our simulations with local rate densities of binary compact object mergers as inferred from gravitational waves observations. We find two primary evolutionary pathways of binary systems that result in NS-core mergers, while only one of them can also lead to the merger of a BH with the core of the giant star. We explore the zero age main sequence (ZAMS) statistical properties ofsystems that result in NS/BH-core mergers and find that the two evolutionary channels correspond to a bimodal distribution of orbital separations. We estimate the percentage of the mergers' event rates relative to core collapses upernovae (CCSNe). We include the effect of mass accreted by the NS/BH duringCEE in a separate set of simulations and find it does not affect the mergers event rates.
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