TY - JOUR

T1 - The Role of Core-collapse Physics in the Observability of Black Hole Neutron Star Mergers as Multimessenger Sources

AU - Roman-Garza, Jaime

AU - Bavera, Simone S.

AU - Fragos, Tassos

AU - Zapartas, Emmanouil

AU - Misra, Devina

AU - Andrews, Jeff

AU - Coughlin, Scotty

AU - Dotter, Aaron

AU - Kovlakas, Konstantinos

AU - Serra, Juan Gabriel

AU - Qin, Ying

AU - Rocha, Kyle A.

AU - Tran, Nam Hai

PY - 2021/5/6

Y1 - 2021/5/6

N2 - Recent 1D core-collapse simulations indicate a nonmonotonicity of the explodability of massive stars with respect to their precollapse core masses, which is in contrast to commonly used prescriptions. In this work, we explore the implications of these results on the formation of coalescing black hole (BH)-neutron star (NS) binaries. Furthermore, we investigate the effects of natal kicks and the NS's radius on the synthesis of such systems and potential electromagnetic counterparts (EMCs) linked to them. Models based on 1D core-collapse simulations result in a BH-NS merger detection rate ( similar to 2.3 yr(-1)), 5-10 times larger than the predictions of "standard" prescriptions. This is primarily due to the formation of low-mass BHs via direct collapse, and hence no natal kicks, favored by the 1D simulations. The fraction of observed systems that will produce an EMC, with the supernova engine from 1D simulations, ranges from 2% to 25%, depending on the NS equation of state. Notably, in most merging systems with EMCs, the NS is the first-born compact object, as long as the NS's radius is less than or similar to 12 km. Furthermore, models with negligible kicks for low-mass BHs increase the detection rate of GW190426_152155-like events to similar to 0.6 yr(-1), with an associated probability of EMC

AB - Recent 1D core-collapse simulations indicate a nonmonotonicity of the explodability of massive stars with respect to their precollapse core masses, which is in contrast to commonly used prescriptions. In this work, we explore the implications of these results on the formation of coalescing black hole (BH)-neutron star (NS) binaries. Furthermore, we investigate the effects of natal kicks and the NS's radius on the synthesis of such systems and potential electromagnetic counterparts (EMCs) linked to them. Models based on 1D core-collapse simulations result in a BH-NS merger detection rate ( similar to 2.3 yr(-1)), 5-10 times larger than the predictions of "standard" prescriptions. This is primarily due to the formation of low-mass BHs via direct collapse, and hence no natal kicks, favored by the 1D simulations. The fraction of observed systems that will produce an EMC, with the supernova engine from 1D simulations, ranges from 2% to 25%, depending on the NS equation of state. Notably, in most merging systems with EMCs, the NS is the first-born compact object, as long as the NS's radius is less than or similar to 12 km. Furthermore, models with negligible kicks for low-mass BHs increase the detection rate of GW190426_152155-like events to similar to 0.6 yr(-1), with an associated probability of EMC

KW - COMPACT OBJECT FORMATION

KW - PAIR-INSTABILITY SUPERNOVAE

KW - X-RAY BINARIES

KW - MASS-TRANSFER

KW - COMMON-ENVELOPE

KW - CONVECTIVE BOUNDARIES

KW - GRAVITATIONAL-WAVES

KW - NATAL KICKS

KW - EVOLUTION

KW - PROGENITORS

U2 - 10.3847/2041-8213/abf42c

DO - 10.3847/2041-8213/abf42c

M3 - Letter

VL - 912

JO - The Astrophysical Journal Letters

JF - The Astrophysical Journal Letters

SN - 2041-8205

IS - 2

M1 - 23

ER -