Circumbinary disks in post common envelope binary systems with compact objects

Compact objects often exist in binary systems with stellar companions. The expansion of the companion can trigger a common envelope evolution (CEE), potentially leading to a circumbinary disk (CBD) around the compact object and the giant's core. Our population synthesis study investigates CBD formation conditions in these systems. We discover that CBDs are most likely in double compact object (DCO) binaries expected to merge within Hubble time. Additionally, we observe that the CBD's interaction with the core and compact object post-CEE reduces DCO merger rates, regardless of binary dynamics. We suggest that including post-CEE CBD models in population synthesis can offer insights into the rates of gravitational-wave progenitors and other transients involving compact objects. Recent studies incorporate hydrodynamical simulation results into our models to evaluate interactions between the binary and the CBD, enhancing our understanding of these complex systems.

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