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Compact Binary Mergers
Numerous compact objects are bound inside binary systems, some of these, so-called compact binary systems are either binary neutron star systems (often also called double neutron star systems), black hole - neutron star systems, and binary black hole systems. On top of these, well-established scenarios, there is also the possibility for the existence of exotic compact objects that also could be bound inside compact binaries. In the following, we will provide some additional information about
Black Hole - Neutron Star Systems
Similar to binary neutron star systems, a neutron star can also be on a bound orbits with a black hole. Such black hole - neutron star systems have been observed for the first time in January 2020 with GW200105 and GW200115. Given the presence of matter the collision of a black hole neutron star system could in principle also be connected with electromagnetic counterparts, however, we have not been able to confidentially detect a short gamma-ray burst or a kilonova created from a black hole - neutron star collision.
