The LIGO and Virgo detectors have directly observed gravitational waves from mergers of
pairs of stellar-mass black holes, along with a smaller number of mergers involving neutron …

Stellar-mass black holes are the final remnants of stars born with more than 15 solar
masses. Billions are expected to reside in the Local Group, yet only a few are known, mostly …

We describe the discovery of a solar neighborhood (d= 468 pc) binary system with a main-
sequence sunlike star and a massive noninteracting black hole candidate. The spectral …

Context. The quest to detect dormant stellar-mass black holes (BHs) in massive binaries (ie
OB+ BH systems) is challenging; only a few candidates have been claimed to date, all of …

At the end of its life, a very massive star is expected to collapse into a black hole (BH). The
recent detection of an 85 M⊙ BH from the gravitational wave event GW 190521 appears to …

We present the merger rate density of Population III binary black holes (BHs) by means of a
widely used binary population synthesis code BSE with extensions to very massive and …

Context. The intriguing binary LS V+ 22 25 (LB-1) has drawn much attention following claims
of it being a single-lined spectroscopic binary with a 79-day orbit comprising a B-type star …

Context. Massive binaries hosting a black hole (OB+ BH) represent a critical phase in the
production of BH mergers in the context of binary evolution. In spite of this, such systems …

Context. The recent gravitational wave measurements have demonstrated the existence of
stellar mass black hole binaries. It is essential for our understanding of massive star …

Context. HR 6819 was recently proposed to be a triple system consisting of an inner B-type
giant plus black hole (BH) binary with an orbital period of 40 d and an outer Be tertiary. This …