The quest for quiet or dormant black holes has been ongoing since several decades.
Ellipsoidal variables possibly indicate the existence of a very high-mass invisible companion …

The recent discovery of an unambiguous quiescent black hole (BH) and main-sequence O
star companion in VFTS 243 opens the door to new constraints on theoretical stellar …

The systematic properties are largely unknown for the black hole X-ray binary Swift
J151857. 0–572147 newly discovered in the 2024 outburst. The nature of a black hole can …

Among massive stars, binary interaction is the rule rather than the exception. The closest
binaries, those with periods of less than about 10 days, undergo mass transfer during core …

Context. HR 6819 is the first post-mass transfer binary system composed of a classical Be
star and a bloated pre-subdwarf stripped star directly confirmed by interferometry. While the …

Binary systems containing a compact object may exhibit periodic brightening episodes due
to gravitational lensing as the compact object transits the companion star. Such" self …

Compact object binaries (a black hole or a neutron star orbiting a non-degenerate stellar
companion) are key to our understanding of late massive star evolution, in addition to being …

Compact object binaries (a black hole or a neutron star orbiting a non-degenerate stellar
companion) are key to our understanding of late massive star evolution, in addition to being …

Recently, HR 6819 was proposed to host the closest black hole to Earth in an inner binary,
and an outer, tertiary Be star that formed according to the single-star channel. This makes …

Compact object binaries (a black hole or a neutron star orbiting a non-degenerate stellar
companion) are key to our understanding of late massive star evolution, in addition to being …