The hierarchical triple-body approximation has useful applications to a variety of systems
from planetary and stellar scales to supermassive black holes. In this approximation, the …

Context. Hierarchical triple stars are ideal laboratories for studying the interplay between
orbital dynamics and stellar evolution. Both mass loss from stellar winds and strong …

We compile observations of early-type binaries identified via spectroscopy, eclipses, long-
baseline interferometry, adaptive optics, common proper motion, etc. Each observational …

The environment near supermassive black holes (SMBHs) in galactic nuclei contains a large
number of stars and compact objects. A fraction of these are likely to be members of …

Because the majority of massive stars are born as members of close binary systems,
populations of massive main-sequence stars contain stellar mergers and products of binary …

Hierarchical triple-star systems are expected to form frequently via close binary–binary
encounters in the dense cores of globular clusters (GCs). In a sufficiently inclined triple …

The secular approximation for the evolution of hierarchical triple configurations has proven
to be very useful in many astrophysical contexts, from planetary to triple-star systems. In this …

For stars with unresolved companions, motions of the centre of light and that of mass
decouple, causing a single-source astrometric model to perform poorly. We show that such …

White dwarf–white dwarf (WD–WD) and neutron star–neutron star (NS–NS) mergers may
produce Type Ia supernovae and gamma-ray bursts (GRBs), respectively. A general …

Field stars are frequently formed in pairs, and many of these binaries are part of triples or
even higher-order systems. Even though, the principles of single stellar evolution and binary …