The role of recombination during a common-envelope event has been long debated. Many
studies have argued that much of hydrogen recombination energy, which is radiated in …

We present extensive datasets for a class of intermediate-luminosity optical transients
known as luminous red novae. They show double-peaked light curves, with an initial rapid …

Luminous red novae (LRNe) are astrophysical transients associated with the partial ejection
of a binary system's common envelope shortly before its merger. Here we present the results …

The Galactic center is dominated by the gravity of a super-massive black hole (SMBH),
Sagittarius A*, and is suspected to contain a sizable population of binary stars. Such …

We present an observational study of the luminous red nova (LRN) AT 2021biy in the nearby
galaxy NGC 4631. The field of the object was routinely imaged during the pre-eruptive stage …

Recent observations have revealed that the remnants of stellar-coalescence transients are
bipolar. This raises the questions of how these bipolar morphologies arise and what they …

Recent surveys show that wide (> 104 AU) binaries and triples are abundant in the field. We
study the long-term evolution of wide hierarchical triple systems and the role played by the …

Context. White dwarfs (WDs) are important and abundant tools to study the structure and
evolution of the Galactic environment. However, the multiplicity of WD progenitors is …

Stellar mergers are important processes in stellar evolution, dynamics, and transient
science. However, it is difficult to identify merger remnant stars because they cannot easily …

We discuss the central role that dust condensation plays in sha** the observational
appearance of outflows from coalescing binary systems. As binaries begin to coalesce, they …