Stellar multiplicity is among the oldest and richest problems in astrophysics. Binary stars are
a cornerstone of stellar mass and radius measurements that underpin modern stellar …

We present the first discoveries of the double-lined double white dwarf (DBL) survey that
targets overluminous sources with respect to the canonical white dwarf cooling sequence …

Double detonations of sub-Chandrasekhar-mass white dwarfs (WDs) in unstably mass-
transferring double WD binaries have become one of the leading contenders to explain most …

Type Ia supernovae arise from thermonuclear explosions of white dwarfs accreting from a
binary companion. Following the explosion, the surviving donor star leaves at roughly its …

This review highlights the role of the Gaia space mission in transforming white dwarf
research. These stellar remnants constitute 5%–7% of the local stellar population in volume …

We perform nonlocal thermodynamic equilibrium (NLTE) model atmosphere analyses of the
three hottest hypervelocity stars (space velocities between≈ 1500–2800 km s− 1) known to …

The hot white dwarf (WD) J0927− 6335 (Gaia DR3 5250394728194220800 with an effective
temperature of T eff= 60 000 K and a surface gravity of logg= 7) was detected as the fastest …

We consider a scenario in which Sgr A* is in a massive black hole binary (MBHB) with an as-
of-yet undetected supermassive or intermediate-mass black hole companion. Dynamical …

We present observations of SN 2022joj, a peculiar Type Ia supernova discovered by the
Zwicky Transient Facility. SN 2022joj exhibits an unusually red g ZTF− r ZTF color at early …

We present an analysis of new and archival data to the 20.506 minute LISA verification
binary J052610. 42+ 593445.32 (J0526+ 5934). Our joint spectroscopic and photometric …