Hypervelocity stars (HVSs) travel with such extreme velocities that dynamical ejection via
gravitational interaction with a massive black hole (MBH) is their most likely origin …

We made new estimates of the Galactic escape speed at various Galactocentric radii using
the latest data release of the RAdial Velocity Experiment (RAVE DR4). Compared to …

Both major galaxies in the Local Group (LG) are surrounded by thin planes of mostly co-
orbiting satellite galaxies, the vast polar structure (VPOS) around the Milky Way (MW) and …

We describe our completed spectroscopic survey for unbound hypervelocity stars (HVSs)
ejected from the Milky Way. Three new discoveries bring the total number of unbound late B …

Type Ia and other peculiar supernovae (SNe) are thought to originate from the
thermonuclear explosions of white dwarfs (WDs). Some of the proposed channels involve …

Abstract The SDSS-IV Apache Point Observatory Galactic Evolution Experiment (APOGEE)
survey provides precise chemical abundances of 18 chemical elements for∼ 176,000 red …

We measure proper motions with the Hubble Space Telescope for 16 extreme radial velocity
stars, mostly unbound B stars in the Milky Way halo. Twelve of these stars have proper …

We present the discovery of five new unbound hypervelocity stars (HVSs) in the outer Milky
Way halo. Using a conservative estimate of Galactic escape velocity, our targeted …

We assemble a large sample of 12,784 high-velocity stars with total velocity V GSR≥ 300
km s− 1, selected from RAVE DR5, SDSS DR12, LAMOST DR8, APOGEE DR16, GALAH …

We report the discovery of a high-velocity, very low-mass star or brown dwarf whose
kinematics suggest it is unbound to the Milky Way. CWISE J124909. 08+ 362116.0 was …