Whether the stellar initial mass function (IMF) is universal or is instead sensitive to
environmental conditions is of critical importance: The IMF influences most observable …

The discovery of large numbers of young low-mass stars and brown dwarfs over the past
decade has made it possible to investigate star formation and early evolution in a previously …

We present final Spitzer trigonometric parallaxes for 361 L, T, and Y dwarfs. We combine
these with prior studies to build a list of 525 known L, T, and Y dwarfs within 20 pc of the …

Planet formation theories predict that some planets may be ejected from their parent systems
as result of dynamical interactions and other processes,,. Unbound planets can also be …

The current knowledge on the stellar IMF is documented. It is usually described as being
invariant, but evidence to the contrary has emerged: it appears to become top-heavy when …

We present new evolution sequences for very low mass stars, brown dwarfs, and giant
planets and use them to explore a variety of influences on the evolution of these objects …

The supermassive black hole at the center of the Milky Way plays host to a massive, young
cluster that may have formed in one of the most inhospitable environments in the Galaxy. We …

We present the discovery of seven ultracool brown dwarfs identified with the Wide-field
Infrared Survey Explorer (WISE). Near-infrared spectroscopy reveals deep absorption bands …

We present the full results of our decade-long astrometric monitoring programs targeting 31
ultracool binaries with component spectral types M7–T5. Joint analysis of resolved imaging …

We present a new volume-limited sample of L0–T8 dwarfs out to 25 pc defined entirely by
parallaxes, using our recent measurements from UKIRT/WFCAM along with Gaia DR2 and …