Field Brown Dwarfs
Brown dwarfs are objects with masses lying between those of stars and
planets which lack the internal temperature to fuse Hydrogen. Hence
they fade and cool with time. I use proper motion (stars' motions
across the sky over several years) surveys based on datasets such as
PanSTARRS and
UKIDSS surveys and numerical simulations to estimate the mass function and birthrate of these objects, giving clues to how these objects formed.