W1055+5443 is a Y-type brown dwarf, observations find

Using the Keck II telescope, astronomers have performed near-infrared spectroscopic observations of a nearby brown dwarf known as CWISE J105512.11+544328.3, or W1055+5443 for short. Results of the observational campaign, presented October 14 on the pre-print server arXiv, reveal that this object belongs to the rare class of ultracool brown dwarfs, dubbed Y dwarfs.