Discovery of an L4$\beta$ Candidate Member of Argus in the Planetary Mass Regime: WISE J231921.92+764544.4

Philip J. Castro, John E. Gizis

We present the discovery of a young L dwarf, WISE J231921.92+764544.4, identified by comparing the Wide-field Infrared Survey Explorer (WISE) All-Sky Catalog to the Two Micron All…