Image Details
Caption: Figure 2.
Left panel: histogram of MOCAdb spectral types for known confirmed and candidate ultracool dwarfs. Right panel: WISE W2 magnitudes as a function of spectral types for known confirmed and candidate ultracool dwarfs. Known UCD candidates are concentrated at early L spectral types and magnitudes brighter than W2≈15 because they were mostly uncovered using the individual-epoch detections in the WISE mission (which reaches a 5σ depth of 15.5 in W2 band; E. L. Wright et al. 2010), which samples a much larger volume in space for warmer and intrinsically brighter early-L dwarfs. See Section 3 for more details.
© 2026. The Author(s). Published by the American Astronomical Society.