Image Details
Caption: Figure 4.
Left panel: histogram of high-quality SPHEREx spectrophotometry products presented here. The thick black line represents the current population of ultracool dwarfs with spectral type determinations based on spectroscopy, including the SPIFF library (which is shown independently as a thin gray line), as well as every other spectrometer. A significant fraction of known and newly-discovered ultracool dwarfs with spectral types T5 and earlier have spectrophotometry data products available in the SPIFF library. New spectroscopic confirmations of literature ultracool dwarf candidates are shown with a dashed blue line. New discoveries of confirmed or candidate ultracool dwarfs are shown with red and dotted orange lines, respectively. Right panel: average spectrophotometry S/N as a function of WISE W2 magnitude. Objects with W2 =14 or brighter usually result in high-quality SPHEREx spectrophotometry with an average S/N of 10 or above, when free from background contamination. See Section 4.1 for more details.
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© 2026. The Author(s). Published by the American Astronomical Society.
