Image Details
Caption: Figure 9.
The four common failure modes resulting in poor-quality SPIFF spectrophotometry. Upper left: an unresolved contaminating background star dominates the signal (occurred for 8.6% of known ultracool dwarfs). Upper right: a false-positive brown dwarf corresponding to a reddened background star (occurred for 0.3% of known ultracool dwarfs). Lower left: an ambiguous spectrum due to low S/N data (occurred for 0.3% of known ultracool dwarfs with W2 ≤ 14.0 mag). Lower right: two or more resolved but closely separating sources causing confusion, where the PSF model can converge to either source depending on the epoch (occurred for 2.6% of known ultracool dwarfs). See Section 4.4 for more details.
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