The IRTF/SpeX near-infrared spectra of the companion COCONUTS-1B (black), as well as the T2–T5 spectral standards (brown; Burgasser et al. 2006a; Liu et al. 2010). The spectrum of COCONUTS-1B is flux-calibrated using its J_MKO magnitude from UHS (Section 5.3.2), and the other spectral standards are normalized by their peak fluxes. We thereby derive a visual type of T4 ± 0.5 for COCONUTS-1B, although its Y-band emission is relatively suppressed compared to the T4 standard.

(The data used to create this figure are available.)