Extended Data Fig. 10: Near-infrared spectra of WD0032–317.
Binned flux-calibrated Gemini South’s FLAMINGOS-2 near-infrared spectra of WD0032–317 (the unbinned spectra appear as semi-transparent lines), taken near orbital phases 0 (grey) and 0.35 (orange). The red ticks mark the hydrogen Brackett series in the reference frame of the companion. The Brackett 10 → 4 line is possibly seen in emission at ≈ 17,357 Å in the phase 0.35 spectrum. The greyed-out regions mark bands of high telluric atmospheric absorption. The bottom panel shows the phase-0 spectrum along with the theoretical models from Fig. 2, scaled to reflect their contribution at orbital phase 0: the white-dwarf model is plotted in dashed light blue, the brown-dwarf model is plotted in solid purple (multiplied by a factor of 20 for visual clarity), the black-body model is plotted in dotted orange, and the composite model is plotted in solid red.
