We present a sample of 146 high-redshift (z>7. 5) galaxies from the CANUCS/Technicolor surveys, showcasing photometry in every wide- and medium-band NIRCam filter in addition to ancillary HST data sampling 0. 4-5 m (22 JWST bands out of 29 bands total). Additionally, 48 (33\%) galaxies in our sample meet criteria to be classified as extreme emission line galaxies, 15 (10\%) of which are completely missed by typical dropout selections due to faint UV emission. By fitting the SEDs covering the rest-frame UV to optical at z > 7. 5, we investigate the dust obscuration properties, giving an unbiased view of dust buildup in high-redshift galaxies free from spectroscopic follow-up selection effects. Dust attenuation correlates with stellar mass, but more strongly with star formation rate. We find typical galaxies at z>7. 5 have 25 \% of their star formation obscured. However, since galaxies with higher star formation rates suffer more attenuation, 50 \% of the total star formation rate density at 7. 5 15, implying that epoch as when dust first forms in bright galaxies.
Martis et al. (2025) studied this question.