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We present the detection of a broad 8 $\mu$m feature in newly formed dustaround the carbon-rich Wolf-Rayet (WC) binary WR 125 from N-band low-resolution(NL; R$\sim$250) spectroscopy between 7.3-13.6 $\mu$m and N-band (11.7 $\mu$m)and Q-band (18.8 $\mu$m) imaging with Subaru/COMICS in 2019 October. WR 125 isa colliding wind binary (${\rm WC7+O9}$) that exhibited renewed dust formationstarting in 2018, $\sim$28 years after its first dust formation episode hadbeen observed. We also compare our infrared photometry with historicalobservations and revise the dust-formation period of WR 125 to 28.1 years.Archival infrared spectra of five dusty WC stars, WR 48a, WR 98a, WR 104, WR112 and WR 118, obtained with ISO/SWS are reanalyzed and compared with the WR125 spectrum to search for a similar feature. We analyze the dusty WC spectrausing two different extinction curves to investigate the impact of interstellarextinction correction on the presence and/or properties of the 8 $\mu$mfeature. All of the dusty WC spectra dereddened with the two differentextinction curves show a broad feature around 8 $\mu$m (FWHM$\sim$1-2 $\mu$m).We suggest that these 8 $\mu$m features seen in the dusty WC spectra arerelated to the Class C unidentified infrared (UIR) features.

Detection of a broad 8 $\mu$m UIR feature in the mid-infrared spectrum of WR 125 observed with Subaru/COMICS