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We investigate the expected rates and bolometric light-curve properties ofstripped-envelope electron-capture supernovae (ECSNe) using stellar models fromthe Binary Population and Spectral Synthesis (BPASS) code. We find that 0.8 percent (Z = 0.020) and 1.2 per cent (Z = 0.004) of core-collapse supernovae arestripped-envelope ECSNe. Their typical ejecta masses are estimated to be about0.3 Msun (Z = 0.020) and 0.6 Msun (Z = 0.004). Assuming ECSN explosionproperties from numerical explosion simulations, an explosion energy of 1.5e50erg and a 56Ni mass of 2.5e-3 Msun, we find that stripped-envelope ECSNe have atypical rise time of around 7 days (Z = 0.020) or 13 days (Z = 0.004) and peakluminosity of around 1e41 erg/s (-13.8 mag, Z = 0.020) or 7e40 erg/s (-13.4mag, Z = 0.004). Their typical ejecta velocities are around 7000 km/s (Z =0.020) or 5000 km/s (Z = 0.004). Thus, stripped-envelope ECSNe are observed asrapidly-evolving faint transients with relatively small velocities. SN2008ha-like supernovae, which are the faintest kind of SN 2002cx-like (a.k.a.Type Iax) supernovae, may be related to stripped-envelope ECSNe.

Rapidly evolving faint transients from stripped-envelope electron-capture supernovae