SN 2023zaw: An Ultrastripped, Nickel-poor Supernova from a Low-mass Progenitor
SN 2023zaw: An Ultrastripped, Nickel-poor Supernova from a Low-mass Progenitor
Abstract We present SN 2023zaw—a subluminous ( M r = −16.7 mag) and rapidly evolving supernova ( t 1/2, r = 4.9 days), with the lowest nickel mass (≈0.002 M ⊙ ) measured among all stripped-envelope supernovae discovered to date. The photospheric spectra are dominated by broad He i and …