SN 2024aecx: a fast-evolving Type IIb supernova with a prominent shock-cooling peak

Qiang Xi, Ning-Chen Sun, David Aguado +36

SN 2024aecx is a nearby ($\sim$11 Mpc) Type IIb SN discovered within $\sim$1 d after explosion. In this paper we report high-cadence photometric (typically 0.5$\sim$1 day) and spec…