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An electron-capture supernova (ECSN) is a core-collapse supernova (CCSN)explosion of a super-asymptotic giant branch (SAGB) star with a main-sequencemass $M_{\rm ms}\sim7-9.5M_\odot$. The explosion takes place in accordance withcore bounce and subsequent neutrino heating and is a unique examplesuccessfully produced by first-principle simulations. This allows us to derivea first self-consistent multicolor light curves of a CCSN. Adopting theexplosion properties derived by the first-principle simulation, i.e., the lowexplosion energy of $1.5\times10^{50}$ erg and the small $^{56}$Ni mass of$2.5\times10^{-3}M_\odot$, we perform a multigroup radiation hydrodynamicscalculation of ECSNe and present multicolor light curves of ECSNe of SAGB starswith various envelope mass and hydrogen abundance. We demonstrate that a shockbreakout has peak luminosity of $L\sim2\times10^{44}$ erg/s and can evaporatecircumstellar dust up to $R\sim10^{17}$ cm for a case of carbon dust, thatplateau luminosity and plateau duration of ECSNe are $L\sim10^{42}$ erg/s and$t\sim60-100$ days, respectively, and that a plateau is followed by a tail witha luminosity drop by $\sim4$ mag. The ECSN shows a bright and short plateauthat is as bright as typical Type II plateau supernovae, and a faint tail thatmight be influenced by spin-down luminosity of a newborn pulsar. Furthermore,the theoretical models are compared with ECSN candidates: SN 1054 and SN 2008S.We find that SN 1054 shares the characteristics of the ECSNe. For SN 2008S, wefind that its faint plateau requires an ECSN model with a significantly lowexplosion energy of $E\sim10^{48}$ erg.

Supernova Explosions of Super-Asymptotic Giant Branch Stars: Multicolor Light Curves of Electron-Capture Supernovae