Diversity in hydrogen-rich envelope mass of type II supernovae (I): V-band light curve modeling

We conduct a systematic study on the light curves of type II supernovae (SNe II) to investigate how they are affected by the physical properties of the progenitor and the nature of the explosion. The calculations of pre-supernova evolution, the launch of the explosion, and the light curve are carried out by and . Our study encompasses a wide range of zero-age-main-sequence (ZAMS) masses (10 - 20 M_⊙), wind mass-loss rates (which control the range of hydrogen-rich envelope mass to be 3 - 12 M_⊙), explosion energies (0.1 - 2.5 × 10^51 erg), and ^56Ni masses (0 - 0.15 M_⊙). Our analyses reveal that when the explosion energy is fixed, the light curve is primarily determined by the properties of the hydrogen-rich envelope, despite the large variation in the ZAMS masses. The dependencies of the light-curve characteristics on the envelope mass, radius, and explosion energy are investigated, and we establish the scaling relations connecting these quantities. We further derive a formula that corrects for effects of the ^56Ni heating based on observables. Using the derived equations, we develop a method that can constrain the envelope mass with uncertainty within 1 M_⊙ based on photometry. This method is applied to a large sample of ∼ 100 SNe II, which reveals a considerably broader range of the envelope masses estimated from observables as compared to those predicted by single star models evolving with standard stellar wind; this finding indicates that a large fraction of SNe II experience substantial mass-loss beyond the standard mass-loss prescription prior to their explosions, highlighting the uncertainties involved in the massive star evolution and pre-SN mass-loss mechanism.