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We explore the properties of Type II-Plateau (II-P) supernovae (SNe) togetherwith their red-supergiant (RSG) star progenitors. Using MESA STAR, we modulatethe parameters (e.g., mixing length, overshoot, rotation, metallicity) thatcontrol the evolution of a 15Msun main-sequence star to produce a variety ofphysical pre-SN models and SN II-P ejecta. We extend previous modeling of SNII-P radiation to include photospheric and nebular phases, as well asmulti-band light curves and spectra. Our treatment does not assume localthermodynamic equilibrium, is time dependent, treats explicitly the effects ofline blanketing, and incorporates non-thermal processes. We find that the colorproperties of SNe II-P require large model atoms for FeI and FeII, much largerthan adopted in Dessart & Hillier (2011). The color properties also imply RSGprogenitors of limited extent (~500Rsun) --- larger progenitor stars produce aSN II-P radiation that remains too blue for too long. This finding calls for areduction of RSG radii, perhaps through a strengthening of convective energytransport in RSG envelopes. Increased overshoot and rotation reduce the ratioof ejecta to helium-core mass, similarly to an increase in main-sequence mass,and thus complicate the inference ofprogenitor masses. In contrast to the greatsensitivity on progenitor radius, SN II-P color evolution appears insensitiveto variations in explosion energy. Finally, we document the numerous SN II-Psignatures that vary with progenitor metallicity, revealing their potential formetallicity determinations in the nearby and distant Universe.

Type II-Plateau supernova radiation: dependencies on progenitor and explosion properties