A sequence of Type Ib, IIb, II-L, and II-P supernovae from binary-star progenitors of varying initial separation

Abstract

Over the last decade, evidence has accumulated that massive stars do not typically evolve in isolation but instead follow a tumultuous journey with a companion star on their way to core collapse. While Roche-lobe overflow appears instrumental for the production of a large fraction of supernovae (SNe) of Type Ib and Ic, variations in the initial orbital period Pinit of massive interacting binaries may also produce a wide diversity of case B, BC, or C systems, with preSN stars endowed from minute to massive H-rich envelopes. Focusing here on the explosion of the primary, donor star, originally of 12.6Msun, we use radiation-hydrodynamics and NLTE time-dependent radiative transfer to document the gas and radiation properties of such SNe, covering from Type Ib, IIb, II-L to II-P. Variations in Pinit are the root cause behind the wide diversity of our SN light curves, with single-peak, double-peak, fast-declining or plateau-like morphologies in the V band. The different ejecta structures, expansion rates, and relative abundances (e.g., H, He, 56Ni) are conducive to much diversity in spectral line shapes (absorption vs emission strength, width) and evolution. We emphasize that Halpha is a key tracer of these modulations, and that HeI7065 is an enduring optical diagnostic for the presence of He. Our grid of simulations fare well against representative SNe Ib, IIb, and IIP SNe, but interaction with circumstellar material, which is ignored in this work, is likely at the origin of the tension between our Type IIL SN models and observations (e.g., SN2006Y). Remaining discrepancies in our model rise time to bolometric maximum call for a proper account of both small-scale and large-scale structures in core-collapse SN ejecta. Discrepant Type IIP SN models, with a large plateau brightness but small line widths, may be cured by adopting more compact red-supergiant star progenitors.

Submitted to A&A on Dec 22nd, 2023

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