SN2023ixf: ultraviolet-to-infrared radiative-transfer modeling of the nebular-phase evolution until 1000 days

Abstract

We present non-local thermodynamic equilibrium radiative-transfer modeling of SN2023ixf during the nebular phase out to 1000d, using the same ejecta that matched its photospheric evolution, namely a partially stripped red-supergiant star of initially 15Msun whose terminal explosion yielded ejecta with 7-8Msun, kinetic energy of 1.2e51erg, and 56Ni mass of 0.05Msun, augmented with a cold dense shell (CDS) of 0.2Msun at 8000km/s. Interaction with circumstellar material persists at all epochs, powering the ultraviolet (UV) flux at all times, but dominating the optical only after ~600d. Matching the V-band light curve requires invoking both enhanced gamma-ray escape and dust formation after ~200d, first in the CDS and eventually in the inner ejecta as well. Depending on where they form relative to the dust, emission lines are uniformly attenuated or skewed with a blue-red asymmetry. Our models suggest a rising dust mass (chosen as an C-rich and Si-rich mixture) in the CDS and inner ejecta, possibly reaching 1e-4Msun at 700d, while an external cold dust component is required to match the mid-infrared emission. The UV radiation, largely unaffected by dust, is influenced by the emission and absorption from Fe lines, together with strong, blueshifted emission from Lyalpha and MgII2800, both present at >~200d and with a strengthening fractional flux thereafter. Optical-depth effects play a critical role for the UV flux, and most notably on Lyalpha whose strength depends strongly on the CDS structure (mass and extent) and the treatment of power injection. The CDS is continuously slowing down from 8000km/s at 112d to ~6500km/s at 998d, suggesting a growth in mass of several 0.1Msun. SN2023ixf shares many similarities with SN1993J at 1-3yr, but it is eventually fainter due to dust extinction and cooler (i.e., weak [NII] and no [OIII] lines) likely as a result of greater CDS and ejecta masses.