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Over its lifespan, the Vera C. Rubin Observatory Legacy Survey of Space andTime (LSST) will monitor millions of supernovae (SNe) from explosion tooblivion, yielding an unprecedented ugrizy photometric dataset on theirlate-time evolution. Here, we show that the photometric evolution of Type IbcSNe can be used to constrain numerous properties of their ejecta, without theneed for expensive spectroscopic observations. Using radiative-transfersimulations for explosions of He-star progenitors of different initial masses,we show that the g-band filter follows primarily the strength of the FeIIemission, the r-band [OI]6300-6364A and [NII]6548-6583A, the i-band[CaII]7291,7323A, and the z-band the CaII NIR triplet, and hence providesinformation on nucleosynthetic yields. Information on weaker lines, which maybe used, for example, to constrain clumping, is absent. However, thisdeficiency may eventually be cured by improving the physical realism ofradiative-transfer simulations through a closer connection to physicallyconsistent 3D explosion models, and by the judicial selection of a much smallerset of spectral observations. Degeneracies inherent to the SN radiation willaffect the interpretation of photometric measures, but line fluxes fromnebular-phase spectra are similarly compromised. Importantly, our ``family'' ofType Ibc SN models follows a distinct trajectory in color-color magnitudediagrams as the ejecta evolve from 100 to 450d, allowing one to disentangledifferent progenitors or explosions. This photometric procedure provides apromising approach to study statistical samples of SNe Ibc and to confront themto ever improving progenitor and explosion models, to capture the onset oflate-time interaction with circumstellar material, or to identify eventscurrently unknown.

Using LSST late-time photometry to constrain Type Ibc supernovae and their progenitors