Supernova Precursor Emission and the Origin of Pre-Explosion Stellar Mass-Loss

Abstract

A growing number of core collapse supernovae (SNe) which show evidence for interaction with dense circumstellar material (CSM) are accompanied by "precursor" optical emission rising weeks to months prior to the explosion. The precursor luminosities greatly exceed the Eddington limit of the progenitor star, implying they are accompanied by substantial mass-loss. Here, we present a semi-analytic model for SN precursor light curves which we apply to constrain the properties and mechanisms of the pre-explosion mass-loss. We explore two limiting mass-loss scenarios: (1) an "eruption" arising from shock break-out following impulsive energy deposition below the stellar surface; (2) a steady "wind" due to sustained heating of the progenitor envelope. The eruption model, which resembles a scaled-down version of Type IIP SNe, can explain the luminosities and timescales of well-sampled precursors, for ejecta masses $\sim 0.1-1M_{\odot }$ and velocities $\sim 100-1000\mathrm{km}{\mathrm{s}}^{-1}$. By contrast, the steady-wind scenario cannot explain the highest precursor luminosities $\gtrsim 10^{41}\mathrm{erg}{\mathrm{s}}^{-1}$, under the constraint that the total ejecta mass not exceed the entire progenitor mass (though the less-luminous SN 2020tlf precursor can be explained by a mass-loss rate $\sim 1M_{\odot }\mathrm{y}{\mathrm{r}}^{-1}$). However, shock interaction between the wind and pre-existing (earlier ejected) CSM may boost its radiative efficiency and mitigate this constraint. In both eruption and wind scenarios the precursor ejecta forms compact ($\lesssim 10^{15}$ cm) optically-thick CSM at the time of core collapse; though only directly observable via rapid post-explosion spectroscopy ($\lesssim$ few days before being overtaken by the SN ejecta), this material can boost the SN luminosity via shock interaction.

arXiv comment21 pages, 8 figures, 2 tables, accepted for publication in ApJ

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