Partial stellar explosions - ejected mass and minimal energy

Many massive stars appear to undergo enhanced mass-loss during late stages of their evolution. In some cases, the ejected mass likely originates from non-terminal explosive outbursts, rather than continuous winds. Here we study the dependence of the ejecta mass, m(ej), on the energy budget E of an explosion deep within the star, using both analytical arguments and numerical hydrodynamics simulations. Focusing on polytropic stellar models, we find that for explosion energies smaller than the stellar binding energy, the ejected mass scales as m(ej) proportional to E-epsilon m, where epsilon(m) = 2.4-3.0 depending on the polytropic index. The loss of energy due to shock breakout emission near the stellar edge leads to the existence of a minimal mass-shedding explosion energy, corresponding to a minimal ejecta mass. For a wide range of progenitors, from Wolf-Rayet stars to red supergiants (RSGs), we find a similar limiting energy of E-min approximate to 10(46)-10(47) erg, almost independent of the stellar radius. The corresponding minimal ejecta mass varies considerably across different progenitors, ranging from similar to 10(-8) M-circle dot in compact stars, up to similar to 10(-2) M-circle dot in RSGs. We discuss implications of our results for pre-supernova outbursts driven by wave heating, and complications caused by the non-constant opacity and adiabatic index of realistic stars.

Automated summary

The study shows that massive stars may undergo enhanced mass-loss during late stages of evolution, with the ejected mass scaling with explosion energy for energies smaller than the stellar binding energy. There is a minimal ejecta mass associated with a minimum explosion energy, while the limiting energy appears to be independent of the stellar radius.