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We present a novel mechanism to enhance the mass-loss rates of massive starsshortly before their explosion. The neutrino luminosities of the stellar coreof massive stars become larger as they get closer to the time of the corecollapse. As emitted neutrinos escape freely from the core, the core mass issignificantly reduced when the neutrino luminosity is large. If a star is nearthe Eddington luminosity when the neutrino luminosity is large, the star canexceed the Eddington luminosity because of the core neutrino mass loss. Wesuggest that the stellar surface mass-loss rates due to the core neutrinoemission can be higher than 1e-4 Msun/yr from ~ 1 year before the corecollapse. The mass-loss rates can exceed 1e-2 Msun/yr in ~ 10 days before thecore collapse. This mass-loss mechanism may be able to explain the enhancedmass loss observed in some supernova progenitors shortly before theirexplosion. Even if the star is not close enough to the Eddington luminosity toenhance mass loss, the star can still expand because of the reducedgravitational force. This mechanism can be activated in Wolf-Rayet stars and itcan make hydrogen-poor, as well as hydrogen-rich, dense circumstellar mediaobserved in some supernovae.

Mass loss of massive stars near the Eddington luminosity by core neutrino emission shortly before their explosion