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We present results of a systematic study of the mass-loss properties of TypeIIn supernova progenitors within decades before their explosion. We apply ananalytic light curve model to 11 Type IIn supernova bolometric light curves toderive the circumstellar medium properties. We reconstruct the mass-losshistories based on the estimated circumstellar medium properties. The estimatedmass-loss rates are mostly higher than 1e-3 Msun/yr and they are consistentwith those obtained by other methods. The mass-loss rates are often found to beconstantly high within decades before their explosion. This indicates thatthere exists some mechanism to sustain the high mass-loss rates of Type IInsupernova progenitors for at least decades before their explosion. Thus, theshorter eruptive mass loss events observed in some Type IIn supernovaprogenitors are not always responsible for creating their dense circumstellarmedia. In addition, we find that Type IIn supernova progenitors may tend toincrease their mass-loss rates as they approach to the time of their explosion.We also show a detailed comparison between our analytic prediction andnumerical results.

Mass-loss histories of Type IIn supernova progenitors within decades before their explosion