The bright Type IIP SN 2009bw, showing signs of interactionстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We present photometry and spectroscopy of the Type IIP supernova (SN IIP) 2009bw in UGC 2890 from a few days after the outburst to 241 d. The light curve of SN 2009bw during the photospheric phase is similar to that of normal SNe IIP but with a brighter peak and plateau. The luminosity drop from the photospheric to the nebular phase is one of the fastest ever observed, 2.2 mag in about 13 d. The radioactive tail of the bolometric light curve indicates that the amount of ejected 56Ni is 0.022 Msun. The photospheric spectra reveal high-velocity lines of Halpha and Hbeta until about 105 d after the shock breakout, suggesting a possible early interaction between the SN ejecta and pre-existent circumstellar material, and the presence of CNO elements. By modelling the bolometric light curve, ejecta expansion velocity and photospheric temperature, we estimate a total ejected mass of 8-12 Msun, a kinetic energy of 0.3 foe and an initial radius of 3.6-7 × 1013 cm.