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arXiv 1202.0659astro-ph.SRastro-ph.CO
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明亮的IIP型SN 2009 bw,显示出相互作用的迹象

The bright Type IIP SN 2009bw, showing signs of interaction

C. Inserra, M. Turatto, A. Pastorello, M. L. Pumo, E. Baron, S. Benetti, E. Cappellaro, S. Taubenberger, F. Bufano, N. Elias-Rosa, L. Zampieri, A. Harutyunyan, … 展开作者

C. Inserra, M. Turatto, A. Pastorello, M. L. Pumo, E. Baron, S. Benetti, E. Cappellaro, S. Taubenberger, F. Bufano, N. Elias-Rosa, L. Zampieri, A. Harutyunyan, A. S. Moskvitin, M. Nissinen, V. Stanishev, D. Y. Tsvetkov, V. P. Hentunen, V. N. Komarova, N. N. Pavlyuk, V. V. Sokolov, T. N. Sokolova

摘要:

本文介绍了UGC 2890中IIP型超新星2009 bw从爆发后几天到241天的光度学和光谱学。SN 2009 bw在光球相期间的光变曲线与正常SNe IIP的光变曲线相似,但具有更亮的峰值和平台(Mmax R = -17.82 mag,Mplateau R = -17.37 mag)。从光球到星云阶段的光度下降是有史以来观测到的最快的之一,大约13天内达到2.2等。辐射热光变曲线的放射性尾部表明56 Ni的喷射量为\approx 0.022 M \odot。光球光谱显示直到激波爆发后约105天的Hα和Hβ高速线,这表明SN喷出物和先前存在的星周物质之间可能存在早期相互作用,以及CNO元素的存在。通过模拟辐射热光变曲线、喷出物膨胀速度和光球温度,我们估计出\odot的总质量为8- 12 M,动能约为0.3 foe,初始半径约为3.6 - 7 \times 10^13 cm。

英文摘要:

We present photometry and spectroscopy of the type IIP supernova 2009bw in UGC 2890 from few days after the outburst to 241 days. The light curve of SN 2009bw during the photospheric phase is similar to that of normal SNe IIP but with brighter peak and plateau (Mmax R = -17.82 mag, Mplateau R = -17.37 mag). The luminosity drop from the photospheric to the nebular phase is one of the fastest ever observed, ~2.2 mag in about 13 days. The radioactive tail of the bolometric light curve indicates that the amount of ejected 56 Ni is \approx 0.022 M\odot. The photospheric spectra reveal high velocity lines of Hα and Hβ until about 105 days 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 modeling the bolometric light curve, ejecta expansion velocity and photospheric temperature, we estimate a total ejected mass of 8-12M\odot, a kinetic energy of ~0.3 foe and an initial radius of ~ 3.6 - 7 \times 10^13 cm.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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