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arXiv 1010.3199astro-ph.SR
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Ib型SN 1999 dn:一年的光度和光谱监测

The Type Ib SN 1999dn: One Year of Photometric and Spectroscopic Monitoring

S. Benetti, M. Turatto, S. Valenti, A. Pastorello, E. Cappellaro, M. T. Botticella, F. Bufano, F. Ghinassi, A. Harutyunyan, C. Inserra, A. Magazzu', F. Patat, M… 展开作者

S. Benetti, M. Turatto, S. Valenti, A. Pastorello, E. Cappellaro, M. T. Botticella, F. Bufano, F. Ghinassi, A. Harutyunyan, C. Inserra, A. Magazzu', F. Patat, M. L. Pumo, S. Taubenberger

摘要:

对Ib型超新星1999 dn进行了广泛的光学和近红外(NIR)观测,涵盖了爆炸后的第一年。这些新的数据使这个已经被认为是SNIb原型的物体成为同类中观察最好的物体之一。SN 1999 dn的光变曲线形状与其他SNeIb的光变曲线形状基本相似,但有一个中等微弱的峰值(M_V=-17.2等)。根据测辐射热的光变曲线和喷出物的膨胀速度,我们估计在爆炸过程中产生了大约0.11 Msun的56 Ni,喷出物的总质量为4-6 Msun,动能至少为5 × 10 ^{51} erg。SN 1999 dn在不同时期的光谱与其他剥壳(SE)SNe的光谱相似,表明在早期时期明显存在H。高爆炸能量和喷射质量,以及在星云光谱中测量到的小流量比[CaII]/[OI],加上缺乏尘埃形成的特征和相对高的金属丰度环境,指向SN 1999 dn的单一大质量祖先(M_ZAMS>=23-25 Msun)。

英文摘要:

Extensive optical and near-infrared (NIR) observations of the type Ib supernova 1999dn are presented, covering the first year after explosion. These new data turn this object, already considered a prototypical SNIb, into one of the best observed objects of its class. The light curve of SN 1999dn is mostly similar in shape to that of other SNeIb but with a moderately faint peak M_V=-17.2 mag). From the bolometric light curve and ejecta expansion velocities, we estimate that about 0.11 Msun of 56Ni were produced during the explosion and that the total ejecta mass was 4-6 Msun with a kinetic energy of at least 5x10^{51} erg. The spectra of SN 1999dn at various epochs are similar to those of other Stripped Envelope (SE) SNe showing clear presence of H at early epochs. The high explosion energy and ejected mass, along with the small flux ratio [CaII]/[OI] measured in the nebular spectrum, together with the lack of signatures of dust formation and the relatively high-metallicity environment point toward a single massive progenitor (M_ZAMS>=23-25 Msun) for SN 1999dn.

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