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arXiv 1504.06207astro-ph.HEastro-ph.CO
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SN 2013 ej-一颗IIL型超新星,有微弱的相互作用迹象

SN 2013ej - A type IIL supernova with weak signs of interaction

Subhash Bose, Firoza Sutaria, Brijesh Kumar, Chetna Duggal, Kuntal Misra, Peter J. Brown, Mridweeka Singh, Vikram Dwarkadas, Donald G. York, Sayan Chakraborti, … 展开作者

Subhash Bose, Firoza Sutaria, Brijesh Kumar, Chetna Duggal, Kuntal Misra, Peter J. Brown, Mridweeka Singh, Vikram Dwarkadas, Donald G. York, Sayan Chakraborti, H. C. Chandola, Julie Dahlstrom, Alak Ray, Margarita Safonova

摘要:

我们提出了超新星2013 ej的光学光度和光谱观测。它是附近($\sim 10$ Mpc)星系NGC 628中爆发的最明亮的II型超新星之一。光变曲线特征与II型SNe相似,但具有相对较短($ \sim85 $日)和较陡(V中$ \sim1.7 $ mag(100 d)$^{-1} $)的平台期。SN在从平台到星云的转变过程中,V波段亮度下降了2.4等。绝对紫外(UV)光变曲线与SN 2012 aw相同,显示出相似的UV平台趋势,延长至85天。根据尾部光度估算的放射性$^{56}$ Ni质量为$ 0.02 $ M $_{\odot}$,明显低于典型的IIP SNe。谱特征和线速度演化特征表明SN 2013 ej为II型地震。然而,光变曲线特征和一些光谱特征提供了强有力的支持,在分类为IIL型事件。一个详细的SYNOW模型的光谱表明,在H $α$和H $β$配置文件中存在一些高速组件,这意味着可能的喷出物CSM相互作用。星云相位谱在H $α$发射中显示出一个不寻常的缺口,这可能表明$^{56}$ Ni的双极分布。对测辐射热光变曲线的模拟得出了原始质量为$ \sim14 $ M $_{\odot}$,半径为$ \sim450 $ R $_{\odot}$,总爆炸能量为$ \sim2.3\times10^{51} $ erg。

英文摘要:

We present optical photometric and spectroscopic observations of supernova 2013ej. It is one of the brightest type II supernovae exploded in a nearby ($\sim 10$ Mpc) galaxy NGC 628. The light curve characteristics are similar to type II SNe, but with a relatively shorter ($ \sim85 $ day) and steeper ($ \sim1.7 $ mag (100 d)$^{-1} $ in V) plateau phase. The SN shows a large drop of 2.4 mag in V band brightness during plateau to nebular transition. The absolute ultraviolet (UV) light curves are identical to SN 2012aw, showing a similar UV plateau trend extending up to 85 days. The radioactive $^{56}$Ni mass estimated from the tail luminosity is $ 0.02 $M$_{\odot}$ which is significantly lower than typical type IIP SNe. The characteristics of spectral features and evolution of line velocities indicate that SN 2013ej is a type II event. However, light curve characteristics and some spectroscopic features provide strong support in classifying it as a type IIL event. A detailed SYNOW modelling of spectra indicates the presence of some high velocity components in H$α$ and H$β$ profiles, implying possible ejecta-CSM interaction. The nebular phase spectrum shows an unusual notch in the H$α$ emission which may indicate bipolar distribution of $^{56}$Ni. Modelling of the bolometric light curve yields a progenitor mass of $ \sim14 $M$_{\odot}$ and a radius of $ \sim450 $R$_{\odot}$, with a total explosion energy of $ \sim2.3\times10^{51} $ erg.

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