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arXiv 1605.03136astro-ph.SRastro-ph.HE
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类1987A超新星2009mw的测光和光谱

Optical photometry and spectroscopy of the 1987A-like supernova 2009mw

K. Takáts, G. Pignata, M. Bersten, M. L. Rojas Kaufmann, J. P. Anderson, G. Folatelli, M. Hamuy, M. Stritzinger, J. B. Haislip, A. P. LaCluyze, J. P. Moore, D. Reichar

摘要:

本文介绍了类1987A超新星(SN)2009mw的光学光度和光谱观测结果。我们的$BVRI$和$g'r'i'z'$测光涵盖了167天的演化,包括上升到光变曲线最大值,并在线性尾部阶段开始后结束。我们比较了SN 2009mw与同子群其它SNe的观测性质,发现它与几个天体有相似之处。通过流体动力学模型估算了原始体和SN的物理参数,得出爆炸能量为$1$ foe,SN前质量为$19\,{\rm M_{\odot}}$,原始体半径为$30\,{\rm R_{\odot}}$,$^{56}$ Ni质量为$0.062\,{\rm M_{\odot}}$。这些数值表明SN 2009 mw的前身是一颗蓝超巨星,类似于SN 1987 A的前身。我们研究了SN 2009mw的宿主环境,发现它来自一个具有轻微亚太阳金属性的种群。

英文摘要:

We present optical photometric and spectroscopic observations of the 1987A-like supernova (SN) 2009mw. Our $BVRI$ and $g'r'i'z'$ photometry covers 167 days of evolution, including the rise to the light curve maximum, and ends just after the beginning of the linear tail phase. We compare the observational properties of SN 2009mw with those of other SNe belonging to the same subgroup, and find that it shows similarities to several objects. The physical parameters of the progenitor and the SN are estimated via hydrodynamical modelling, yielding an explosion energy of $1$ foe, a pre-SN mass of $19\,{\rm M_{\odot}}$, a progenitor radius as $30\,{\rm R_{\odot}}$ and a $^{56}$Ni mass as $0.062\,{\rm M_{\odot}}$. These values indicate that the progenitor of SN 2009mw was a blue supergiant star, similar to the progenitor of SN 1987A. We examine the host environment of SN 2009mw and find that it emerged from a population with slightly sub-solar metallicty.

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