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arXiv 1805.04434astro-ph.HEastro-ph.SR
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最低金属丰度类型II超新星来自最高质量红超巨星祖先

The lowest metallicity type II supernova from the highest mass red-supergiant progenitor

J. P. Anderson, L. Dessart, C. P. Gutiérrez, T. Krühler, L. Galbany, A. Jerkstrand, S. J. Smartt, C. Contreras, N. Morrell, M. M. Phillips, M. D. Stritzinger, E… 展开作者

J. P. Anderson, L. Dessart, C. P. Gutiérrez, T. Krühler, L. Galbany, A. Jerkstrand, S. J. Smartt, C. Contreras, N. Morrell, M. M. Phillips, M. D. Stritzinger, E. Y. Hsiao, S. González-Gaitán, C. Agliozzo, S. Castellón, K. C. Chambers, T. -W. Chen, H. Flewelling, C. Gonzalez, G. Hosseinzadeh, M. Huber, M. Fraser, C. Inserra, E. Kankare, S. Mattila, E. Magnier, K. Maguire, T. B. Lowe, J. Sollerman, M. Sullivan, D. R. Young, S. Valenti

摘要:

红超巨星已经被证实是大多数富氢II型超新星的祖先。然而,虽然这些恒星的质量大于25 M $_\odot$,但探测到大于18 M $_\odot$的祖先仍然难以捉摸。红超巨星也有望在所有金属丰度下形成,但从低金属丰度祖先爆发的发现很少。在这里,我们报告的II型超新星,SN 2015 bs的观测,我们推断的祖先金属丰度$\leq$ 0.1 Z $_\odot$通过比较光球相光谱模型,和零年龄主序列质量17- 25 M $_\odot$通过比较星云相光谱模型。SN 2015 bs显示出正常的“平台”光变曲线形态和典型的光谱特性,暗示着它是一颗红超巨星的前身。这是第一个这样的高质量祖先的“正常”II型超新星的例子,表明高质量红超巨星爆炸和低金属量祖先之间的联系。

英文摘要:

Red supergiants have been confirmed as the progenitor stars of the majority of hydrogen-rich type II supernovae. However, while such stars are observed with masses >25M$_\odot$, detections of >18M$_\odot$ progenitors remain elusive. Red supergiants are also expected to form at all metallicities, but discoveries of explosions from low-metallicity progenitors are scarce. Here, we report observations of the type II supernova, SN 2015bs, for which we infer a progenitor metallicity of $\leq$0.1Z$_\odot$ from comparison to photospheric-phase spectral models, and a Zero Age Main-Sequence mass of 17-25M$_\odot$ through comparison to nebular-phase spectral models. SN 2015bs displays a normal 'plateau' light-curve morphology, and typical spectral properties, implying a red supergiant progenitor. This is the first example of such a high mass progenitor for a 'normal' type II supernova, suggesting a link between high mass red supergiant explosions and low-metallicity progenitors.

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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