来自最高质量红超巨星前身星的最低金属丰度 II 型超新星
高能天体物理现象
2018-05-14 v1 太阳与恒星天体物理
摘要
红超巨星已被确认为大多数富氢 II 型超新星的前身星。然而，尽管观测到质量 >25M_⊙ 的此类恒星，对 >18M_⊙ 前身星的探测仍然难以实现。红超巨星也预期在所有金属丰度下形成，但来自低金属丰度前身星的爆发发现很少。在此，我们报告 II 型超新星 SN 2015bs 的观测，通过与会照片期光谱模型比较推断其前身星金属丰度 ≤0.1Z_⊙，并通过与星云期光谱模型比较得到零龄主序质量 17-25M_⊙。SN 2015bs 显示正常的“平台”光变曲线形态和典型光谱性质，意味着一个红超巨星前身星。这是“正常” II 型超新星具有如此高质量前身星的首个例子，暗示高质量红超巨星爆发与低金属丰度前身星之间存在联系。
引用
@article{arxiv.1805.04434,
title = {The lowest metallicity type II supernova from the highest mass red-supergiant progenitor},
author = {J. P. Anderson and L. Dessart and C. P. Gutiérrez and T. Krühler and L. Galbany and A. Jerkstrand and S. J. Smartt and C. Contreras and N. Morrell and M. M. Phillips and M. D. Stritzinger and E. Y. Hsiao and S. González-Gaitán and C. Agliozzo and S. Castellón and K. C. Chambers and T. -W. Chen and H. Flewelling and C. Gonzalez and G. Hosseinzadeh and M. Huber and M. Fraser and C. Inserra and E. Kankare and S. Mattila and E. Magnier and K. Maguire and T. B. Lowe and J. Sollerman and M. Sullivan and D. R. Young and S. Valenti},
journal= {arXiv preprint arXiv:1805.04434},
year = {2018}
}
备注
Accepted for publication in Nature Astronomy. Archive submission includes main text plus one table and three figures, together with Supplementary Information with an additional 12 figures and five tables