普通型 Ia 超新星表面铁峰元素在初生阶段的红化现象
高能天体物理现象
2022-02-21 v1 太阳与恒星天体物理
摘要
Ia 型超新星是白矮星的热核爆炸。它们在宇宙的化学演化中扮演核心角色，并且是宇宙学距离的重要度量。然而，关于其起源仍存在未解之谜。尽管人们为从其最早信号获取诞生信息付出了大量努力，但迄今为止的观测未能确定它们中大多数如何爆炸。在此，我们呈现 SN 2018aoz 的初生阶段探测，其亮度低至 -10.5 绝对 AB 星等——这是迄今探测到的最暗的早期 Ia 型信号——揭示出在估计的初光时刻后 1.0 至 12.4 小时之间， 波段出现此前未见的平台期，导致快速的红向颜色演化。缺失的 波段流量最好由抛射物质量最外层 1% 中铁峰元素的线毯吸收来解释。该超新星观测到的 颜色演化也与同一最外层 1% 抛射物质量中铁峰元素过密度的预测相符，而若铁峰元素呈纯单调分布则预期颜色更蓝。抛射物极外层中多余核合成物质的存在，指向某些普通 Ia 型超新星爆炸中增强的表面核燃烧或扩展的亚声速混合过程。
引用
@article{arxiv.2202.08889,
title = {Infant-phase reddening by surface Fe-peak elements in a normal Type Ia Supernova},
author = {Yuan Qi Ni and Dae-Sik Moon and Maria R. Drout and Abigail Polin and David J. Sand and Santiago Gonzalez-Gaitan and Sang Chul Kim and Youngdae Lee and Hong Soo Park and D. Andrew Howell and Peter E. Nugent and Anthony L. Piro and Peter J. Brown and Lluis Galbany and Jamison Burke and Daichi Hiramatsu and Griffin Hosseinzadeh and Stefano Valenti and Niloufar Afsariardchi and Jennifer E. Andrews and John Antoniadis and Iair Arcavi and Rachael L. Beaton and K. Azalee Bostroem and Raymond G. Carlberg and S. Bradley Cenko and Sang-Mok Cha and Yize Dong and Avishay Gal-Yam and Joshua Haislip and Thomas W. -S. Holoien and Sean D. Johnson and Vladimir Kouprianov and Yongseok Lee and Christopher D. Matzner and Nidia Morrell and Curtis McCully and Giuliano Pignata and Daniel E. Reichart and Jeffrey Rich and Stuart D. Ryder and Nathan Smith and Samuel Wyatt and Sheng Yang},
journal= {arXiv preprint arXiv:2202.08889},
year = {2022}
}
备注
Accepted for publication in Nature Astronomy. Main text = 8 pages, 4 figures, 1 table; Full document = 46 pages, with Methods, Supplementary Information, 7 Supplementary figures, 2 Supplementary tables and references. Nat Astron (2022)