MASTER OT J030227.28+191754.5：一次前所未有的能量极大的矮白天悬疑星暴发事件
太阳与恒星天体物理
2024-08-28 v1 高能天体物理现象
摘要
我们对2021-2022年 MASTER OT J030227.28+191754.5 矮白天悬疑星暴发事件进行详尽研究，暴发幅度达到10.2个星等，持续时间为60天。通过检测到(1)双峰光学发射线和(2)早期和普通超峰，确定了 MASTER OT J030227.28+191754.5 为一次异常强大的WZ Sge型矮白天悬疑星暴发。根据超峰观测结果，我们确定其轨道周期为0.05986(1)天，质量比为0.063(1)。这些参数均位于低质量比矮白天悬疑星的典型范围内。根据基于热-潮汐不稳定模型推导的二元参数，我们的分析表明:(1)标准盘模型需要约10^20 g s^-1的吸积率才能解释其峰值光学亮度;(2)在暴发初始时，大量质量储存在盘中。这些现象无法仅通过其主白矮星质量(≥1.15 M☉)的冲击来解释。相反，我们提出，这一异常强大的矮白天悬疑星暴发的可能起源是其他WZ Sge型矮白天悬疑星更低的平静态黏性。除非倾角低于40°(此时盘较亮，解释暴发幅度)，此讨论在大多数可能的二元参数空间中都具有定性有效性。然而，此类低倾角将无法在当前热-潮汐不稳定模型中检测到早期超峰。在暴发峰值时，光学光谱显示出巨大的巴氏、He I和He II系列发射线，其核心宽度小于约800 km s^-1。结合其二元参数，Keplerian盘无法解释此窄线成分，但其可能起源是盘状风。
引用
@article{arxiv.2408.13783,
title = {MASTER OT J030227.28+191754.5: an unprecedentedly energetic dwarf nova outburst},
author = {Yusuke Tampo and Taichi Kato and Keisuke Isogai and Mariko Kimura and Naoto Kojiguchi and Daisaku Nogami and Junpei Ito and Masaaki Shibata and Masayuki Yamanaka and Kenta Taguchi and Hiroyuki Maehara and Hiroshi Itoh and Katsura Matsumoto and Momoka Nakagawa and Yukitaka Nishida and Shawn Dvorak and Katsuhiro L. Murata and Ryohei Hosokawa and Yuri Imai and Naohiro Ito and Masafumi Niwano and Shota Sato and Ryotaro Noto and Ryodai Yamaguchi and Malte Schramm and Yumiko Oasa and Takahiro Kanai and Yu Sasaki and Tamás Tordai and Tonny Vanmunster and Seiichiro Kiyota and Nataly Katysheva and Sergey Yu. Shugarov and Alexandra M. Zubareva and Sergei Antipin and Natalia Ikonnikova and Alexandr Belinski and Pavol A. Dubovsky and Tomáš Medulka and Jun Takahashi and Masaki Takayama and Tomohito Ohshima and Tomoki Saito and Miyako Tozuka and Shigeyuki Sako and Masaomi Tanaka and Nozomu Tominaga and Takashi Horiuchi and Hidekazu Hanayama and Daniel E. Reichart and Vladimir V. Kouprianov and James W. Davidson and Daniel B. Caton and Filipp D. Romanov and David J. Lane and Franz-josef Hambsch and Norio Narita and Akihiko Fukui and Masahiro Ikoma and Motohide Tamura and Koji S. Kawabata and Tatsuya Nakaoka and Ryo Imazawa},
journal= {arXiv preprint arXiv:2408.13783},
year = {2024}
}
备注
23 pages, 13 figures, 2 tables. Accepted by PASJ. Part of the online supplemental information is included