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一个复杂的气逃逸结构,覆盖了超热木星WASP-121 b轨道的一半以上
Romain Allart1, Louis-Philippe Coulombe2, Yann Carteret3
1Institut Trottier de recherche sur les exoplanètes, Département de Physique, Université de Montréal, Montréal, QC, Canada. romain.allart@umontreal.ca.
Nature communications
|December 8, 2025
概括
我们使用JWST观测了系外行星WASP-121 b,并通过其轨道的大部分区域通过吸收检测出持续的大规模大气流出. 这揭示了塑造系外行星演变的水力动力逃逸的细节.
科学领域:
- 外系行星科学 外系行星科学
- 天体物理学 天体物理学
- 行星大气层的行星大气层
背景情况:
- 大气逃逸,由恒星辐射驱动,对于理解系外行星的演化,组成和动态至关重要.
- 超稳定的三重体 (10833 Å) 是测量系外行星质量损失的关键标记物.
- 之前的研究缺乏持续的观测,无法准确地绘制系外行星外流的程度.
研究的目的:
- 为了对超热的木星WASP-121 b进行连续的,全轨道的相曲线观测.
- 精确确定系外行星大气外流的物理范围和结构.
- 为了研究恒星辐射对系外行星大气逃逸动态的影响.
主要方法:
- 使用詹姆斯·韦伯太空望远镜 (JWST) 和其近红外成像仪和无光谱仪 (NIRISS).
- 进行连续的全轨道相曲线观测,以检测吸收.
- 分析了检测到的吸收信号的空间和运动结构.
主要成果:
- 在近60%的WASP-121b轨道上检测到显著的吸收 (>3σ),表明持续的,大规模的外流.
- 解决了外流,形成一个密集的前尾向恒星移动,以及由恒星辐射推开的后尾.
- 观察到两个尾巴仍然远离行星发生碰撞,这表明强大的水力动力逃逸.
结论:
- 这些发现表明,JWST能够以前所未有的细节地绘制系外行星流出的地图.
- 目前的理论模型不足以完全复制出流的观察到的空间和运动结构.
- 该研究强调了太空和地面光谱学之间的协同作用,用于全面研究系外行星大气层.
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