在温暖的海王星上发现了SO2,酸盐云,但没有CH4
Achrène Dyrek1, Michiel Min2, Leen Decin3
1Université Paris Cité, Université Paris-Saclay, CEA, CNRS, AIM, Gif-sur-Yvette, France. achrene.dyrek@cea.fr.
Nature
|November 15, 2023
概括
詹姆斯·韦伯太空望远镜检测出WASP-107b系外行星大气中的二氧化硫 (SO2) 和酸盐云. 这一发现揭示了较冷的系外行星中的光化学反应,
科学领域:
- 外行星科学
- 大气化学
- 天体生物学
背景情况:
- WASP-107b是一个海王星质量的系外行星,与木星相似的半径,以其扩展的大气和先前的水蒸气和高海拔凝聚物的检测而闻名.
- 之前在热系外行星中检测到二氧化硫 (SO2),但在WASP-107b (1000K以下) 等较冷大气层中没有预期它的形成.
- 太阳系外行星中光化学的检测仅限于高温环境.
研究的目的:
- 通过先进的光谱分析研究温暖系外行星WASP-107b的大气组成.
- 确定二氧化硫 (SO2) 的存在及其对较冷系外行星的光化学影响.
- 确定云的组成,评估大气动态和金属性.
主要方法:
- 在詹姆斯·韦伯太空望远镜 (JWST) 上使用中红外仪器 (MIRI) 进行传输光谱.
- 分析了WASP-107b的传输频谱,专注于7.35微米和8.69微米波长波段.
- 进行光谱分析以确定分子物种,云组成和大气特性.
主要成果:
- 在WASP-107b大气中证实存在二氧化硫 (SO2).
- 检测到具有强大的统计意义的酸盐云 (约7σ),排除了更简单的云模型.
- 证实存在水 (大约12σ),但没有发现甲的证据,表明化学不平衡.
结论:
- WASP-107b是第二个证实光化学的系外行星,其探测温度范围扩大到大约740K.
- 这些发现表明有超太阳性金属的活跃大气层.
- SO2和酸盐云的存在为温暖系外行星的大气过程提供了新的洞察力.
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