系外行星大气层方面，JWST 优于哈勃

IF 12.9 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2024-10-10 DOI:10.1038/s41550-024-02401-w

Luca Maltagliati

引用次数: 0

摘要

在 JWST 之前，有哈勃望远镜：凭借其宽视场相机 3 (WFC3) 在近红外（0.8-1.7 µm）的良好覆盖范围，哈勃望远镜成为了描述系外行星大气特征的参考望远镜。与哈勃相比，JWST 拥有更宽的波长范围和更高的精度，但其中有多少能有效转化为更好的结果，哪个是主要的改进因素？作者分析了 WFC3 和 JWST/NIRISS 在单天体无缝模式（0.6-2.8 µm）下获得的参考热木星 WASP-39 b 的光谱，并使用了相同的最新贝叶斯模型。他们特别研究了水波段，这是在 WFC3 波段范围内唯一能探测到的波段。NIRISS 在约束水探测置信度（21.3σ 对 9.0σ）及其丰度方面确实做得更好，而 WFC3 则大大高估了水的丰度。此外，NIRISS 还能初步探测到其他物种（CO2、K），并倾向于大气结构的非等温+非灰云模型，而 WFC3 则无法区分不同的大气剖面。作者指出，这一改进的主要因素是 NIRISS 波长范围扩大，提供了更可靠的连续信息。

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来源期刊

Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics

CiteScore

19.50

自引率

2.80%

发文量

252

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