JWST over Hubble for exoplanetary atmospheres

IF 12.9 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS
Luca Maltagliati
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引用次数: 0
系外行星大气层方面,JWST 优于哈勃
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
Nature Astronomy Physics and Astronomy-Astronomy and Astrophysics
CiteScore
19.50
自引率
2.80%
发文量
252
期刊介绍: Nature Astronomy, the oldest science, has played a significant role in the history of Nature. Throughout the years, pioneering discoveries such as the first quasar, exoplanet, and understanding of spiral nebulae have been reported in the journal. With the introduction of Nature Astronomy, the field now receives expanded coverage, welcoming research in astronomy, astrophysics, and planetary science. The primary objective is to encourage closer collaboration among researchers in these related areas. Similar to other journals under the Nature brand, Nature Astronomy boasts a devoted team of professional editors, ensuring fairness and rigorous peer-review processes. The journal maintains high standards in copy-editing and production, ensuring timely publication and editorial independence. In addition to original research, Nature Astronomy publishes a wide range of content, including Comments, Reviews, News and Views, Features, and Correspondence. This diverse collection covers various disciplines within astronomy and includes contributions from a diverse range of voices.
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