H is for hydrocarbon

IF 14.3 1区物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS

Nature Astronomy Pub Date : 2025-08-18 DOI:10.1038/s41550-025-02642-3

Paul Woods

引用次数: 0

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H代表碳氢化合物

JWST提供了探测无数次恒星天体的机会，并比以前更有效地描述它们。Kevin Luhman和Catarina Alves de Oliveira使用NIRSpec观测了15颗褐矮星（BD）候选者，其中几颗在光谱中表现出脂肪族烃吸收特征，据推测这与它们的包壳温度较低有关。作者为这些非常冷的褐矮星提出了一种新的光谱分类：h .光谱观察到的BD候选者是在英仙座附近恒星形成区域的年轻星团IC 348中发现的，并且是一个更大的，光度选择样本的一部分。NIRSpec/PRISM的观测覆盖了0.6-5.3 μm的波长范围，其中包括由于甲烷吸收而产生的~3.3 μm波段（见于t -矮星）和通常与星际脂肪烃相关的3.4 μm波段。在这15个天体中，有4个是正常的l矮星，没有碳氢化合物特征，其余11个具有3.4 μm特征。这一特征在光线较暗、温度较低的光源中变得更强。在土星和土卫六的大气中也发现了类似的3.4 μm特征，这与雾霾有关。

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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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