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arXiv 2102.01095astro-ph.EP
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用HARPS确认WASP-76 b中的不对称铁吸收

Confirmation of Asymmetric Iron Absorption in WASP-76b with HARPS

Aurora Y. Kesseli, I. A. G. Snellen

摘要:

预计炎热的天气会有炎热、晴朗的白天和凉爽、多云的夜晚。最近,在欧洲南方天文台的甚大望远镜上使用ESTERO在WASP-76 b的透射光谱中解决了铁吸收的不对称特征。这一特征被解释为是由于铁在夜面的凝结,导致夜晚的吸收信号与早晨的不同。这是首次在单个系外行星的表面观察到化学梯度。在这项工作中,我们确认的不对称铁功能使用档案HARPS数据的四个过境的存在。探测表明,这些特征也可以通过在较小的望远镜上观察多次凌日来解决。通过增加检测到这些凝结特征的行星数量,我们可以首次在系外行星之间进行化学比较,并在一系列参数范围内绘制凝结地图。

英文摘要:

Hot Jupiters are predicted to have hot, clear daysides and cooler, cloudy nightsides. Recently, an asymmetric signature of iron absorption has been resolved in the transmission spectrum of WASP-76b using ESPRESSO on ESO's Very large Telescope. This feature is interpreted as being due to condensation of iron on the nightside, resulting in a different absorption signature from the evening than from the morning limb of the planet. It represents the first time that a chemical gradient has been observed across the surface of a single exoplanet. In this work, we confirm the presence of the asymmetric iron feature using archival HARPS data of four transits. The detection shows that such features can also be resolved by observing multiple transits on smaller telescopes. By increasing the number of planets where these condensation features are detected, we can make chemical comparisons between exoplanets and map condensation across a range of parameters for the first time.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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