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arXiv 2404.05652astro-ph.EPastro-ph.SR
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多普勒层析作为表征系外行星大气的工具 II:对 HD 179949 b 的分析

Doppler Tomography as a tool for characterising exoplanet atmospheres II: an analysis of HD 179949 b

S. M. Matthews, C. A. Watson, E. J. W. de Mooij, T. R. Marsh, M. Brogi, S. R. Merritt, K. W. Smith, D. Steeghs

AI总结:

本文采用多普勒层析分析热木星 HD 179949 b,在多个红外波段确认并新发现 CO 与 H2O 信号,且噪声低于互相关法,首次给出夜侧分子吸收证据。

摘要:

高分辨率多普勒光谱学为研究凌星和非凌星行星的大气提供了一条途径。这一强大方法还产生了迄今为止一些最可靠的大气探测结果。目前,高分辨率多普勒光谱学通过将观测数据与模型大气光谱进行互相关来探测大气信号。该技术已成功探测到 H2O、CO、HCN 和 TiO 等多种分子,以及若干原子物种。在这里,我们提出一种执行高分辨率多普勒光谱学的替代方法,使用一种称为多普勒层析的技术。我们利用多普勒层析对 HD 179949 b 进行分析,并给出多普勒层析图,证实了此前在 HD 179949 b 大气中于 2.3 微米处对 CO,以及在 2.3 微米和 3.5 微米处对 H2O 的探测;与应用于相同数据的互相关方法相比,这些结果显示出显著更低的背景噪声水平。我们还提出了在 2.1 微米处对 H2O 的新探测,以及在 2.3 微米处对行星夜侧 CO 的试探性探测。这代表了利用多普勒光谱学获得的关于系外行星夜侧发射光谱中分子吸收的首个观测证据。

英文摘要:

High-resolution Doppler spectroscopy provides an avenue to study the atmosphere of both transiting and non-transiting planets. This powerful method has also yielded some of the most robust atmospheric detections to date. Currently, high-resolution Doppler spectroscopy detects atmospheric signals by cross-correlating observed data with a model atmospheric spectrum. This technique has been successful in detecting various molecules such as H2O, CO, HCN and TiO, as well as several atomic species. Here we present an alternative method of performing high-resolution Doppler spectroscopy, using a technique known as Doppler tomography. We present an analysis of HD 179949 b using Doppler tomography and provide Doppler tomograms confirming previous detections of CO at 2.3 microns, and H2O at both 2.3 microns, and 3.5 microns within the atmosphere of HD 179949 b, showing significantly lower background noise levels when compared to cross-correlation methods applied to the same data. We also present a novel detection of H2O at 2.1 microns, as well as a tentative detection of CO on the night side of the planet at 2.3 microns. This represents the first observational evidence for molecular absorption in the night-side emission spectrum of an exoplanet using Doppler spectroscopy.

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