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arXiv 2102.00211astro-ph.EP
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HD149026b大气中的中性金属

Neutral metals in the atmosphere of HD149026b

Masato Ishizuka, Hajime Kawahara, Stevanus K. Nugroho, Yui Kawashima, Teruyuki Hirano, Motohide Tamura

摘要:

高色散光谱学的最新进展揭示了日面温度大于2000 K的高温超导体(UHJ)大气中存在蒸发的重金属和离子。利用斯巴鲁望远镜获得的高分辨率透射光谱的档案数据,我们在HD 149026 b中寻找中性金属,这是一个比UHJ更冷的热木星。通过去除恒星和大地吸收,并使用互相关技术,我们报告尝试检测中性钛与4.4西格玛和中性铁与2.8西格玛在大气中的边缘信号。这是第一次在系外行星大气中探测到中性钛。在该温度范围内,钛倾向于形成氧化钛(TiO)。我们没有探测到TiO的任何信号,这表明大气中的C/O比高于太阳值。在温度低于UHJ的热彗星大气中探测到金属元素,将有助于了解热彗星的大气结构和形成历史。

英文摘要:

Recent progress in high-dispersion spectroscopy has revealed the presence of vaporized heavy metals and ions in the atmosphere of hot Jupiters whose dayside temperature is larger than 2000 K, categorized as ultra hot Jupiters (UHJs). Using the archival data of high resolution transmission spectroscopy obtained with the Subaru telescope, we searched for neutral metals in HD149026b, a hot Jupiter cooler than UHJs. By removing stellar and telluric absorption and using a cross-correlation technique, we report tentative detection of neutral titanium with 4.4 sigma and a marginal signal of neutral iron with 2.8 sigma in the atmosphere. This is the first detection of neutral titanium in an exoplanetary atmosphere. In this temperature range, titanium tends to form titanium oxide (TiO). The fact that we did not detect any signal from TiO suggests that the C/O ratio in the atmosphere is higher than the solar value. The detection of metals in the atmosphere of hot Jupiters cooler than UHJs will be useful for understanding the atmospheric structure and formation history of hot Jupiters.

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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