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arXiv 2607.03992astro-ph.EP
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利用K波段高分辨率光谱对六颗超热木星进行大气特征分析

Atmospheric characterization of six ultra-hot Jupiters from $K$-band high-resolution spectroscopy

University of California, Los Angeles(加州大学洛杉矶分校);California Institute of Technology(加州理工学院);University of Pennsylvania(宾夕法尼亚大学);Jet Propulsion Laboratory(喷气推进实验室)
Luke Finnerty, Michael P. Fitzgerald, Yinzi Xin, Jerry W. Xuan, Julie Inglis, Shubh Agrawal, Ashley Baker, Randall Bartos, Geoffrey A. Blake, Benjamin Calvin, S… 展开作者

Luke Finnerty, Michael P. Fitzgerald, Yinzi Xin, Jerry W. Xuan, Julie Inglis, Shubh Agrawal, Ashley Baker, Randall Bartos, Geoffrey A. Blake, Benjamin Calvin, Sylvain Cetre, Jacques-Robert Delorme, Greg Doppmann, Daniel Echeverri, Katelyn Horstman, Chih-Chun Hsu, Nemanja Jovanovic, Joshua Liberman, Ronald A. López, Dimitri Mawet, Evan Morris, Jacklyn Pezzato-Rovner, Jean-Baptiste Ruffio, Ben Sappey, Tobias Schofield, Andrew Skemer, J. Kent Wallace, Nicole L. Wallack, Jason J. Wang, Ji Wang

AI总结:

通过凯克/KPIC高分辨率光谱检测超热木星,对其进行大气反演分析,获取压力-温度剖面等参数,结果显示解离限制对水和羟基丰度的约束,强调宽光谱覆盖对高分辨率反演的重要性。

摘要:

我们展示了在K波段对三颗超热木星(UHJs):WASP-189b(SNR = 7.2)、MASCARA-1b(SNR = 8.6)和TOI-1518b(SNR = 7.1)的新的凯克/KPIC高分辨率光谱探测,以及对KELT-9b(SNR = 5.0)的初步探测。对这些天体以及之前报告的WASP-33b(SNR = 11.2)和KELT-20b(SNR = 10.5)的KPIC观测进行了统一的大气反演分析……

英文摘要:

We present new Keck/KPIC high-resolution spectroscopic detections of three ultra-hot Jupiters (UHJs) in the $K$ band: WASP-189b ($\rm SNR = 7.2$), MASCARA-1b ($\rm SNR = 8.6$), and TOI-1518b ($\rm SNR = 7.1$), as well as a tentative detection of KELT-9b ($\rm SNR = 5.0$). We perform a uniform set of atmospheric retrieval analysis on these objects, as well as previously reported KPIC observations of WASP-33b ($\rm SNR = 11.2$) and KELT-20b ($\rm SNR = 10.5$), We perform atmospheric retrievals for the pressure-temperature ($P-T$) profile, orbital velocity parameters, $v\sin i$, and abundances of CO, H$_2$O, OH, and Fe, with parameterized mixing profiles to account for the expected vertical abundance variations of H$_2$O and OH. We also perform a set of retrievals assuming chemical equilibrium, which are generally in good agreement with the free retrievals. Except for \knb, the retrieved spectra are dominated by CO emission features, with additional weak H$_2$O or OH features consistent with thermal dissociation of H$_2$O. \knb, which is significantly hotter, appears to have very weak molecular features. Dissociation limits our ability to reliably constrain H$_2$O or OH abundances from $K$ band data alone, resulting in poor constraints on the C/O ratio. For all objects, the atmospheric abundances from detected carbon and oxygen species are $1-10\times$ solar. These results highlight the importance of wide spectral coverage for high-resolution retrievals. Additional observations to expand phase and wavelength coverage are needed to better constrain oxygen species and possible spatial inhomogeneities from dissociation.

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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