Rayleigh scattering in the transmission spectrum of HAT-P-18b

Rayleigh scattering in the transmission spectrum of HAT-P-18b
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HAT-P-18b 透射光谱中的瑞利散射

DOI:
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发表时间:
2016
期刊:
影响因子:
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通讯作者:
R. Karjalainen
R. Karjalainen
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文献类型:
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作者:
J. Kirk;P. Wheatley;T. Louden;A. Doyle;I. Skillen;J. McCormac;P. Irwin;R. Karjalainen

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我们使用威廉·赫歇尔望远镜 (WHT) 上的 ACAM 仪器对热木星 HAT-P-18b 进行了地面透射光谱分析。使用附近的对比星以 R ≈ 400 的分辨率进行了一整晚的差分光谱分析。我们检测到一个从 4750 A 延伸到 9250 A 的光学透射光谱上的向蓝斜率。该斜率与行星平衡温度 (852 K) 下的瑞利散射一致。我们没有检测到钠吸收增强,这表明高空雾霾掩盖了该特征并产生了瑞利斜率。这只是从地面在热木星大气层中第二次发现瑞利散射斜率,我们的研究说明了地面观测如何提供精度可与哈勃太空望远镜相媲美的透射光谱。
We have performed ground-based transmission spectroscopy of the hot Jupiter HAT-P-18b using the ACAM instrument on the William Herschel Telescope (WHT). Differential spectroscopy over an entire night was carried out at a resolution of R ≈ 400 using a nearby comparison star. We detect a blueward slope extending across our optical transmission spectrum that runs from 4750 to 9250 A. The slope is consistent with Rayleigh scattering at the equilibrium temperature of the planet (852 K). We do not detect enhanced sodium absorption, which indicates that a high-altitude haze is masking the feature and giving rise to the Rayleigh slope. This is only the second discovery of a Rayleigh-scattering slope in a hot Jupiter atmosphere from the ground, and our study illustrates how ground-based observations can provide transmission spectra with precision comparable to the Hubble Space Telescope.
DOI: 10.1051/0004-6361/201526313
发表时间: 2015-10
期刊: arXiv: Earth and Planetary Astrophysics
影响因子: --
作者:
H. Parviainen;E. Pall'e;L. Nortmann;G. Nowak;N. Iro;F. Murgas;S. Aigrain
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发表时间: 2011-07-01
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