热木星TrES-3 b的透射光谱学：一个过大的类瑞利特征的反证
Transmission spectroscopy of the hot Jupiter TrES-3 b: Disproof of an overly large Rayleigh-like feature
摘要：
上下文太阳系外行星的凌日事件提供了研究其大气组成的机会。先前对近距离气体巨星TrES-3 b的透射光谱的研究显示，在大气压力标度高度方面，对蓝色波长的吸收增加了非常大的幅度，这太大了，以至于无法用行星大气中的瑞利散射来解释。目的。我们提出了一个后续的研究热木星TrES-3 b的光学透射光谱，以调查由以前的研究发现的短波长的不透明度的强烈增加。此外，我们的目标是估计恒星斑点的透射光谱的影响。方法.这项工作使用先前公布的长缝光谱过境数据的大加那利望远镜（GTC）和公布的宽带观测以及新的观测在不同的波段从近紫外到近红外，均匀的过境光曲线分析。此外，还对TrES-3的主星进行了长期的光度监测。结果我们新分析的GTC光谱过境观测表明，比以前的研究低得多的幅度的斜率。我们从我们的结果中得出结论，先前报道的增加信号朝向短波长不是TrES-3系统固有的。此外，宽带光谱有利于平坦光谱。长期的光度监测排除了未被遮蔽的星点对透射光谱的重大修改。
英文摘要：
Context. Transit events of extrasolar planets offer the opportunity to study the composition of their atmospheres. Previous work on transmission spectroscopy of the close-in gas giant TrES-3 b revealed an increase in absorption towards blue wavelengths of very large amplitude in terms of atmospheric pressure scale heights, too large to be explained by Rayleigh-scattering in the planetary atmosphere. Aims. We present a follow-up study of the optical transmission spectrum of the hot Jupiter TrES-3 b to investigate the strong increase in opacity towards short wavelengths found by a previous study. Furthermore, we aim to estimate the effect of stellar spots on the transmission spectrum. Methods. This work uses previously published long slit spectroscopy transit data of the Gran Telescopio Canarias (GTC) and published broad band observations as well as new observations in different bands from the near-UV to the near-IR, for a homogeneous transit light curve analysis. Additionally, a long-term photometric monitoring of the TrES-3 host star was performed. Results. Our newly analysed GTC spectroscopic transit observations show a slope of much lower amplitude than previous studies. We conclude from our results the previously reported increasing signal towards short wavelengths is not intrinsic to the TrES-3 system. Furthermore, the broad band spectrum favours a flat spectrum. Long-term photometric monitoring rules out a significant modification of the transmission spectrum by unocculted star spots.
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