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题名: The GTC exoplanet transit spectroscopy survey VI. Detection of sodium in WASP-52b's cloudy atmosphere
作者: Chen, G.; Palle, E.; Nortmann, L.; Murgas, F.; Parviainen, H.; Nowak, G.
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 2017
卷号: 600, 页码:L11-
英文摘要: We report the first detection of sodium absorption in the atmosphere of the hot Jupiter WASP-52b. We observed one transit of WASP-52b with the low-resolution Optical System for Imaging and low-Intermediate-Resolution Integrated Spectroscopy (OSIRIS) at the 10.4 m Gran Telescopio Canarias (GTC). The resulting transmission spectrum, covering the wavelength range from 522 nm to 903 nm, is flat and featureless, except for the significant narrow absorption signature at the sodium doublet, which can be explained by an atmosphere in solar composition with clouds at 1 mbar. A cloud-free atmosphere is stringently ruled out. By assessing the absorption depths of sodium in various bin widths, we find that temperature increases towards lower atmospheric pressure levels, with a positive temperature gradient of 0.88 +/- 0.65 K km(-1), possibly indicative of upper atmospheric heating and a temperature inversion.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17327
Appears in Collections:暗物质和空间天文实验室_期刊论文

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