Evidence for a Dayside Thermal Inversion and High Metallicity for the Hot Jupiter WASP-18b

被引：80
|
作者：
Sheppard, Kyle B. [1 ,2 ]
Mandell, Avi M. [2 ]
Tamburo, Patrick [2 ,3 ]
Gandhi, Siddharth [4 ]
Pinhas, Arazi [4 ]
Madhusudhan, Nikku [4 ]
Deming, Drake [1 ]
机构：
[1] Univ Maryland, Dept Astron, College Pk, MD 20742 USA
[2] NASA, Goddard Space Flight Ctr, Solar Syst Explorat Div, Greenbelt, MD 20771 USA
[3] Boston Univ, Dept Astron, Boston, MA 02215 USA
[4] Univ Cambridge, Inst Astron, Cambridge, England
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2017年 / 850卷 / 02期
基金：
英国科学技术设施理事会;
关键词：
planets and satellites: atmospheres; planets and satellites: composition; planets and satellites: gaseous planets; planets and satellites: individual (WASP-18b); EXOPLANET ATMOSPHERES; EMISSION-SPECTRA; LIGHT CURVES; PLANETS; INFERENCE; DATABASE; MODELS;
D O I：
10.3847/2041-8213/aa9ae9
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We find evidence for a strong thermal inversion in the dayside atmosphere of the highly irradiated hot Jupiter WASP-18b (T-eq = 2411 K, M = 10.3 M-J) based on emission spectroscopy from Hubble Space Telescope secondary eclipse observations and Spitzer eclipse photometry. We demonstrate a lack of water vapor in either absorption or emission at 1.4 mu m. However, we infer emission at 4.5 mu m and absorption at 1.6 mu m that we attribute to CO, as well as a non-detection of all other relevant species (e.g., TiO, VO). The most probable atmospheric retrieval solution indicates a C/O ratio of 1 and a high metallicity (C/H = 283(-138)(+395) solar). The derived composition and T/P profile suggest that WASP-18b is the first example of both a planet with a non-oxide driven thermal inversion and a planet with an atmospheric metallicity inconsistent with that predicted for Jupiter-mass planets at > 2 sigma. Future observations are necessary to confirm the unusual planetary properties implied by these results.
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页数：7
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