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.

引用

页数：7

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