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arXiv · 2303.13732

Thermal Emission from the hot Jupiter WASP-103b in J and Ks Bands

Yaqing Shi·Wei Wang·Gang Zhao·Meng Zhai·Guo Chen·Zewen Jiang·Qinglin Ouyang·Thomas Henning·Jingkun Zhao·Nicolas Crouzet·Roy van Boekel
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Abstract

Hot Jupiters, particularly those with temperature higher than 2000 K are the best sample of planets that allow in-depth characterization of their atmospheres. We present here a thermal emission study of the ultra hot Jupiter WASP-103 b observed in two secondary eclipses with CFHT/WIRCam in J and Ks bands. By means of high precision differential photometry, we determine eclipse depths in J and Ks to an accuracy of 220 and 270 ppm, which are combined with the published HST/WFC3 and Spitzer data to retrieve a joint constraints on the properties of WASP-103 b dayside atmosphere. We find that the atmosphere is best fit with a thermal inversion layer included. The equilibrium chemistry retrieval indicates an enhanced C/O (1.35$^{+0.14}_{-0.17}$) and a super metallicity with [Fe/H]$=2.19^{+0.51}_{-0.63}$ composition. Given the near-solar metallicity of WASP-103 of [Fe/H]=0.06, this planet seems to be $\sim$100 more abundant than its host star. The free chemistry retrieval analysis yields a large abundance of FeH, H$^{-}$, CO$_2$ and CH$_4$. Additional data of better accuracy from future observations of JWST should provide better constraint of the atmospheric properties of WASP-103b.

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Yaqing Shi, Wei Wang, Gang Zhao, Meng Zhai, Guo Chen, Zewen Jiang, Qinglin Ouyang, Thomas Henning, Jingkun Zhao, Nicolas Crouzet, Roy van Boekel. 2023-03-31. Thermal Emission from the hot Jupiter WASP-103b in J and Ks Bands. https://doi.org/10.1093/mnras%2Fstad891

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