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High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b

Smalley; Hellier; Maxted

High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b Thumbnail


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Abstract

We present sixteen occultation and three transit light curves for the ultra-short period hot Jupiter WASP-103b, in addition to five new radial velocity measurements. We combine these observations with archival data and perform a global analysis of the resulting extensive dataset, accounting for the contamination from a nearby star. We detect the thermal emission of the planet in both the z 0 and KS-bands, the measured occultation depths being 699±110 ppm (6.4-s) and 3567+400 -350 ppm (10.2-s), respectively. We use these two measurements together with recently published HST/WFC3 data to derive joint constraints on the properties of WASP-103b’s dayside atmosphere. On one hand, we find that the z 0 -band and WFC3 data are best fit by an isothermal atmosphere at 2900 K or an atmosphere with a low H2O abundance. On the other hand, we find an unexpected excess in the KS-band measured flux compared to these models, which requires confirmation with additional observations before any interpretation can be given. From our global data analysis, we also derive a broad-band optical transmission spectrum that shows a minimum around 700 nm and increasing values towards both shorter and longer wavelengths. This is in agreement with a previous study based on a large fraction of the archival transit light curves used in our analysis. The unusual profile of this transmission spectrum is poorly matched by theoretical spectra and is not confirmed by more recent observations at higher spectral resolution. Additional data, both in emission and transmission, are required to better constrain the atmospheric properties of WASP-103b.

Acceptance Date Nov 13, 2017
Publication Date Nov 13, 2017
Publicly Available Date Mar 28, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Oxford University Press
Pages 2334-2351
DOI https://doi.org/10.1093/mnras/stx2896
Keywords planetary systems, planets and satellites, atmospheres, stars, individual, WASP-103, techniques, photometric techniques, radial velocities
Publisher URL https://doi.org/10.1093/mnras/stx2896

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