Delrez, L and Madhusudhan, N and Lendl, M and Gillon, M and Anderson, DR and Neveu-VanMalle, M and Bouchy, F and Burdanov, A and Collier-Cameron, A and Demory, B-O and Hellier, C and Jehin, E and Magain, P and Maxted, PFL and Queloz, D and Smalley, B and Triaud, AHMJ (2017) High-precision multi-wavelength eclipse photometry of the ultra-hot gas giant exoplanet WASP-103 b. Monthly Notices of the Royal Astronomical Society. ISSN 1365-2966

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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-σ) and 3567+400 −350 ppm (10.2-σ), 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.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2017 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: planetary systems, planets and satellites, atmospheres, stars, individual, WASP-103, techniques, photometric techniques, radial velocities
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Depositing User: Symplectic
Date Deposited: 14 Nov 2017 09:41
Last Modified: 14 Nov 2017 09:41

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