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Durham University

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Publication details for Dr Richard Wilson

Föhring, D., Dhillon, V.S., Madhusudhan, N., Marsh, T.R., Copperwheat, C.M., Littlefair, S.P. & Wilson, R.W. (2013). ULTRACAM z′-band detection of the secondary eclipse of WASP-12b. Monthly Notices of the Royal Astronomical Society 435(3): 2268-2273.

Author(s) from Durham

Abstract

We present z′-band secondary eclipse photometry of the highly irradiated hot Jupiter WASP-12b using ULTRACAM on the 4.2 m William Herschel Telescope. We measure a decrease in flux of δ = 0.130 ± 0.013 per cent during the passage of the planet behind the star, which is significantly deeper than the previous measurement at this wavelength (0.082 ± 0.015 per cent). Our secondary eclipse is best fitted with a mid-eclipse phase, ϕ, that is compatible with a circular orbit ϕ = 0.501 ± 0.002, in agreement with previous results. In combination with existing data, our eclipse depth measurement allows us to constrain the characteristics of the planet's atmosphere, which is consistent with a carbon-rich model, with no evidence for a strong thermal inversion. If the difference in eclipse depth reported here compared to that of López-Morales et al. is of physical origin, as opposed to due to systematics, it may be caused by temporal variability in the flux, due to atmospheric dynamics.