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ULTRACAM z′-band detection of the secondary eclipse of WASP-12b.

Föhring, D. and Dhillon, V.S. and Madhusudhan, N. and Marsh, T.R. and Copperwheat, C.M. and Littlefair, S.P. and Wilson, R.W. (2013) 'ULTRACAM z′-band detection of the secondary eclipse of WASP-12b.', Monthly notices of the Royal Astronomical Society., 435 (3). pp. 2268-2273.


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.

Item Type:Article
Keywords:Techniques: photometric, Stars: individual: WASP-12, Planetary systems.
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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Record Created:21 Oct 2015 16:35
Last Modified:22 Oct 2015 09:50

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