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

Föhring, D.; Dhillon, V.S.; Madhusudhan, N.; Marsh, T.R.; Copperwheat, C.M.; Littlefair, S.P.; Wilson, R.W.

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D. Föhring

V.S. Dhillon

N. Madhusudhan

T.R. Marsh

C.M. Copperwheat

S.P. Littlefair


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.


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

Journal Article Type Article
Acceptance Date Aug 1, 2013
Publication Date Nov 1, 2013
Deposit Date Oct 15, 2015
Publicly Available Date Oct 22, 2015
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 435
Issue 3
Pages 2268-2273
Keywords Techniques: photometric, Stars: individual: WASP-12, Planetary systems.


Published Journal Article (831 Kb)

Copyright 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.

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