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.
|Keywords:||Techniques: photometric, Stars: individual: WASP-12, Planetary systems.|
|Full text:||(VoR) Version of Record|
Download PDF (812Kb)
|Publisher Web site:||http://dx.doi.org/10.1093/mnras/stt1443|
|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|
|Social bookmarking:||Export: EndNote, Zotero | BibTex|
|Look up in GoogleScholar | Find in a UK Library|