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ULTRACAM z'-band detection of the secondary eclipse of WASP-12b
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Fohring, D., Dhillon, V. S., Madhusudhan, N., Marsh, Tom, Copperwheat, C. M., 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 , Volume 435 (Number 3). pp. 2268-2273. doi:10.1093/mnras/stt1443 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt1443
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.
| Item Type: | Journal Article | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
| Publisher: | Oxford University Press | ||||||||||
| ISSN: | 0035-8711 | ||||||||||
| Official Date: | 2013 | ||||||||||
| Dates: |
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| Volume: | Volume 435 | ||||||||||
| Number: | Number 3 | ||||||||||
| Page Range: | pp. 2268-2273 | ||||||||||
| DOI: | 10.1093/mnras/stt1443 | ||||||||||
| Status: | Peer Reviewed | ||||||||||
| Publication Status: | Published | ||||||||||
| Access rights to Published version: | Restricted or Subscription Access |
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