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Optical transmission photometry of the highly inflated exoplanet WASP-17b
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Bento, J., Wheatley, Peter J., Copperwheat, C. M., Fortney, J. J., Dhillon, V. S., Hickman, R. D. G. (Richard D. G.), Littlefair, S. P., Marsh, Tom, Parsons, S. G. and Southworth, J. (2014) Optical transmission photometry of the highly inflated exoplanet WASP-17b. Monthly Notices of the Royal Astronomical Society, Volume 437 (Number 2). pp. 1511-1518. doi:10.1093/mnras/stt1979 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt1979
Abstract
We present ground-based high-precision observations of the transit of WASP-17b using the multiband photometer ULTRACAM on ESO's New Technology Telescope (NTT) in the context of performing transmission spectrophotometry of this highly inflated exoplanet. Our choice of filters (SDSS u′, g′ and r′ bands) is designed to probe for the presence of opacity sources in the upper atmosphere. We find evidence for a wavelength dependence in the planet radius in the form of enhanced absorption in the SDSS r′ band, consistent with a previously detected broad sodium feature. We present a new independent measurement of the planetary radius at Rpl = 1.97 ± 0.06RJ, which confirms this planet as the most inflated exoplanet known to date. Our measurements are most consistent with an atmospheric profile devoid of enhanced TiO opacity, previously predicted to be present for this planet.
| 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: | 2014 | ||||
| Dates: |
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| Volume: | Volume 437 | ||||
| Number: | Number 2 | ||||
| Page Range: | pp. 1511-1518 | ||||
| DOI: | 10.1093/mnras/stt1979 | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access |
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