Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 437, Issue 2, Pages 1511-1518Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stt1979
Keywords
stars: individual: WASP-17; stars: planetary systems
Categories
Funding
- Australian Research Council [DP120103751]
- Science and Technology Facilities Council (STFC) [ST/F002599/1, PP/D002370/1, PP/E001777/1]
- Joint Committee ESO-Government of Chile
- STFC [PP/D002370/1, PP/E001777/1, ST/H005307/1, ST/F002599/1, ST/M002012/1, ST/K002783/1, ST/J001589/1, ST/I001719/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/K002783/1, PP/E001777/1, PP/D002370/1, ST/J001589/1, ST/I001719/1, ST/H005307/1, ST/M002012/1, ST/F002599/1] Funding Source: researchfish
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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 R-pl = 1.97 +/- 0.06R(J), 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.
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