Optical transmission photometry of the highly inflated exoplanet WASP-17b
Optical transmission photometry of the highly inflated exoplanet WASP-17b
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DOI：
10.1093/mnras/stt1979
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发表时间：
2013-10
影响因子：
4.8
通讯作者：
J. Bento;P. Wheatley;C. Copperwheat;J. Fortney;V. Dhillon;R. Hickman;S. Littlefair;T. Marsh;S. Parsons;J. Southworth
中科院分区：
文献类型：
--
作者：
J. Bento;P. Wheatley;C. Copperwheat;J. Fortney;V. Dhillon;R. Hickman;S. Littlefair;T. Marsh;S. Parsons;J. Southworth
我们提出了基于地面的高精度观测的过境WASP-17 b使用ESO的新技术望远镜（NTT）的多波段光度计ULTRACAM在执行透射分光光度法的背景下，这个高度膨胀的系外行星。我们选择的滤光片（SDSS u′，g′和r′波段）是为了探测高层大气中不透明度源的存在。我们在SDSS r′波段的增强吸收中发现了行星半径依赖波长的证据，这与先前检测到的宽钠特征一致。我们提出了一个新的独立测量的行星半径Rpl = 1.97 ± 0.06RJ，这证实了这颗行星是迄今为止已知的最膨胀的系外行星。我们的测量结果是最一致的大气剖面没有增强TiO不透明度，以前预测是目前为这颗行星。
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.