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Transmission spectroscopy of the inflated exoplanet WASP-52b, and evidence for a bright region on the stellar surface

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Kirk, James, Wheatley, Peter J., Louden, Tom M., Littlefair, S. P., Copperwheat, C. M., Armstrong, David J., Marsh, Tom and Dhillon, V. S. (2016) Transmission spectroscopy of the inflated exoplanet WASP-52b, and evidence for a bright region on the stellar surface. Monthly Notices of the Royal Astronomical Society, 463 (3). pp. 2922-2931. doi:10.1093/mnras/stw2205

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Official URL: http://dx.doi.org/10.1093/mnras/stw2205

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Abstract

We have measured the transmission spectrum of the extremely inflated hot Jupiter WASP-52b using simultaneous photometric observations in Sloan Digital Sky Survey u′, g′ and a filter centred on the sodium doublet (Na I) with the ULTRACAM instrument mounted on the 4.2-m William Herschel Telescope. We find that Rayleigh scattering is not the dominant source of opacity within the planetary atmosphere and find a transmission spectrum more consistent with wavelength-independent opacity such as from clouds. We detect an in-transit anomaly that we attribute to the presence of stellar activity and find that this feature can be more simply modelled as a bright region on the stellar surface akin to solar faculae rather than spots. A spot model requires a significantly larger planet/star radius ratio than that found in previous studies. Our results highlight the precision that can be achieved by ground-based photometry with errors in the scaled planetary radii of less than one atmospheric scale height, comparable to Hubble Space Telescope observations.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Stars, Planetary systems, Starspots
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: 11 December 2016
Dates:
DateEvent
11 December 2016Published
2 September 2016Available
31 August 2016Accepted
Volume: 463
Number: 3
Page Range: pp. 2922-2931
DOI: 10.1093/mnras/stw2205
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
Funder: Science and Technology Facilities Council (Great Britain) (STFC), Seventh Framework Programme (European Commission) (FP7)
Grant number: ST/L00073, ST/M001350 (STFC), Grant no. 313014 ETAEARTH (FP7)

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