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

Kirk, J, Wheatley, PJ, Louden, T, Littlefair, SP, Copperwheat, CM, Armstrong, DJ, Marsh, TR and Dhillon, VS (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). ISSN 0035-8711

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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: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2016 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical And Space Sciences
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: OXFORD UNIV PRESS
Related URLs:
Date Deposited: 13 Apr 2017 12:51
Last Modified: 07 Sep 2018 16:07
DOI or Identification number: 10.1093/mnras/stw2205
URI: http://researchonline.ljmu.ac.uk/id/eprint/6261

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