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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 |
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| 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: | 20 Apr 2022 09:28 |
| DOI or ID number: | 10.1093/mnras/stw2205 |
| URI: | https://researchonline.ljmu.ac.uk/id/eprint/6261 |
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