The Library
Transmission spectroscopy of the inflated exoplanet WASP-52b, and evidence for a bright region on the stellar surface
Tools
Tools
Tools
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
![[img]](http://wrap.warwick.ac.uk/style/images/fileicons/application_pdf.png) |
PDF
WRAP_MNRAS-2016-Kirk-2922-31.pdf - Published Version - Requires a PDF viewer. Download (2148Kb) |
Official URL: http://dx.doi.org/10.1093/mnras/stw2205
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: |
|
||||||||
| 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) |
Request changes or add full text files to a record
Repository staff actions (login required)
 |
View Item |
Downloads
Downloads per month over past year
