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Rayleigh scattering in the transmission spectrum of HAT-P-18b

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Kirk, James, Wheatley, Peter J., Louden, Tom M., Doyle, A. P., Skillen, I., McCormac, J. J., Irwin, P. G. J. and Karjalainen, R. (2017) Rayleigh scattering in the transmission spectrum of HAT-P-18b. Monthly Notices of the Royal Astronomical Society, 468 (4). pp. 3907-3916. doi:10.1093/mnras/stx752

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Official URL: http://dx.doi.org/10.1093/mnras/stx752

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Abstract

We have performed ground-based transmission spectroscopy of the hot Jupiter HAT-P-18b using the ACAM instrument on the William Herschel Telescope (WHT). Differential spectroscopy over an entire night was carried out at a resolution of R ≈ 400 using a nearby comparison star. We detect a blueward slope extending across our optical transmission spectrum that runs from 4750 to 9250 Å. The slope is consistent with Rayleigh scattering at the equilibrium temperature of the planet (852 K). We do not detect enhanced sodium absorption, which indicates that a high-altitude haze is masking the feature and giving rise to the Rayleigh slope. This is only the second discovery of a Rayleigh-scattering slope in a hot Jupiter atmosphere from the ground, and our study illustrates how ground-based observations can provide transmission spectra with precision comparable to the Hubble Space Telescope.

Item Type: Journal Article
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Science > Physics
Library of Congress Subject Headings (LCSH): Extrasolar planets -- Atmospheres, Rayleigh scattering
Journal or Publication Title: Monthly Notices of the Royal Astronomical Society
Publisher: Oxford University Press
ISSN: 0035-8711
Official Date: 11 July 2017
Dates:
DateEvent
11 July 2017Published
28 March 2017Available
24 March 2017Accepted
Volume: 468
Number: 4
Page Range: pp. 3907-3916
DOI: 10.1093/mnras/stx752
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Restricted or Subscription Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
ST/L000733Science and Technology Facilities Councilhttp://dx.doi.org/10.13039/501100000271
UNSPECIFIEDRoyal Greenwich Observatory Isaac Newton Group of Telescopes (Santa Cruz de la Palma, Canary Islands)UNSPECIFIED

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