The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint
Name:
Wakeford_2018_AJ_155_29.pdf
Size:
2.456Mb
Format:
PDF
Description:
Final Published Version
Author
Wakeford, H. R.
Sing, D. K.

Deming, D.
Lewis, N. K.

Goyal, J.
Wilson, T. J.
Barstow, J.

Kataria, T.

Drummond, B.

Evans, T. M.

Carter, A. L.
Nikolov, N.
Knutson, H. A.
Ballester, G. E.
Mandell, A. M.

Affiliation
Univ Arizona, Lunar & Planetary LabIssue Date
2017-12-20Keywords
planets and satellites: atmospheresplanets and satellites: individual (WASP-39b)
techniques: spectroscopic
Metadata
Show full item recordPublisher
IOP PUBLISHING LTDCitation
The Complete Transmission Spectrum of WASP-39b with a Precise Water Constraint 2017, 155 (1):29 The Astronomical JournalJournal
The Astronomical JournalRights
© 2017. The American Astronomical Society. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
WASP-39b is a hot Saturn-mass exoplanet with a predicted clear atmosphere based on observations in the optical and infrared. Here, we complete the transmission spectrum of the atmosphere with observations in the near-infrared (NIR) over three water absorption features with the Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) G102 (0.8-1.1 mu m) and G141 (1.1-1.7 mu m) spectroscopic grisms. We measure the predicted high-amplitude H2O feature centered at 1.4 mu m and the smaller amplitude features at 0.95 and 1.2 mu m, with a maximum water absorption amplitude of 2.4 planetary scale heights. We incorporate these new NIR measurements into previously published observational measurements to complete the transmission spectrum from 0.3 to 5 mu m. From these observed water features, combined with features in the optical and IR, we retrieve a well constrained temperature T-eq = 1030(20)(+30) K, and atmospheric metallicity 151(46) (+48) solar, which is relatively high with respect to the currently established mass-metallicity trends. This new measurement in the Saturn-mass range hints at further diversity in the planet formation process relative to our solar system giants.ISSN
1538-3881Version
Final published versionSponsors
European Research Council (ERC) under the European Unions Seventh Framework Programme (FP7)/ERC grant [336792]; Leverhulme Trust; STFC; Giacconi Fellowship at the Space Telescope Science Institute by the Association of Universities for Research in Astronomy, Inc.; [GO-14169]; [GO-14260]Additional Links
http://stacks.iop.org/1538-3881/155/i=1/a=29?key=crossref.514ec2fba37ccb9b9b304f11dc745af0ae974a485f413a2113503eed53cd6c53
10.3847/1538-3881/aa9e4e