HST PanCET Program: A Cloudy Atmosphere for the Promising JWST Target WASP-101b
AuthorWakeford, H. R.
Stevenson, K. B.
Lewis, N. K.
Sing, D. K.
Ballester, G. E.
Buchhave, Lars A.
García Muñoz, A.
Lecavelier des Etangs, A.
AffiliationUniv Arizona, Dept Planetary Sci
Univ Arizona, Lunar & Planetary Lab
Keywordsplanets and satellites: atmospheres
planets and satellites: individual (WASP-101b)
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationHST PanCET Program: A Cloudy Atmosphere for the Promising JWST Target WASP-101b 2017, 835 (1):L12 The Astrophysical Journal
JournalThe Astrophysical Journal
Rights© 2017. The American Astronomical Society. All rights reserved.
Collection InformationThis 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 email@example.com.
AbstractWe present results from the first observations of the Hubble Space Telescope (HST) Panchromatic Comparative Exoplanet Treasury program for WASP-101b, a highly inflated hot Jupiter and one of the community targets proposed for the James Webb Space Telescope (JWST) Early Release Science (ERS) program. From a single HST Wide Field Camera 3 observation, we find that the near-infrared transmission spectrum of WASP-101b contains no significant H2O absorption features and we rule out a clear atmosphere at 13 sigma. Therefore, WASP-101b is not an optimum target for a JWST ERS program aimed at observing strong molecular transmission features. We compare WASP-101b to the well-studied and nearly identical hot Jupiter WASP-31b. These twin planets show similar temperature-pressure profiles and atmospheric features in the near-infrared. We suggest exoplanets in the same parameter space as WASP-101b and WASP-31b will also exhibit cloudy transmission spectral features. For future HST exoplanet studies, our analysis also suggests that a lower count limit needs to be exceeded per pixel on the detector in order to avoid unwanted instrumental systematics.
VersionFinal published version
SponsorsNASA [NAS 5-26555]; NASA Postdoctoral Program at Goddard Space Flight Center; European Research Council under the European Unions Seventh Framework Programme/ERC ; Royal Astronomical Society Research Fellowship; National Centre for Competence in Research "PlanetS" - Swiss National Science Foundation (SNSF); CNES (France) under project PACES; [GO-14767]