HST PanCET program: A Cloudy Atmosphere for the Promising JWST Target WASP-101b - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Letters Year : 2017

HST PanCET program: A Cloudy Atmosphere for the Promising JWST Target WASP-101b

H. R. Wakeford
  • Function : Author
K. B. Stevenson
  • Function : Author
N. K. Lewis
  • Function : Author
D. K. Sing
  • Function : Author
M. López-Morales
  • Function : Author
M. Marley
  • Function : Author
T. Kataria
  • Function : Author
A. Mandell
  • Function : Author
G. E. Ballester
  • Function : Author
J. Barstow
  • Function : Author
V. Bourrier
  • Function : Author
L. A. Buchhave
  • Function : Author
D. Ehrenreich
  • Function : Author
T. Evans
  • Function : Author
A. García Muñoz
  • Function : Author
G. Henry
  • Function : Author
H. Knutson
  • Function : Author
P. Lavvas
N. Nikolov
  • Function : Author
J. Sanz-Forcada
  • Function : Author

Abstract

We 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 13σ. 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.

Dates and versions

insu-03747485 , version 1 (08-08-2022)

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Cite

H. R. Wakeford, K. B. Stevenson, N. K. Lewis, D. K. Sing, M. López-Morales, et al.. HST PanCET program: A Cloudy Atmosphere for the Promising JWST Target WASP-101b. The Astrophysical Journal Letters, 2017, 835, ⟨10.3847/2041-8213/835/1/L12⟩. ⟨insu-03747485⟩
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