HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b
HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b
We present an optical transmission spectrum of the hot Jupiter WASP-101b. We observed three primary transits with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph, covering a wavelength range from 0.3 to 1 m. The observations suffer from significant systematics that we model using Gaussian Processes. Kernel selection for the Gaussian Processes is performed in a data-driven approach through Bayesian model comparison. We find a flat and featureless transmission spectrum, corroborating a previous measurement obtained with HST/Wide-Field Camera 3 in the 1–1.7 m range. The spectrum is consistent with high-altitude clouds located at less than 100 bar. This cloud layer completely blocks our view into deeper parts of the atmosphere and makes WASP-101b the cloudiest gas giant observed so far. We compute a series of temperature-pressure profiles for WASP-101b and compare these to condensation curves for cloud particles, which match clouds composed of silicates. We also include 13 transits observed with Transiting Exoplanet Survey Satellite and use these to refine system parameters.
582-594
Rathcke, Alexander D.
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Buchhave, Lars A.
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Mendonça, João M.
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Sing, David K.
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López-Morales, Mercedes
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Alam, Munazza K.
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Henry, Gregory W.
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Nikolov, Nikolay K.
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Garćıa Muñoz, A.
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Mikal-Evans, Thomas
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Wakeford, Hannah R.
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Dos Santos, Leonardo A.
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Rajpaul, Vinesh Maguire
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17 April 2023
Rathcke, Alexander D.
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Buchhave, Lars A.
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Mendonça, João M.
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Sing, David K.
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López-Morales, Mercedes
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Alam, Munazza K.
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Henry, Gregory W.
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Nikolov, Nikolay K.
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Garćıa Muñoz, A.
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Mikal-Evans, Thomas
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Wakeford, Hannah R.
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Dos Santos, Leonardo A.
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Rajpaul, Vinesh Maguire
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Rathcke, Alexander D., Buchhave, Lars A., Mendonça, João M., Sing, David K., López-Morales, Mercedes, Alam, Munazza K., Henry, Gregory W., Nikolov, Nikolay K., Garćıa Muñoz, A., Mikal-Evans, Thomas, Wakeford, Hannah R., Dos Santos, Leonardo A. and Rajpaul, Vinesh Maguire
(2023)
HST PanCET programme: a flat optical transmission spectrum for the Hot Jupiter WASP-101b.
Monthly Notices Of The Royal Astronomical Society, 522 (1), .
(doi:10.1093/mnras/stad1010).
Abstract
We present an optical transmission spectrum of the hot Jupiter WASP-101b. We observed three primary transits with Hubble Space Telescope (HST)/Space Telescope Imaging Spectrograph, covering a wavelength range from 0.3 to 1 m. The observations suffer from significant systematics that we model using Gaussian Processes. Kernel selection for the Gaussian Processes is performed in a data-driven approach through Bayesian model comparison. We find a flat and featureless transmission spectrum, corroborating a previous measurement obtained with HST/Wide-Field Camera 3 in the 1–1.7 m range. The spectrum is consistent with high-altitude clouds located at less than 100 bar. This cloud layer completely blocks our view into deeper parts of the atmosphere and makes WASP-101b the cloudiest gas giant observed so far. We compute a series of temperature-pressure profiles for WASP-101b and compare these to condensation curves for cloud particles, which match clouds composed of silicates. We also include 13 transits observed with Transiting Exoplanet Survey Satellite and use these to refine system parameters.
Text
stad1010
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Accepted/In Press date: 28 March 2023
e-pub ahead of print date: 6 April 2023
Published date: 17 April 2023
Additional Information:
Correction Notice: a correction to this research output can be found at: https://doi.org/10.1093/mnras/stad1411
Identifiers
Local EPrints ID: 497549
URI: http://eprints.soton.ac.uk/id/eprint/497549
ISSN: 1365-2966
PURE UUID: 34bf07f8-8854-4d4d-bfc8-610a6a71a497
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Date deposited: 27 Jan 2025 17:52
Last modified: 22 Aug 2025 02:46
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Contributors
Author:
Alexander D. Rathcke
Author:
Lars A. Buchhave
Author:
João M. Mendonça
Author:
David K. Sing
Author:
Mercedes López-Morales
Author:
Munazza K. Alam
Author:
Gregory W. Henry
Author:
Nikolay K. Nikolov
Author:
A. Garćıa Muñoz
Author:
Thomas Mikal-Evans
Author:
Hannah R. Wakeford
Author:
Leonardo A. Dos Santos
Author:
Vinesh Maguire Rajpaul
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