Another look at the dayside spectra of WASP-43b and HD 209458b: are there scattering clouds?

Abstract

The search for clouds on the dayside of hot Jupiters has been disadvantaged due to hot Jupiters having a limited number of high quality space-based observations. To date, retrieval studies have found no evidence for grey clouds on the dayside, however none of these studies explored the impact of scattering clouds. In this study we reanalyse the dayside emission spectrum of the hot Jupiter WASP-43b considering the different Spitzer data in the literature. We find that, in 2 of the 4 data sets explored, retrieving with a model that contains a scattering cloud is favoured over a cloud free model by a confidence of 3.13 - 3.36 $\sigma$. The other 2 data sets finds no evidence for scattering clouds. We find that the retrieved H${}_2$O abundance is consistent regardless of the Spitzer data used and is consistent with literature values. We perform the same analysis for the hot Jupiter HD 209458b and find no evidence for dayside clouds, consistent with previous studies.

7 pages, 6 figures. Accepted for publication with MNRAS

References in corpus (18)

• Bayes in the sky: Bayesian inference and model selection in cosmology
• A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
• Thermal structure of an exoplanet atmosphere from phase-resolved emission spectroscopy
• ExoMol molecular line lists XXXV: a rotation-vibration line list for hot ammonia
• ExoMol line lists -- XXXIX. Ro-vibrational molecular line list for CO${}_2$
• Spitzer Phase Curve Constraints for WASP-43b at 3.6 and 4.5 microns
• The ExoMolOP Database: Cross-sections and k-tables for Molecules of Interest in High-Temperature Exoplanet Atmospheres
• New Analysis Indicates No Thermal Inversion in the Atmosphere of HD 209458b
• The cloudy shape of hot Jupiter thermal phase curves
• Retrieval of Exoplanet Emission Spectra with HyDRA
• Clouds in Three-Dimensional Models of Hot Jupiters Over a Wide Range of Temperatures I: Thermal Structures and Broadband Phase Curve Predictions
• Understanding and Mitigating Biases when Studying Inhomogeneous Emission Spectra with JWST
• On The Compatibility of Ground-based and Space-based Data: WASP-96 b, An Example
• 2D Retrieval Frameworks for Hot Jupiter Phase Curves
• Introducing a New Spitzer Master BLISS Map to Remove the Instrument-Systematic -- Phase-Curve-Parameter Degeneracy, as Demonstrated by a Reanalysis of the 4.5$\mu m$ WASP-43b Phase Curve
• An exploration of model degeneracies with a unified phase curve retrieval analysis: The light and dark sides of WASP-43 b
• How Does Thermal Scattering Shape the Infrared Spectra of Cloudy Exoplanets? A Theoretical Framework and Consequences for Atmospheric Retrievals in the JWST era
• Bayesian analysis of exoplanet and binary orbits

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