Early Release Science of the exoplanet WASP-39b with JWST NIRCam

Abstract

Measuring the metallicity and carbon-to-oxygen (C/O) ratio in exoplanet atmospheres is a fundamental step towards constraining the dominant chemical processes at work and, if in equilibrium, revealing planet formation histories. Transmission spectroscopy provides the necessary means by constraining the abundances of oxygen- and carbon-bearing species; however, this requires broad wavelength coverage, moderate spectral resolution, and high precision that, together, are not achievable with previous observatories. Now that JWST has commenced science operations, we are able to observe exoplanets at previously uncharted wavelengths and spectral resolutions. Here we report time-series observations of the transiting exoplanet WASP-39b using JWST's Near InfraRed Camera (NIRCam). The long-wavelength spectroscopic and short-wavelength photometric light curves span 2.0 - 4.0 $\mu$m, exhibit minimal systematics, and reveal well-defined molecular absorption features in the planet's spectrum. Specifically, we detect gaseous H${}_2$O in the atmosphere and place an upper limit on the abundance of CH${}_4$. The otherwise prominent CO${}_2$ feature at 2.8 $\mu$m is largely masked by H${}_2$O. The best-fit chemical equilibrium models favour an atmospheric metallicity of 1-100$\times$ solar (i.e., an enrichment of elements heavier than helium relative to the Sun) and a sub-stellar carbon-to-oxygen (C/O) ratio. The inferred high metallicity and low C/O ratio may indicate significant accretion of solid materials during planet formation or disequilibrium processes in the upper atmosphere.

35 pages, 13 figures, 3 tables, Nature, accepted

References in corpus (42)

• The Transiting Exoplanet Survey Satellite
• Bayes in the sky: Bayesian inference and model selection in cosmology
• A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
• Early Release Science of the exoplanet WASP-39b with JWST NIRSpec PRISM
• Early Release Science of the Exoplanet WASP-39b with JWST NIRSpec G395H
• Fingering convection and cloudless models for cool brown dwarf atmospheres
• Dynamics and Disequilibrium Carbon Chemistry in Hot Jupiter Atmospheres, With Application to HD 209458b
• Early Release Science of the exoplanet WASP-39b with JWST NIRISS
• Mass-Metallicity Trends in Transiting Exoplanets from Atmospheric Abundances of H${}_2$O, Na, and K
• exoplanet: Gradient-based probabilistic inference for exoplanet data & other astronomical time series
• Identification of carbon dioxide in an exoplanet atmosphere
• A solar C/O and sub-solar metallicity in a hot Jupiter atmosphere
• Exoplanet Reflected Light Spectroscopy with PICASO
• The Complete transmission spectrum of WASP-39b with a precise water constraint
• The Effects of Consistent Chemical Kinetics Calculations on the Pressure-Temperature Profiles and Emission Spectra of Hot Jupiters
• Pseudo 2D chemical model of hot Jupiter atmospheres: application to HD 209458b and HD 189733b
• Eureka!: An End-to-End Pipeline for JWST Time-Series Observations
• The water abundance in Jupiter's equatorial zone
• A Comparative Study of Atmospheric Chemistry with VULCAN
• PICASO 3.0: A One-Dimensional Climate Model for Giant Planets and Brown Dwarfs
• Methane on Uranus: The case for a compact CH4 cloud layer at low latitudes and a severe CH4 depletion at high-latitudes based on re-analysis of Voyager occultation measurements and STIS spectroscopy
• A New Window into Planet Formation and Migration: Refractory-to-Volatile Elemental Ratios in Ultra-hot Jupiters
• JWST Noise Floor I: Random Error Sources in JWST NIRCam Time Series
• Connecting planet formation and astrochemistry: A main sequence for C/O in hot-exoplanetary atmospheres
• Detection of an Atmosphere on a Rocky Exoplanet
• A Library of Self-Consistent Simulated Exoplanet Atmospheres
• ARES V: No Evidence For Molecular Absorption in the HST WFC3 Spectrum of GJ 1132 b
• HyDRA-H: Simultaneous Hybrid Retrieval of Exoplanetary Emission Spectra
• 3D radiative-transfer for exoplanet atmospheres. gCMCRT: a GPU accelerated MCRT code
• Signs of strong Na and K absorption in the transmission spectrum of WASP-103b
• Simultaneous TESS and NGTS Transit Observations of WASP-166b
• Implementation of disequilibrium chemistry to spectral retrieval code ARCiS and application to sixteen exoplanet transmission spectra: Indication of disequilibrium chemistry for HD 209458b and WASP-39b
• A New Sedimentation Model for Greater Cloud Diversity in Giant Exoplanets and Brown Dwarfs
• Disentangling Hot Jupiters formation location from their chemical composition
• KELT-11 b: Abundances of water and constraints on carbon-bearing molecules from the Hubble transmission spectrum
• The role of clouds on the depletion of methane and water dominance in the transmission spectra of irradiated exoplanets
• The PHOENIX Exoplanet Retrieval Algorithm and Using H${}^{-}$ Opacity as a Probe in Ultra-hot Jupiters
• ExoTiC-ISM: A Python package for marginalised exoplanet transit parameters across a grid of systematic instrument models
• Scintillation-limited photometry with the 20-cm NGTS telescopes at Paranal Observatory
• The Origin and Evolution of Saturn: A Post-Cassini Perspective
• The Sonora Brown Dwarf Atmosphere and Evolution Models I. Model Description and Application to Cloudless Atmospheres in Rainout Chemical Equilibrium
• Photochemistry and Spectral Characterization of Temperate and Gas-Rich Exoplanets

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• The Hazy and Metal-Rich Atmosphere of GJ 1214 b Constrained by Near and Mid-Infrared Transmission Spectroscopy
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• A Mini-Chemical Scheme with Net Reactions for 3D GCMs II. 3D thermochemical modelling of WASP-39b and HD 189733b
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• A Population Analysis of 20 Exoplanets Observed from the Optical to the Near-infrared Wavelengths with HST: Evidence for Widespread Stellar Contamination
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• The GAPS programme at TNG LXIV: An inner eccentric sub-Neptune and an outer sub-Neptune-mass candidate around BD+00 444 (TOI-2443)
• ATMOSPHERIX: III- Estimating the C/O ratio and molecular dynamics at the limbs of WASP-76 b with SPIRou
• Strong NUV Refractory Absorption and Dissociated Water in the Hubble Transmission Spectrum of the Ultra Hot Jupiter KELT-20 b
• An extremely low-density exoplanet spins slow
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• Comparing transit spectroscopy pipelines at the catalogue level: evidence for systematic differences
• An Analytic Characterization of the Limb Asymmetry -- Transit Time Degeneracy
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• A Detailed Investigation of HD 209458 b HST & JWST Transmission Spectra with SANSAR
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• Using a neural network approach to accelerate disequilibrium chemistry calculations in exoplanet atmospheres
• Osiris revisited: Confirming a solar metallicity and low C/O in HD 209458b
• Lessons from Hubble and Spitzer: 1D Self-Consistent Model Grids for 19 Hot Jupiter Emission Spectra
• Experimental Investigation of the Photochemical Production of Hydrocarbons in Warm Gas Giant Exoplanet Atmospheres
• A re-analysis of equilibrium chemistry in five hot Jupiters
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• A Comprehensive Analysis of the Panchromatic Transmission Spectrum of the Hot-Saturn WASP-96 b: Nondetection of Haze, Possible Sodium Limb Asymmetry, Stellar Characterization, and Formation History
• Evidence for a Nonzero Eccentricity Superpuff Exoplanet WASP-107 b Using JWST Occultation Observation
• BD-14 3065b (TOI-4987b): from giant planet to brown dwarf: evidence for deuterium burning in old age?
• A joint effort to discover and characterize two resonant mini Neptunes around TOI-1803 with TESS, HARPS-N and CHEOPS
• Detection of CO${}_2$, CO, and H${}_2$O in the atmosphere of the warm sub-Saturn HAT-P-12b
• Measurements and predictions of H2 pressure-broadening coefficients of CO2 absorption lines for exoplanet atmosphere studies
• Open Source High-Resolution Exoplanet Atmosphere Retrievals with POSEIDON
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