Vertical structure of an exoplanet's atmospheric jet stream
arXiv:2502.12261 · doi:10.1038/s41586-025-08664-1
Abstract
Ultra-hot Jupiters, an extreme class of planets not found in our solar system, provide a unique window into atmospheric processes. The extreme temperature contrasts between their day- and night-sides pose a fundamental climate puzzle: how is energy distributed? To address this, we must observe the 3D structure of these atmospheres, particularly their vertical circulation patterns, which can serve as a testbed for advanced Global Circulation Models (GCM) [e.g. 1]. Here, we show a dramatic shift in atmospheric circulation in an ultra-hot Jupiter: a unilateral flow from the hot star-facing side to the cooler space-facing side of the planet sits below an equatorial super-rotational jet stream. By resolving the vertical structure of atmospheric dynamics, we move beyond integrated global snapshots of the atmosphere, enabling more accurate identification of flow patterns and allowing for a more nuanced comparison to models. Global circulation models based on first principles struggle to replicate the observed circulation pattern [3], underscoring a critical gap between theoretical understanding of atmospheric flows and observational evidence. This work serves as a testbed to develop more comprehensive models applicable beyond our Solar System as we prepare for the next generation of giant telescopes.
Accepted for publication in Nature on 16th January 2025, published with DOI 10.1038/s41586-025-08664-1, 5 main figures, 12 main pages plus methods. This work has a companion paper on the same dataset: Prinoth et al. 2025, A&A, DOI: 10.1051/0004-6361/202452405
References in corpus (46)
- Gaia Data Release 2. Summary of the contents and survey properties
- A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
- Multimodal nested sampling: an efficient and robust alternative to MCMC methods for astronomical data analysis
- Bayes in the sky: Bayesian inference and model selection in cosmology
- Molecfit: A general tool for telluric absorption correction. I. Method and application to ESO instruments
- petitRADTRANS: a Python radiative transfer package for exoplanet characterization and retrieval
- ESPRESSO@VLT -- On-sky performance and first results
- Molecfit: A general tool for telluric absorption correction II. Quantitative evaluation on ESO-VLT X-Shooter spectra
- Equatorial superrotation on tidally locked exoplanets
- Spectrally resolved detection of sodium in the atmosphere of HD189733b with the HARPS spectrograph
- Nightside condensation of iron in an ultra-hot giant exoplanet
- WASP-121 b: a hot Jupiter in a polar orbit and close to tidal disruption
- The Rossiter-McLaughlin effect reloaded: Probing the 3D spin-orbit geometry, differential stellar rotation, and the spatially-resolved stellar spectrum of star-planet systems
- Increased Heat Transport in Ultra-Hot Jupiter Atmospheres Through H Dissociation/Recombination
- Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) IV. A spectral inventory of atoms and molecules in the high-resolution transmission spectrum of WASP-121 b
- Atmospheric Rossiter-McLaughlin effect and transmission spectroscopy of WASP-121b with ESPRESSO
- Neutral Iron Emission Lines From The Day-side Of KELT-9b -- The GAPS Programme With HARPS-N At TNG XX
- WASP-42 b and WASP-49 b: two new transiting sub-Jupiters
- Hot Exoplanet Atmospheres Resolved with Transit Spectroscopy (HEARTS) III. Atmospheric structure of the misaligned ultra-hot Jupiter WASP-121b
- On degeneracies in retrievals of exoplanetary transmission spectra
- Search for water vapor in the high-resolution transmission spectrum of HD189733b in the visible
- Search for an exosphere in sodium and calcium in the transmission spectrum of exoplanet 55 Cancri e
- Wind of Change: retrieving exoplanet atmospheric winds from high-resolution spectroscopy
- Confirmation of Asymmetric Iron Absorption in WASP-76b with HARPS
- p-winds: an open-source Python code to model planetary outflows and upper atmospheres
- Into the Storm: Diving into the winds of the ultra hot Jupiter WASP-76 b with HARPS and ESPRESSO
- Cloud property trends in hot and ultra-hot giant gas planets (WASP-43b, WASP-103b, WASP-121b, HAT-P-7b, and WASP-18b)
- A Model of the H and Na Transmission Spectrum of HD 189733b
- Signs of strong Na and K absorption in the transmission spectrum of WASP-103b
- PySME -- Spectroscopy Made Easier
- Time-resolved rotational velocities in the upper atmosphere of WASP-33 b
- Detection of a high-velocity sodium feature on the ultra-hot Jupiter WASP-121 b
- Is the atmosphere of the ultra-hot Jupiter WASP-121b variable?
- - A tool for multiband light curve modeling of planetary transits and stellar spots
- Search for helium in the upper atmosphere of the hot Jupiter WASP-127 b using Gemini/Phoenix
- A hydrodynamic study of the escape of metal species and excited hydrogen from the atmosphere of the hot Jupiter WASP-121b
- The Mantis Network II: Examining the 3D high-resolution observable properties of the UHJs WASP-121b and WASP-189b through GCM modelling
- An atlas of resolved spectral features in the transmission spectrum of WASP-189 b with MAROON-X
- Magnetic Effects and 3D Structure in Theoretical High-Resolution Transmission Spectra of Ultrahot Jupiters: the Case of WASP-76b
- The Mantis Network I: A standard grid of templates and masks for cross-correlation analyses of ultra-hot Jupiter transmission spectra
- SAGE: A tool to constrain impacts of stellar activity on transmission spectroscopy
- Detecting Biosignatures in Nearby Rocky Exoplanets using High-Contrast Imaging and Medium-Resolution Spectroscopy with Extremely Large Telescope
- Mass loss by atmospheric escape from extremely close-in planets
- Optimising spectroscopic observations of transiting exoplanets
- Phase-resolving the absorption signatures of water and carbon monoxide in the atmosphere of the ultra-hot Jupiter WASP-121b with GEMINI-S/IGRINS
- Up, Up, and Away: Winds and Dynamical Structure as a Function of Altitude in the Ultra-Hot Jupiter WASP-76b
Cited by in corpus (14)
- Time Resolved Absorption of Six Chemical Species With MAROON-X Points to Strong Drag in the Ultra Hot Jupiter TOI-1518 b
- Extreme winds on the emerging dayside of an ultrahot Jupiter
- Retrieving day- and nightside atmospheric properties of the ultra-hot Jupiter TOI-2109b. Detection of Fe and CO emission lines and evidence for inefficient heat transport
- Planet Earth in reflected and polarized light: II. Refining contrast estimates for rocky exoplanets with ELT and HWO
- The ESPRESSO transmission spectrum of HD189733b : Extracting the planetary sodium and lithium signatures amid stellar contamination
- No TiO detected in the hot Neptune-desert planet LTT-9779 b in reflected light at high spectral resolution
- The GAPS Programme at TNG. LXIX.The Dayside of WASP-76b revealed by GIANO-B, HARPS-N and ESPRESSO: Evidence for Three-Dimensional Atmospheric Effects
- Influence of Planetary Rotation on Supersonic Flow of Lava Planets: A Two-Dimensional Horizontal Model Analysis
- Magnetic field strengths of hot giant exoplanets consistent with Solar System values
- Assessing robustness and bias in 1D retrievals of 3D Global Circulation Models at high spectral resolution: a WASP-76 b simulation case study in emission
- Atmospheric asymmetries in WASP-121 b revealed by rotational transits detected with JWST
- First Results from WINERED: Detection of Emission Lines from Neutral Iron and a Combined Set of Trace Species on the Dayside of WASP-189 b
- Precise Constraints on the Energy Budget of WASP-121 b from its JWST NIRISS/SOSS Phase Curve
- Exploring the surface of HD 189733 via Doppler shadow analysis of planetary transits