Aurora: A Generalised Retrieval Framework for Exoplanetary Transmission Spectra
arXiv:2103.08600 · doi:10.3847/1538-4357/abee94
Abstract
Atmospheric retrievals of exoplanetary transmission spectra provide important constraints on various properties such as chemical abundances, cloud/haze properties, and characteristic temperatures, at the day-night atmospheric terminator. To date, most spectra have been observed for giant exoplanets due to which retrievals typically assume H-rich atmospheres. However, recent observations of mini-Neptunes/super-Earths, and the promise of upcoming facilities including JWST, call for a new generation of retrievals that can address a wide range of atmospheric compositions and related complexities. Here we report Aurora, a next-generation atmospheric retrieval framework that builds upon state-of-the-art architectures and incorporates the following key advancements: a) a generalised compositional retrieval allowing for H-rich and H-poor atmospheres, b) a generalised prescription for inhomogeneous clouds/hazes, c) multiple Bayesian inference algorithms for high-dimensional retrievals, d) modular considerations for refraction, forward scattering, and Mie-scattering, and e) noise modeling functionalities. We demonstrate Aurora on current and/or synthetic observations of hot Jupiter HD209458b, mini-Neptune K218b, and rocky exoplanet TRAPPIST1d. Using current HD209458b spectra, we demonstrate the robustness of our framework and cloud/haze prescription against assumptions of H-rich/H-poor atmospheres, improving on previous treatments. Using real and synthetic spectra of K218b, we demonstrate the agnostic approach to confidently constrain its bulk atmospheric composition and obtain precise abundance estimates. For TRAPPIST1d, 10 JWST NIRSpec transits can enable identification of the main atmospheric component for cloud-free CO-rich and N-rich atmospheres, and abundance constraints on trace gases including initial indications of O if present at enhanced levels (10-100x Earth levels).
arXiv commentAccepted for publication in ApJ
References in corpus (145)
- SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
- Array Programming with NumPy
- emcee: The MCMC Hammer
- The chemical composition of the Sun
- Cosmological parameters from SDSS and WMAP
- Binary companions of evolved stars in APOGEE DR14: Search method and catalog of ~5,000 companions
- MultiNest: an efficient and robust Bayesian inference tool for cosmology and particle physics
- dynesty: A Dynamic Nested Sampling Package for Estimating Bayesian Posteriors and Evidences
- A new extensive library of PHOENIX stellar atmospheres and synthetic spectra
- X-ray spectral modelling of the AGN obscuring region in the CDFS: Bayesian model selection and catalogue
- Seven temperate terrestrial planets around the nearby ultracool dwarf star TRAPPIST-1
- Detection of Planetary Transits Across a Sun-like Star
- Detection of an Extrasolar Planet Atmosphere
- Bayes in the sky: Bayesian inference and model selection in cosmology
- Fast and scalable Gaussian process modeling with applications to astronomical time series
- Importance Nested Sampling and the MultiNest Algorithm
- A continuum from clear to cloudy hot-Jupiter exoplanets without primordial water depletion
- Clouds in the atmosphere of the super-Earth exoplanet GJ 1214b
- Theoretical Transmission Spectra During Extrasolar Giant Planet Transits
- A Temperature and Abundance Retrieval Method for Exoplanet Atmospheres
- petitRADTRANS: a Python radiative transfer package for exoplanet characterization and retrieval
- Infrared Transmission Spectroscopy of the Exoplanets HD209458b and XO-1b Using the Wide Field Camera-3 on the Hubble Space Telescope
- PolyChord: nested sampling for cosmology
- Detection of atmospheric haze on an extrasolar planet: The 0.55 - 1.05 micron transmission spectrum of HD189733b with the Hubble Space Telescope
- PolyChord: next-generation nested sampling
- C/O ratio as a Dimension for Characterizing Exoplanetary Atmospheres
- Exoplanet Atmospheres
- Atmospheric Retrieval for Super-Earths: Uniquely Constraining the Atmospheric Composition with Transmission Spectroscopy
- ExoMol line lists IV: The rotation-vibration spectrum of methane up to 1500 K
- A Precise Water Abundance Measurement for the Hot Jupiter WASP-43b
- Rayleigh scattering in the transit spectrum of HD 189733b
- The Transit Light Source Effect: False Spectral Features and Incorrect Densities for M-dwarf Transiting Planets
- Characterizing transiting exoplanet atmospheres with JWST
- A Systematic Retrieval Analysis of Secondary Eclipse Spectra I: A Comparison of Atmospheric Retrieval Techniques
- A variationally computed line list for hot NH3
- Exoplanetary Atmospheres: Key Insights, Challenges and Prospects
- From thermal dissociation to condensation in the atmospheres of ultra hot Jupiters: WASP-121b in context
- PandExo: A Community Tool for Transiting Exoplanet Science with JWST & HST
- ExoMol line lists III: An improved hot rotation-vibration line list for HCN and HNC
- How to Distinguish between Cloudy Mini-Neptunes and Water/Volatile-Dominated Super-Earths
- Spectrally resolved detection of sodium in the atmosphere of HD189733b with the HARPS spectrograph
- Dynamic nested sampling: an improved algorithm for parameter estimation and evidence calculation
- H- Opacity and Water Dissociation in the Dayside Atmosphere of the Very Hot Gas Giant WASP-18 b
- Compositional diversity in the atmospheres of hot Neptunes, with application to GJ 436b
- Water Vapor and Clouds on the Habitable-Zone Sub-Neptune Exoplanet K2-18b
- HD 209458b in New Light: Evidence of Nitrogen Chemistry, Patchy Clouds and Sub-Solar Water
- Tau-REx I: A next generation retrieval code for exoplanetary atmospheres
- Water vapour in the atmosphere of the habitable-zone eight Earth-mass planet K2-18 b
- Retrieving Temperatures and Abundances of Exoplanet Atmospheres with High-Resolution Cross-Correlation Spectroscopy
- A revised estimate of the occurrence rate of terrestrial planets in the habitable zones around kepler m-dwarfs
- An ultrahot gas-giant exoplanet with a stratosphere
- Equilibrium chemistry down to 100 K - Impact of silicates and phyllosilicates on carbon/oxygen ratio
- Observing the Atmospheres of Known Temperate Earth-sized Planets with JWST
- A Sub-Neptune Exoplanet with a Low-Metallicity Methane-Depleted Atmosphere and Mie-Scattering Clouds
- Mass-Metallicity Trends in Transiting Exoplanets from Atmospheric Abundances of HO, Na, and K
- The Detectability and Characterization of the TRAPPIST-1 Exoplanet Atmospheres with JWST
- The Influence of Non-Uniform Cloud Cover on Transit Transmission Spectra
- A Systematic Retrieval Analysis of Secondary Eclipse Spectra II: A Uniform Analysis of Eight Planets and Their C to O Ratios
- HO abundances and cloud properties in ten hot giant exoplanets
- 197 Candidates and 104 Validated Planets in K2's First Five Fields
- HAT-P-26b: A Neptune-Mass Exoplanet with a Well Constrained Heavy Element Abundance
- A consistent retrieval analysis of 10 Hot Jupiters observed in transmission
- Detection of titanium oxide in the atmosphere of a hot Jupiter
- TauREx III: A fast, dynamic and extendable framework for retrievals
- Optimal Estimation Retrievals of the Atmospheric Structure and Composition of HD 189733b from Secondary Eclipse Spectroscopy
- The Complete transmission spectrum of WASP-39b with a precise water constraint
- Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs I: Characterizing Benchmarks, Gl570D and HD3651B
- Tau-REx II: Retrieval of emission spectra
- Habitable worlds with JWST: transit spectroscopy of the TRAPPIST-1 system?
- ACCESS I: An Optical Transmission Spectrum of GJ 1214b Reveals a Heterogeneous Stellar Photosphere
- An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet
- Evolved Climates and Observational Discriminants for the TRAPPIST-1 Planetary System
- H2O abundances in the atmospheres of three hot Jupiters
- HELIOS-Retrieval: An Open-source, Nested Sampling Atmospheric Retrieval Code, Application to the HR 8799 Exoplanets and Inferred Constraints for Planet Formation
- Retrieval analysis of 38 WFC3 transmission spectra and resolution of the normalisation degeneracy
- Retrieval of planetary and stellar properties in transmission spectroscopy with Aura
- Constraining Exoplanet Mass from Transmission Spectroscopy
- Retrieval of atmospheric properties of cloudy L dwarfs
- New study of the line profiles of sodium perturbed by H2
- Detectability of biosignatures in anoxic atmospheres with the James Webb Space Telescope: A TRAPPIST-1e case study
- High Metallicity and Non-equilibrium Chemistry in the Dayside Atmosphere of hot-Neptune GJ 436b
- TRAPPIST: a robotic telescope dedicated to the study of planetary systems
- GENESIS: New Self-Consistent Models of Exoplanetary Spectra
- The interior and atmosphere of the habitable-zone exoplanet K2-18b
- Detectability of atmospheric features of Earth-like planets in the habitable zone around M dwarfs
- Forward modelling and retrievals with PLATON, a fast open source tool
- Effects of a fully 3D atmospheric structure on exoplanet transmission spectra: retrieval biases due to day-night temperature gradients
- Spitzer Observations Confirm and Rescue the Habitable-Zone Super-Earth K2-18b for Future Characterization
- The Precision of Mass Measurements Required for Robust Atmospheric Characterization of Transiting Exoplanets
- Why is it so Cold in Here?: Explaining the Cold Temperatures Retrieved from Transmission Spectra of Exoplanet Atmospheres
- Retrieval of Exoplanet Emission Spectra with HyDRA
- Atmospheric Retrieval Analysis of the Directly Imaged Exoplanet HR 8799b
- PLATON II: New Capabilities And A Comprehensive Retrieval on HD 189733b Transit and Eclipse Data
- The GTC exoplanet transit spectroscopy survey IX. Detection of Haze, Na, K, and Li in the super-Neptune WASP-127b
- Atmospheric Regimes and Trends on Exoplanets and Brown Dwarfs
- On degeneracies in retrievals of exoplanetary transmission spectra
- On Signatures of Clouds in Exoplanetary Transit Spectra
- Strategies for Constraining the Atmospheres of Temperate Terrestrial Planets with JWST
- The ARCiS framework for Exoplanet Atmospheres: Modelling Philosophy and Retrieval
- Helios-r2 -- A new Bayesian, open-source retrieval model for brown dwarfs and exoplanet atmospheres
- The CARMENES search for exoplanets around M dwarfs: A low-mass planet in the temperate zone of the nearby K2-18
- Strong biases in retrieved atmospheric composition caused by strong day-night chemical heterogeneities
- Clouds on the hot Jupiter HD189733b: constraints from the reflection spectrum
- 2.5-D retrieval of atmospheric properties from exoplanet phase curves: Application to WASP-43b observations
- Towards a more complex description of chemical profiles in exoplanets retrievals: A 2-layer parameterisation
- ExoGAN: Retrieving Exoplanetary Atmospheres Using Deep Convolutional Generative Adversarial Networks
- Wind of Change: retrieving exoplanet atmospheric winds from high-resolution spectroscopy
- Molecular Cross Sections for High Resolution Spectroscopy of Super Earths, Warm Neptunes and Hot Jupiters
- A Uniform Retrieval Analysis of Ultracool Dwarfs. III. Properties of Y-Dwarfs
- Unveiling cloudy exoplanets: the influence of cloud model choices on retrieval solutions
- Super-Rayleigh Slopes in Transmission Spectra of Exoplanets Generated by Photochemical Haze
- An Ensemble of Bayesian Neural Networks for Exoplanetary Atmospheric Retrieval
- Information Content Analysis for Selection of Optimal JWST Observing Modes for Transiting Exoplanet Atmospheres
- Developing Atmospheric Retrieval Methods for Direct Imaging Spectroscopy of Gas Giants in Reflected Light I: Methane Abundances and Basic Cloud Properties
- Aggregate Hazes in Exoplanet Atmospheres
- Exploring Exoplanet Cloud Assumptions in \textit{JWST} Transmission Spectra
- Clouds will likely prevent the detection of water vapor in JWST transmission spectra of terrestrial exoplanets
- The Implications of 3D Thermal Structure on 1D Atmospheric Retrieval
- HyDRA-H: Simultaneous Hybrid Retrieval of Exoplanetary Emission Spectra
- An optical transmission spectrum of the ultra-hot Jupiter WASP-33b. First indication of AlO in an exoplanet
- Telling twins apart: Exo-Earths and Venuses with transit spectroscopy
- Photochemical hazes in sub-Neptunian atmospheres with focus on GJ 1214 b
- Dreaming of atmospheres
- Interpreting High-Resolution Spectroscopy of Exoplanets Using Cross-Correlations and Supervised Machine Learning
- The Influence of Stellar Contamination on the Interpretation of Near Infrared Transmission Spectra of Sub-Neptune Worlds around M-Dwarfs
- WASP-52b. The effect of starspot correction on atmospheric retrievals
- 2D Retrieval Frameworks for Hot Jupiter Phase Curves
- Atmospheric Retrieval for Direct Imaging Spectroscopy of Gas Giants In Reflected Light II: Orbital Phase and Planetary Radius
- An Approach for Retrieving Temperatures and Abundances in Brown Dwarf Atmospheres
- Assessment of Supervised Machine Learning for Atmospheric Retrieval of Exoplanets
- Optimizing exoplanet atmosphere retrieval using unsupervised machine-learning classification
- Considerations for Atmospheric Retrieval of High-Precision Brown Dwarf Spectra
- JWST Transit Spectra I: Exploring Potential Biases and Opportunities in Retrievals of Tidally-locked Hot Jupiters with Clouds and Hazes
- The Dynamics-Based Approach to Studying Terrestrial Exoplanets
- An Unusual Transmission Spectrum for the Sub-Saturn KELT-11b Suggestive of a Sub-Solar Water Abundance
- Bayesian Methods in Cosmology
- ExoReL: A Bayesian Inverse Retrieval Framework For Exoplanetary Reflected Light Spectra
- How Much Information Does the Sodium Doublet Encode? Retrieval Analysis of Non-LTE Sodium Lines at Low and High Spectral Resolutions
- Analytic Scattering and Refraction Models for Exoplanet Transit Spectra
- Information content of JWST-NIRSPEC transmission spectra of warm Neptunes
- Impact of planetary mass uncertainties on exoplanet atmospheric retrievals
- TauREx3 PhaseCurve: A 1.5D model for phase curve description
- The Transit Spectra of Earth and Jupiter
- Bayesian Deep Learning for Exoplanet Atmospheric Retrieval
- Characterizing Exoplanet Atmospheres: From Light-curve Observations to Radiative-transfer Modeling
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- Early Release Science of the exoplanet WASP-39b with JWST NIRISS
- A High Internal Heat Flux and Large Core in a Warm Neptune Exoplanet
- Sulphur dioxide in the mid-infrared transmission spectrum of WASP-39b
- Awesome SOSS: Transmission Spectroscopy of WASP-96b with NIRISS/SOSS
- TRIDENT: A Rapid 3D Radiative Transfer Model for Exoplanet Transmission Spectra
- Near-Infrared Transmission Spectroscopy of HAT-P-18b with NIRISS: Disentangling Planetary and Stellar Features in the Era of JWST
- How Deep Is the Ocean? Exploring the phase structure of water-rich sub-Neptunes
- Spatially-resolving the terminator: Variation of Fe, temperature and winds in WASP-76 b across planetary limbs and orbital phase
- JWST transmission spectroscopy of HD 209458b: a super-solar metallicity, a very low C/O, and no evidence of CH4, HCN, or C2H2
- Awesome SOSS: Atmospheric Characterisation of WASP-96 b using the JWST Early Release Observations
- On Atmospheric Retrievals of Exoplanets with Inhomogeneous Terminators
- Hubble Space Telescope transmission spectroscopy for the temperate sub-Neptune TOI-270d: a possible hydrogen-rich atmosphere containing water vapour
- On the Application of Bayesian Leave-One-Out Cross-Validation to Exoplanet Atmospheric Analysis
- Escaping Helium and a Highly Muted Spectrum Suggest a Metal-Enriched Atmosphere on Sub-Neptune GJ3090b from JWST Transit Spectroscopy
- Aura-3D: A Three-dimensional Atmospheric Retrieval Framework for Exoplanet Transmission Spectra
- A Catalogue of Exoplanet Atmospheric Retrieval Codes
- Evidence for Morning-to-Evening Limb Asymmetry on the Cool Low-Density Exoplanet WASP-107b
- Challenges in the detection of gases in exoplanet atmospheres
- Mineral Snowflakes on Exoplanets and Brown Dwarfs: Coagulation and Fragmentation of Cloud Particles with {\sc HyLandS}
- YunMa: Enabling Spectral Retrievals of Exoplanetary Clouds
- Magma ocean interactions can explain JWST observations of the sub-Neptune TOI-270 d
- Tracing the formation and migration history: molecular signatures in the atmosphere of misaligned hot Jupiter WASP-94Ab using JWST NIRSpec/G395H
- Enabling Robust Exoplanet Atmospheric Retrievals with Gaussian Processes
- LRG-BEASTS: Evidence for clouds in the transmission spectrum of HATS-46 b
- HST Transmission Spectra of the Hot-Neptune HD 219666 b: Detection of Water and the Challenge of Constraining Both Water and Methane
- Radiative Transfer and Inversion codes for characterizing planetary atmospheres: an overview
- A Detailed Investigation of HD 209458 b HST & JWST Transmission Spectra with SANSAR
- Osiris revisited: Confirming a solar metallicity and low C/O in HD 209458b
- Transverse Vector Decomposition Method for Analytical Inversion of Exoplanet Transit Spectra
- Ground-based Atmospheric Characterization of Super-Earth L 98-59 d at High Spectral Resolution
- A Two-limb Explanation for the Optical-to-infrared Transmission Spectrum of the Hot Jupiter HAT-P-32Ab
- Methane on the temperate exo-Saturn TOI-199b
- Horizontal transport as a source of disequilibrium chemistry on the nightside of a hot exoplanet
- KRONOS I: The m JWST Transmission Spectrum of the 23 Myr V1298 Tau c
- HyDRo: Atmospheric Retrieval of Rocky Exoplanets in Thermal Emission
- Impact of Clouds on the Atmosphere-Mantle Interface of Sub-Neptunes