Amortized Opacity Marginalization Improves C/O Interval Calibration for Brown-Dwarf Retrievals

arXiv:2609.01665 · astro-ph.IM, astro-ph.EP, astro-ph.SR · Submitted 2026-09-01 · Read on arXiv

astro-ph.IM, astro-ph.EP, astro-ph.SR

Submitted: 2026-09-01

Updated: 2026-10-05

Code: https://github.com/kaileh57/opacity-marginalization

Terminology

• Calibration — 21× in this paper · explained in 7 episodes
• Simulation-based Inference — 5× in this paper · explained in 2 episodes
• Ablation — 4× in this paper · explained in 1 episode
• Abundance — 4× in this paper · explained in 1 episode
• Benchmark — 4× in this paper · explained in 2 episodes
• Core — 4× in this paper · explained in 2 episodes
• Accuracy — 3× in this paper · explained in 1 episode
• Consistency — 2× in this paper · explained in 3 episodes
• In International Conference on Machine Learning — 2× in this paper
• Metallicity — 2× in this paper · explained in 3 episodes
• Normalizing Flow — 2× in this paper · explained in 3 episodes
• Normalizing Flows — 2× in this paper · explained in 4 episodes
• 1D CNN — 1× in this paper · explained in 2 episodes
• Adam — 1× in this paper · explained in 2 episodes
• Bayesian Inference — 1× in this paper · explained in 5 episodes
• Fidelity — 1× in this paper · explained in 2 episodes
• Generalization — 1× in this paper · explained in 13 episodes
• Information Gain — 1× in this paper · explained in 2 episodes
• Quantization — 1× in this paper · explained in 12 episodes
• Trace — 1× in this paper · explained in 2 episodes

Sources

• Nuisance hardened data compression for fast likelihood-free inference
• A comparison of exoplanet spectroscopic retrieval tools
• Investigating the Impact of Model Misspecification in Neural Simulation-based Inference
• The frontier of simulation-based inference
• Towards Reliable Simulation-Based Inference with Balanced Neural Ratio Estimation
• The Influence of H2O Pressure Broadening in High Metallicity Exoplanet Atmospheres
• Automatic Posterior Transformation for Likelihood-Free Inference
• A Trust Crisis In Simulation-Based Inference? Your Posterior Approximations Can Be Unfaithful
• High-Precision Atmospheric Constraints for a Cool T Dwarf from JWST Spectroscopy
• Measurement of Methane Line Broadening in Hot Hydrogen/Helium Atmospheres at $\lambda$ = 1.60-1.63 \mu m for Substellar Object Spectroscopy
• Auto-Differentiable Spectrum Model for High-Dispersion Characterization of Exoplanets and Brown Dwarfs
• Differentiable Modeling of Planet and Substellar Atmosphere: High-Resolution Emission, Transmission, and Reflection Spectroscopy with ExoJAX2
• Accurate Uncertainties for Deep Learning Using Calibrated Regression
• Simple and Scalable Predictive Uncertainty Estimation using Deep Ensembles
• Sampling-Based Accuracy Testing of Posterior Estimators for General Inference
• Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs I: Characterizing Benchmarks, Gl570D and HD3651B
• Supervised Machine Learning for Analysing Spectra of Exoplanetary Atmospheres
• The Impending Opacity Challenge in Exoplanet Atmospheric Characterization
• Origin and extent of the opacity challenge for atmospheric retrievals of WASP-39 b
• Fast $\epsilon$-free Inference of Simulation Models with Bayesian Conditional Density Estimation

Related papers

• A signal dedispersion algorithm for imaging-based transient searches
• AVICA: A fully automated CASA pipeline for large volume VLBI data calibration
• Spectral Map Making with SPHEREx
• Long-Integration Magnetar Burst Observatory (LIMBO): Instrument Summary and Early FRB Rate Constraints
• Towards independent event horizon imaging of the supermassive black holes in M87 and the Milky Way
• A PINK update: Improvements to the CELEBI fast radio burst data reduction and analysis pipeline