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Millions of Atmospheres Move Through the GPU
BeAR joins high- and low-resolution exoplanet spectra in one retrieval while exposing uncertainty that injection tests say is too narrow.
Summary
BeAR joins high- and low-resolution exoplanet spectra in one retrieval while exposing uncertainty that injection tests say is too narrow.
The Bern Atmospheric Retrieval code runs its forward model and likelihood entirely on GPUs and combines high- and low-resolution spectra from the same atmospheric model. On a GH200, the authors report about one millisecond per forward model; an IGRINS retrieval with 17 free parameters took 27 to 42 minutes on one RTX 5080 or about 14 minutes on eight RTX 4090s. Separate and joint retrievals of WASP-77Ab reproduced published abundance and thermal results within the stated comparisons. Injection-recovery tests also found abundance-ratio posteriors underestimated uncertainty by about a factor of two, an important limitation alongside the speed.
Why it matters
BeAR joins high- and low-resolution exoplanet spectra in one retrieval while exposing uncertainty that injection tests say is too narrow.
Limits and context
No additional limitation was separately recorded.
Key claims
BeAR joins high- and low-resolution exoplanet spectra in one retrieval while exposing uncertainty that injection tests say is too narrow.
Evidence: source-2026-11-08-003
Sources
- arXiv preprint 2611.08489, original v1arXiv · primary research
Corrections
No corrections have been recorded for this story.