Open science archive // Stellar spectroscopy // Exoplanetary chemistry
A systematic archive documenting the elemental chemistry of exoplanetary systems — measuring what stars are made of, and using that chemistry to understand what their planets are made of too.
A Sun-centered view in parsecs. Positions are projected onto the Galactic plane: toward the Galactic center is right; Galactic rotation is up. Coordinates are never moved for appearance.
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Currently indexed: 12 systems · More added as analysis completes
The calibration anchor for all Codex measurements. Every [X/H] abundance is measured relative to the Sun. Solar EW results published. Abundance charts live.
A metal-rich K dwarf hosting five planets including Janssen — a lava super-Earth with a possible CO₂ atmosphere (JWST 2024). The C/O ratio of this star remains contested. We are measuring it.
Our nearest stellar neighbor. Candidate Saturn-mass planet detected by JWST MIRI; re-observation August 2026. Abundances in progress — HARPS 75 files complete, HST/MAST downloading.
We combine high-resolution UV, visible, and infrared spectra from HST/STIS and COS, HARPS and HARPS-N, ESPRESSO, UVES, CRIRES+, NIRPS, and other validated archives as appropriate. Reproducible line selection and laboratory-graded atomic data feed multiple abundance engines, comparing 1D/3D and LTE/NLTE treatments where scientifically valid. Measurement, atomic-data, stellar-parameter, and model uncertainties remain traceable to the spectra, line data, models, and methods; results are validated on the Sun and benchmark stars before extension to exoplanet hosts.
“This started as a senior astrophysics thesis in 2010 — three star systems, hand-fitted Gaussians, and a question: can you read the chemistry of a star and know what its planets are made of? I spent fifteen years building lasers and consulting on AI. The question never went away.”
We’re measuring 55 Cancri A now. Get notified when the first Codex entry publishes.