Catalog
Filter wide binaries by co-natal status, planet ingestion candidates, separation, Δ[Fe/H], and available spectra.
Research Database
Complete Census of Co-moving Pairs Of Stars
C3PO is a high-resolution spectroscopic survey of 125 bright co-moving stellar pairs. The database brings together precise stellar parameters, chemistry differences, astrometry, measured velocities, equivalent widths, and interactive spectra for wide-binary science.
125
co-moving stellar pairs in the curated C3PO catalog
250
bright F/G/K stars with high-SNR spectroscopic analysis
6
papers in the C3PO series, linked to public arXiv and media artifacts
23
chemical elements compared star-by-star
Data Products
A database built for pair-by-pair comparison
The public site stays browser-ready, while the full database remains self-contained in the separate C3PO_Database directory with source tables, analysis-ready pickle files, notebooks, scripts, and full CSV spectra.
Spectra
Inspect high-point browser previews for available C3PO stars, with links back to the source CSV filenames in the database package.
Flight
Fly through a self-contained C3PO binary scene using Gaia sky directions, measured stellar colors, catalog pair spacing, and survey flags.
Live Workbench
Work with the C3PO data directly
Each embedded panel is the same self-contained tool as its full page. On narrow mobile screens, the heavier flight and spectra panels become lightweight launch cards so the landing page stays fast.
C3PO pair flight
Navigate the Gaia star field with Space and arrow-key controls, then jump to curated C3PO wide binaries rendered as two measured stars inside one pair-level ring.
Open the full flight applet
The landing page skips the embedded 3D Gaia field on phones to keep the first load light. The full flight page is still available when you want the interactive view.
Pair catalog
Search, filter, sort, and page through the curated 125-pair browser catalog while preserving links into the spectra viewer for stars with available observations.
Spectra viewer
Inspect high-point spectra previews linked back to the full-resolution C3PO database files, with instrument filtering, interactive selection, zooming, and panning.
Open the full spectra viewer
The landing page skips the embedded spectra tool on phones to save data. The full viewer remains one tap away for detailed line inspection.
Publications
The C3PO series
Six C3PO papers use co-moving pairs as controlled laboratories for chemistry, planet signatures, stellar evolution, magnetic activity, rotation, and wide-binary gravity.
C3PO I
Stellar twins stay chemically alike across enormous separations
C3PO I shows that many co-moving pairs remain chemically twin-like out to roughly a million Earth-Sun distances, defining the survey's cleanest birth-signature regime.
C3PO II
At least one in a dozen Sun-like stars may have swallowed planets
Using co-natal pairs as controlled experiments, C3PO II identifies seven new planet-ingestion candidates, an occurrence rate of about eight percent.
C3PO III
Lithium only speaks clearly among true stellar twins
C3PO III shows that planet-engulfment lithium signatures are discernible only for highly similar stars; ordinary stellar evolution can otherwise mask the signal.
C3PO IV
Planet-building chemistry tracks stellar magnetic activity
C3PO IV finds that co-natal stars depleted in refractory elements are more magnetically active, connecting planet-formation chemistry to stellar behavior.
C3PO V
Stellar spin-down explains the lithium dip
C3PO V uses co-moving pairs around the hot side of the Li dip to isolate rotation-driven mixing as the dominant lithium-depletion process.
C3PO VI
Meter-per-second line-of-sight speeds turn wide binaries into gravity tests
C3PO VI measures meter-per-second line-of-sight speed differences for 100 wide binaries, improving on Gaia radial velocities and testing MOND-scale dynamics.
