zyntrax

Kepler watched one patch of sky for four years, catching planets cross their stars. Some blinked once; others several times. The one-blink stars turned up more often than expected, so astronomers proposed a “Kepler dichotomy”: a second family of single or steeply tilted systems.

A new paper says the dichotomy is an illusion of detection. Daniel Yahalomi (MIT) and coauthors ran a planet-population model (ExoMOD) against Kepler's DR25 catalog of 2,557 candidate planets around Sun-like stars. Their model has no false positives, yet it still reproduces the faint one-blink excess.

In it, 85% of detected single-transit planets sit in systems holding more than one planet; Kepler missed the siblings. Past 100-day orbits, still 73%.

Why: spotting several planets around one star favors compact, short-period systems, which transit more often and dip deeper. Long-period planets give fainter signals, and their unseen companions land in the “single” pile.

Caveats: not peer reviewed (submitted to AAS journals, Oct 15 2026). The 85% is model output, not a detection; it assumes one shared parent population. The data settle the pattern; how many hidden planets exist is inference.

Source: arXiv 2610.22349v1, Yahalomi et al. (section VII).