Worth Revisiting · Exoplanet Search
70 Ophiuchi leaves room for small habitable-zone planets
Worth Revisiting: A century of data finds no coherent planet signal but rules out giant companions across much of the nearby binary system.
Briefed September 30, 2026 · Aliens in the Clouds
Peer-Reviewed Null Result · Smaller Worlds Still Allowed
A peer-reviewed radial-velocity search assembled 499 measurements of 70 Ophiuchi A and 334 of its binary companion from 2023 through 2025, then joined them to archival observations spanning more than a century. After modeling the binary orbit, stellar activity, and instrumental offsets, the team found no coherent periodic signal attributable to a planet around either star.
The null result is still informative. Around the primary, the data exclude roughly Jupiter-mass planets inside five astronomical units and reach about 0.3 Jupiter masses at one astronomical unit and 0.5 at two. Around the secondary, planets above approximately 0.25 to 0.3 Jupiter masses are excluded inside half an astronomical unit. Stable orbits around 70 Ophiuchi A extend to about 2.5 astronomical units and include its habitable zone, so Saturn-mass and smaller worlds can still hide there; none has been detected.
Why it matters
A nearby binary is a demanding test of planet formation and detection. Publishing what is absent prevents repeated false starts while defining the sensitivity the next instrument must beat.
What the source establishes
Worth Revisiting · Peer-reviewed null result with a current institutional update. The survey constrains giant planets over stated orbital ranges; it does not prove that smaller planets exist.
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