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Astronomers have identified 27 potential planets orbiting two suns, a discovery that could dramatically expand our understanding of how worlds form in complex stellar systems.
An international team of astronomers has uncovered 27 candidate circumbinary planets—worlds that orbit not one, but two stars—using data from NASA’s Transiting Exoplanet Survey Satellite (TESS). The findings, published in the Monthly Notices of the Royal Astronomical Society, mark one of the largest single leaps in the search for planets in binary star systems.
Until now, only 18 such planets had been confirmed, making these new candidates a significant expansion of a rare and intriguing category of exoplanets. These potential worlds lie between 650 and 18,000 light-years from Earth and range in size from Neptune-like bodies to giants ten times the mass of Jupiter.
A Breakthrough in Detection
Traditional planet-hunting methods rely on watching for a planet to pass in front of its star, dimming its light. But this technique often fails in binary systems, where the geometry must align perfectly with Earth’s line of sight.
The research team instead used a more subtle approach:
eclipse timing variations—tiny shifts in the moments when two stars eclipse each other. These shifts can reveal the gravitational tug of an unseen third body, such as a planet. This method, known as apsidal precession, allowed scientists to detect planets even when they never transit their stars.
By analyzing 1,590 eclipsing binary systems, the team identified 36 systems with unexplained orbital behavior. In 27 of these, the most likely explanation is a planet.
Why This Discovery Matters
More than half of all stars in the universe exist in binary systems, yet circumbinary planets have remained elusive. This discovery suggests that such planets may be far more common than previously thought.
The findings also challenge long-standing assumptions about planet formation. Binary stars create turbulent gravitational environments, once thought too unstable for planets to form. Yet these new candidates show that planetary systems can thrive even under extreme conditions.
Astrophysicist Sara Webb notes that while environments on these planets would be unusual, some could still lie in habitable zones, where liquid water might exist.
From Science Fiction to Reality
The discovery resonates strongly with fans of Star Wars, where Luke Skywalker gazes at a double sunset on the fictional planet Tatooine. Once purely imaginative, such twin-sun worlds are now scientifically plausible—and increasingly observable.
What Comes Next
These 27 candidates are not yet confirmed planets. Astronomers will now conduct follow-up observations, including measuring stellar velocities, to determine whether these bodies are planets, brown dwarfs, or small stars.
If confirmed, they could more than double the known population of circumbinary planets—and open a new chapter in the search for life beyond Earth.
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