Researchers from the University of Lancashire and a new satellite survey suggest that planets orbiting two stars are far more common than previously believed.
This discovery challenges existing models of planetary formation and suggests that the conditions required to sustain a planet in a binary star system are more flexible than once assumed.
These "Tatooine-like" planets, known scientifically as circumbinary planets, orbit a pair of stars rather than a single sun. For years, astronomers identified only a small number of these worlds. Some records indicated as few as 18 examples [4], while other reports listed approximately 50 confirmed circumbinary planets [1].
A recent survey has expanded this tally by identifying 27 potential circumbinary planets [2]. Other reports describe this new finding as nearly 30 unusual planets orbiting two stars [3]. These candidates were uncovered using a new satellite survey of the sky, which helped mitigate previous observational biases.
Scientists said that the scarcity of these planets in earlier data was largely due to the effects of Einstein’s general relativity on planet detection [6]. These relativistic effects can complicate the process of identifying a planet's orbit when two massive stars are involved, making them harder to spot with older technology.
Despite the recent increase in candidates, these worlds remain a minority of the total exoplanet population. Some data suggests that the known circumbinary planets represent a fraction of the over six percent of all exoplanets surveyed [5].
The University of Lancashire study and the accompanying satellite data indicate that the universe may be populated with many more of these complex systems than the scientific community had estimated in previous decades.
“Planets orbiting two stars are far more common than previously believed.”
The increase in detected circumbinary planets indicates that planetary systems are more resilient and diverse than previously modeled. By overcoming the observational hurdles caused by general relativity and detection bias, astronomers are finding that the 'rare' occurrence of planets in binary systems may actually be a common cosmic phenomenon, potentially expanding the number of locations where astronomers can search for habitable environments.
