Analysis of 61 Cygni binary system reveals candidate super-Jupiter planet

The 61 Cygni binary system, located approximately 11.4 light-years from Earth, is one of our closest neighbors and a primary target for searching for Earth-like planets. New analysis of this system provides evidence for a candidate giant planet orbiting the stars. The object, categorized as a super-Jupiter—a planet significantly more massive than Jupiter—is estimated to orbit at a distance similar to that of the outer planets in our own solar system.

The findings combine nearly 40 years of radial velocity measurements, which track the subtle wobbling of stars caused by the gravitational pull of orbiting planets, with precise astrometric data from the Gaia mission. By running complex dynamical simulations, researchers determined the companion is likely a planet with about eight times the mass of Jupiter, situated in an orbit approximately eight astronomical units from the binary stars.

Calculations based on the system's mature age of roughly 6 billion years suggest the planet has a radius similar to Jupiter and a cool temperature of approximately 282 Kelvin. Simulations also assessed whether this giant planet would disrupt potential Earth-like planets in the system's habitable zone, where liquid water could exist. The results indicate that the giant planet's orbital path and tilt play a critical role in the stability of such smaller, terrestrial worlds.

Key findings
- Candidate super-Jupiter identified with a mass of approximately 8 times that of Jupiter.
- The planet orbits at a distance of about 8 astronomical units from the 61 Cygni binary.
- The companion has an estimated radius of 1.02 Jupiter radii and a temperature of 282 Kelvin.
- Presence of this giant planet could disrupt the stability of terrestrial planets in the habitable zone depending on its orbit and tilt.

Scientific study

Worlds Next Door. V. A Candidate Solar System Scale Super-Jupiter in the 61 Cygni Binary System (external link)