Statistical analysis confirms TOI-7701 b as a sub-Saturn planet orbiting a subgiant star

Star system: TOI-7701 | Distance from the Sun: 1253 light years

TOI-7701 b (TOI-7701.01) is a transiting object orbiting a bright F-type subgiant star. Initially identified as a candidate in a machine-learning survey, its true nature as a planet had remained uncertain until now. New statistical analysis has confirmed this object as a sub-Saturn, placing it at the critical boundary between giant planets and low-mass brown dwarfs, which are objects larger than planets but smaller than stars.

The confirmation was achieved through an independent statistical pipeline that evaluated the likelihood of the object being a true planet versus a false positive, such as a background star. By using the triceratops Bayesian framework—a mathematical method to estimate the probability of different celestial scenarios—the analysis determined the object's physical dimensions with high confidence.

The findings relied on multi-sector space data, comparing raw light measurements with corrected versions to ensure accuracy. The results show a physical radius characteristic of a planet rather than a brown dwarf. This robust validation provides a clear path for future observations, such as radial velocity measurements, to further detail the mass and orbital characteristics of this planetary companion.

Key findings
- TOI-7701.01 is confirmed as a planetary companion orbiting an F-type subgiant host star.
- The object resides at the boundary between giant planets and brown dwarfs, with a size typical of a planet.
- Independent statistical validation confirms the planetary nature with a very low false positive probability.
- The physical scale of the object was consistently derived using both raw and instrumentally corrected data sets.

Scientific study

Comprehensive Statistical Validation of TOI-7701.01: A Sub-Saturn Companion at the Giant Planet Boundary (external link)