Twenty-nine giant planets confirmed around bright stars using TESS data

A large-scale analysis of TESS mission data has confirmed 29 new hot and warm Jupiter-sized planets orbiting bright stars. By using space-based transits and ground-based observations, the study provides a consistent dataset of these massive worlds, revealing new details about their orbits, masses, and stellar environments, including the identification of three new bound stellar companions in these systems.

Star system: TOI-4079 A | Distance from the Sun: 1186 light years

The study presents the characterization of 29 new giant planets, often categorized as hot or warm Jupiters due to their massive size and proximity to their host stars. These planets were identified as they transited—or passed in front of—their host stars, which are bright stars similar in type to our Sun (specifically FGK-type stars). In addition to confirming these 29 worlds, the analysis identified three previously unknown bound stellar companions, specifically TOI-3988 B, TOI-6171 B, and TOI-7266 B, which orbit their respective host stars.

Researchers utilized data from the Transiting Exoplanet Survey Satellite (TESS), complemented by ground-based photometry (measuring light intensity) and spectroscopy (analyzing the light spectrum to determine composition and movement). To ensure precision, the team employed a computational method called Markov-Chain Monte Carlo analysis, specifically using the EXOFASTv2 code. This allowed them to model the planetary systems consistently, providing reliable data on orbital periods ranging from roughly 1 to 17 days, masses between 0.35 and 8.7 times that of Jupiter, and varying levels of orbital eccentricity—a measure of how elongated or oval-shaped an orbit is rather than a perfect circle.

Beyond individual planet characterization, the analysis compared this sample to existing populations of giant planets. By using statistical tests to compare host star mass, surface gravity, and metallicity, researchers found differences between this new sample and previously cataloged systems, likely stemming from more precise constraints on host star density gained from the transit data. Notably, seven of the confirmed planets exhibit significant orbital eccentricity, and the system hosting TOI-3365 b appears to contain a massive outer companion, providing further insight into how giant planets migrate within their systems over time.

Key findings
Confirmation of 29 new hot and warm Jupiter-sized exoplanets orbiting bright stars.
Discovery of three new stellar companions: TOI-3988 B, TOI-6171 B, and TOI-7266 B.
Planetary orbital periods observed range between 1.28 and 16.9 days.
Masses of the confirmed planets span from 0.35 to 8.7 times the mass of Jupiter.
Seven of the new planets demonstrate significant orbital eccentricity.

Scientific study

Migration and Evolution of giant ExoPlanets (MEEP). III. Twenty-Nine Giant Planets from the TESS Mission (external link)