TOI-7510: A solar-analog system of three transiting giant planets near a Laplace resonance chain

TL;DR

This paper confirms a three-planet system around TOI-7510, with giant planets near a Laplace resonance, exhibiting significant transit timing variations, and provides initial mass and orbital characterizations.

Contribution

First detailed characterization of a three-giant-planet system near a Laplace resonance around a solar analog, including mass, radius, and dynamical analysis.

Findings

System consists of three giant planets with radii 0.65, 0.96, and 0.94 R_J.

Planets have orbital periods of 11.5, 22.6, and 48.9 days.

Large transit timing variations observed due to near-resonant configuration.

Abstract

We report the confirmation and initial characterization of a compact and dynamically rich multiple giant planet system orbiting the solar analog TOI-7510. The system was recently identified as a candidate two-planet system in a machine-learning search of the TESS light curves. Using TESS data and photometric follow-up observations with ASTEP, CHEOPS, and EulerCam, we show that one transit was initially misattributed and that the system consists of three transiting giant planets with orbital periods of 11.5, 22.6, and 48.9 days. The planets have radii of 0.65, 0.96, and 0.94 R_J, making them the largest known trio of transiting planets. The system architecture lies near a 4:2:1 mean motion resonant chain, inducing large transit timing variations for all three planets. Photodynamical modeling gives mass estimates of 0.057, 0.41, and 0.60 M_J and favors low eccentricities and mutual inclinations. TOI-7510 is an interesting system for investigating the dynamical interactions and formation histories of compact systems of giant planets.