Convergent disk migration has long been suspected to be responsible for forming planetary systems with a chain of mean-motion resonances (MMR). Dynamical evolution over time could disrupt the resonant configuration to form the non-resonant Kepler multi-planet systems. We present TOI-1136, a 700-Myr old G star with 6 transiting planets in a chain of mean-motion resonances. The orbital period ratios deviate from exact commensurability by only 1e-4, smaller than the deviations of 1e-2 seen in mature Kepler near-resonant systems. TOI-1136 appears to be a pristine example of the orbital architecture emerging from convergent disk migration before dynamical processes disrupt the resonance. The resonant chain also contains a very delicate 7:5, 2nd order resonance that favors a gentle Type-I migration in a low-density disk with an inner edge at about 0.05AU.
Dr Fei Dai is currently a NASA Sagan fellow at Caltech. Dr Dai will be starting a faculty position at the University of Hawaiʻi in 2024. Using both novel data analysis techniques and numerical simulations, He strives to understand the formation, evolution, and habitability of planetary systems. He obained his Ph.D degree in Physics from MIT, and BA from Univerisity of Cambridge.