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TOI-2202 b is a transiting warm Jovian-mass planet with an orbital period ofP=11.91 days identified from the Full Frame Images data of five differentsectors of the TESS mission. Ten TESS transits of TOI-2202 b combined withthree follow-up light curves obtained with the CHAT robotic telescope showstrong transit timing variations (TTVs) with an amplitude of about 1.2 hours.Radial velocity follow-up with FEROS, HARPS and PFS confirms the planetarynature of the transiting candidate (a$_{\rm b}$ = 0.096 $\pm$ 0.002 au, m$_{\rmb}$ = 0.98 $\pm$ 0.06 M$_{\rm Jup}$), and dynamical analysis of RVs, transitdata, and TTVs points to an outer Saturn-mass companion (a$_{\rm c}$ = 0.155$\pm$ 0.003 au, m$_{\rm c}$= $0.37 \pm 0.10$ M$_{\rm Jup}$) near the 2:1 meanmotion resonance. Our stellar modeling indicates that TOI-2202 is an earlyK-type star with a mass of 0.82 M$_\odot$, a radius of 0.79 R$_\odot$, andsolar-like metallicity. The TOI-2202 system is very interesting because of thetwo warm Jovian-mass planets near the 2:1 MMR, which is a rare configuration,and their formation and dynamical evolution are still not well understood.

A pair of warm giant planets near the 2:1 mean motion resonance around the K-dwarf star TOI-2202