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We present the discovery of a pair of transiting giant planets, TOI-216b andc, using four sectors of TESS photometry. TOI-216 is a $0.87 M_{\odot}$ dwarforbited by two transiters with radii of $8.2 R_{\oplus}$ and $11.3 R_{\oplus}$,and periods of $17.01$d and $34.57$d, respectively. Anti-correlated TTVs areclearly evident indicating that the transiters orbit the same star and interactvia a near 2:1 mean motion resonance. By fitting the TTVs with a dynamicalmodel, we infer masses of $26_{-11}^{+24} M_{\oplus}$ and $190_{-80}^{+220}M_{\oplus}$, establishing that the objects are planetary in nature and havelikely sub-Kronian and Kronian densities. TOI-216 lies close to the southernecliptic pole and thus will be observed by TESS throughout the first year,providing an opportunity for continuous dynamical monitoring and considerablerefinement of the dynamical masses presented here. TOI-216 closely resemblesKepler-9 in architecture, and we hypothesize that in such systems theseSaturn-analogs failed to fully open a gap and thus migrated far deeper into thesystem before becoming trapped into resonance, which would imply that futuredetections of new analogs may also have sub-Jupiter masses.

A resonant pair of warm giant planets revealed by TESS