TOI-201 c and TOI-1670 d: two new planets in warm Jupiter systems discovered by TESS

We report the discovery and validation of two new planets in two systems with warm Jupiters first discovered by the Transiting Exoplanet Survey Satellite (TESS). TOI-201 c is a super-Earth with a radius of 1.64 Earth radii around a young active star on a 5.85 d orbit interior to the warm Jupiter TOI-201 b. TOI-1670 d is a sub-Neptune with a radius of 3.10 Earth radii on a 123.06 d orbit exterior to the sub-Neptune TOI-1670 b and warm Jupiter TOI-1670 c. We use the TESS observations alongside follow-up observations to statistically validate the two planets. The two systems add to the growing list of warm Jupiters with nearby companions. Furthermore, the two systems are well-suited for follow-up observations to further characterize their orbits and compositions, which will give insight into the formation and evolutionary history of these types of planetary systems. In particular, the TOI-1670 system lies near a 1:4:12 mean-motion resonance, a possible result of planet migration.