Kavli Affiliate: Robert Goeke
| Summary:
We present the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI-199 b. This planet was first identified in TESS photometry and confirmed using ground-based photometry from ASTEP in Antarctica including a full 6.5$,$h long transit, PEST, Hazelwood, and LCO; space photometry from NEOSSat; and radial velocities (RVs) from FEROS, HARPS, CORALIE, and CHIRON. Orbiting a late G-type star, TOI-199,b has a $mathrm104.854_-0.002^+0.001 , d$ period, a mass of $mathrm0.17pm0.02 , M_J$, and a radius of $mathrm0.810pm0.005 , R_J$. It is the first warm exo-Saturn with a precisely determined mass and radius. The TESS and ASTEP transits show strong transit timing variations, pointing to the existence of a second planet in the system. The joint analysis of the RVs and TTVs provides a unique solution for the non-transiting companion TOI-199 c, which has a period of $mathrm273.69_-0.22^+0.26 , d$ and an estimated mass of $mathrm0.28_-0.01^+0.02 , M_J$. This period places it within the conservative Habitable Zone.
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