Journal
ASTRONOMICAL JOURNAL
Volume 166, Issue 5, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/1538-3881/acfc1d
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This paper presents the spectroscopic confirmation and precise mass measurement of the warm giant planet TOI-199 b. The planet was first identified in TESS photometry and confirmed using ground-based and space photometry, as well as radial velocities. It is the first warm exo-Saturn with a precisely determined mass and radius. The analysis of radial velocities and transit timing variations reveals the existence of a second planet in the system.
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 hr 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 104.854-0.002+0.001day period, a mass of 0.17 +/- 0.02 M J, and a radius of 0.810 +/- 0.005 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 (TTVs), 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 nontransiting companion TOI-199 c, which has a period of 273.69-0.22+0.26days and an estimated mass of 0.28-0.01+0.02MJ . This period places it within the conservative habitable zone.
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