TOI-199 b: A well-characterized 100-day transiting warm giant planet with TTVs seen from Antarctica
Melissa J. Hobson, Trifon Trifonov, Thomas Henning, Andr\'es Jord\'an,, Felipe Rojas, Nestor Espinoza, Rafael Brahm, Jan Eberhardt, Mat\'ias I., Jones, Djamel Mekarnia, Diana Kossakowski, Martin Schlecker, Marcelo Tala, Pinto, Pascal Jos\'e Torres Miranda, Lyu Abe

TL;DR
This paper confirms and characterizes the warm giant exoplanet TOI-199 b using multi-source photometry and spectroscopy, revealing transit timing variations indicative of a second planet near the habitable zone.
Contribution
It provides the first precise mass and radius measurement of a warm exo-Saturn and detects a non-transiting companion through combined TTV and RV analysis.
Findings
TOI-199 b has a 104.85-day orbit, mass of 0.17 M_J, and radius of 0.81 R_J.
Transit timing variations suggest a second planet, TOI-199 c, with a 273.69-day period.
TOI-199 c's orbit lies within the conservative Habitable Zone.
Abstract
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 6.5h 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 period, a mass of , and a radius of . 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…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Astro and Planetary Science
