학술논문
TOI-199 b: A Well-characterized 100 day Transiting Warm Giant Planet with TTVs Seen from Antarctica
Document Type
article
Author
Melissa J. Hobson; Trifon Trifonov; Thomas Henning; Andrés Jordán; Felipe Rojas; Nestor Espinoza; Rafael Brahm; Jan Eberhardt; Matías I. Jones; Djamel Mekarnia; Diana Kossakowski; Martin Schlecker; Marcelo Tala Pinto; Pascal José Torres Miranda; Lyu Abe; Khalid Barkaoui; Philippe Bendjoya; François Bouchy; Marco Buttu; Ilaria Carleo; Karen A. Collins; Knicole D. Colón; Nicolas Crouzet; Diana Dragomir; Georgina Dransfield; Thomas Gasparetto; Robert F. Goeke; Tristan Guillot; Maximilian N. Günther; Saburo Howard; Jon M. Jenkins; Judith Korth; David W. Latham; Monika Lendl; Jack J. Lissauer; Christopher R. Mann; Ismael Mireles; George R. Ricker; Sophie Saesen; Richard P. Schwarz; S. Seager; Ramotholo Sefako; Avi Shporer; Chris Stockdale; Olga Suarez; Thiam-Guan Tan; Amaury H. M. J. Triaud; Solène Ulmer-Moll; Roland Vanderspek; Joshua N. Winn; Bill Wohler; George Zhou
Source
The Astronomical Journal, Vol 166, Iss 5, p 201 (2023)
Subject
Language
English
ISSN
1538-3881
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 6.5 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 ${104.854}_{-0.002}^{+0.001}\,{\rm{day}}$ 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 ${273.69}_{-0.22}^{+0.26}\,{\rm{days}}$ and an estimated mass of ${0.28}_{-0.01}^{+0.02}\,{M}_{{\rm{J}}}$ . This period places it within the conservative habitable zone.