A pair of warm giant planets near the 2:1 mean motion resonance around the K-dwarf star TOI-2202
astro-ph.EP
/ Authors
Trifon Trifonov, Rafael Brahm, Nestor Espinoza, Thomas Henning, Andrés Jordán, David Nesvorny, Rebekah I. Dawson, Jack J. Lissauer, Man Hoi Lee, Diana Kossakowski
and 30 more authors
Felipe I. Rojas, Melissa J. Hobson, Paula Sarkis, Martin Schlecker, Bertram Bitsch, Gaspar Á. Bakos, Mauro Barbieri, Waqas Bhatti, R. Paul Butler, Jeffrey D. Crane, Sangeetha Nandakumar, Matías R. Díaz, Stephen Shectman, Johanna Teske, Pascal Torres, Vincent Suc, Jose I. Vines, Sharon X. Wang, George R. Ricker, Avi Shporer, Andrew Vanderburg, Diana Dragomir,
/ Abstract
TOI-2202 b is a transiting warm Jovian-mass planet with an orbital period of P=11.91 days identified from the Full Frame Images data of five different sectors of the TESS mission. Ten TESS transits of TOI-2202 b combined with three follow-up light curves obtained with the CHAT robotic telescope show strong transit timing variations (TTVs) with an amplitude of about 1.2 hours. Radial velocity follow-up with FEROS, HARPS and PFS confirms the planetary nature of the transiting candidate (a$_{\rm b}$ = 0.096 $\pm$ 0.002 au, m$_{\rm b}$ = 0.98 $\pm$ 0.06 M$_{\rm Jup}$), and dynamical analysis of RVs, transit data, and TTVs points to an outer Saturn-mass companion (a$_{\rm c}$ = 0.155 $\pm$ 0.003 au, m$_{\rm c}$= $0.37 \pm 0.10$ M$_{\rm Jup}$) near the 2:1 mean motion resonance. Our stellar modeling indicates that TOI-2202 is an early K-type star with a mass of 0.82 M$_\odot$, a radius of 0.79 R$_\odot$, and solar-like metallicity. The TOI-2202 system is very interesting because of the two warm Jovian-mass planets near the 2:1 MMR, which is a rare configuration, and their formation and dynamical evolution are still not well understood.