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A Pair of Warm Giant Planets near the 2:1 Mean Motion Resonance around the K-dwarf Star TOI-2202*

2021; Institute of Physics; Volume: 162; Issue: 6 Linguagem: Inglês

10.3847/1538-3881/ac1bbe

1538-3881

T. Trifonov, Rafael Brahm, Néstor Espinoza, Thomas Henning, Andrés Jordán, David Nesvorný, Rebekah I. Dawson, Jack J. Lissauer, Man Hoi Lee, D. Kossakowski, Felipe Rojas, Mélissa J. Hobson, P. Sarkis, Martin Schlecker, Bertram Bitsch, G. Á. Bakos, M. Barbieri, W. Bhatti, R. Paul Butler, Jeffrey D. Crane, Sangeetha Nandakumar, Matías R. Díaz, Stephen A. Shectman, Johanna Teske, P. Torres, V. Suc, José I Vines, Sharon X. Wang, G. Ricker, Avi Shporer, Andrew Vanderburg, Diana Dragomir, R. Vanderspek, Christopher J. Burke, Tansu Daylan, Bernie Shiao, Jon M. Jenkins, Bill Wohler, Sara Seager, Joshua N. Winn,

Astrophysics and Star Formation Studies

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.