A Highly Eccentric Warm Jupiter Orbiting TIC 237913194
Trifonov, Trifon; Henning, Thomas; Latham, David W.; Quinn, Samuel N.; Jordán, Andrés; Espinoza, Néstor; Kossakowski, Diana; Brahm, Rafael; Hobson, Melissa J.; Rojas, Felipe I.; Schlecker, Martin; Vanderspek, Roland; Seager, Sara; Winn, Joshua N.; Jenkins, Jon M.; Mollière, Paul; Shporer, Avi; Rodriguez, Joseph E.; Bakos, Gáspár Á.; Carone, Ludmila; Molaverdikhani, Karan; Sarkis, Paula; Ricker, George; Rose, Mark E.; Vezie, Michael; Suc, Vincent; Rodriguez, David R.; Villaseñor, Jesus Noel; Bhatti, Waqas; Osip, David; Klahr, Hubert
Germany, Chile, United States
Abstract
The orbital parameters of warm Jupiters serve as a record of their formation history, providing constraints on formation scenarios for giant planets on close and intermediate orbits. Here, we report the discovery of TIC 237913194b, detected in full-frame images from Sectors 1 and 2 of the Transiting Exoplanet Survey Satellite (TESS), ground-based photometry (Chilean-Hungarian Automated Telescope, Las Cumbres Observatory Global Telescope), and Fiber-fed Extended Range Optical Spectrograph radial velocity time series. We constrain its mass to ${M}_{P}$ = ${1.942}_{-0.091}^{+0.091}$ ${M}_{J}$ and its radius to ${R}_{{\rm{P}}}$ = ${1.117}_{-0.047}^{+0.054}$ ${R}_{J}$ , implying a bulk density similar to Neptune's. It orbits a G-type star ( ${M}_{\star }$ = ${1.026}_{-0.055}^{+0.057}$ ${M}_{\odot }$ , V = 12.1 mag) with a period of 15.17 days on one of the most eccentric orbits of all known warm giants (e ≈ 0.58). This extreme dynamical state points to a past interaction with an additional, undetected massive companion. A tidal evolution analysis showed a large tidal dissipation timescale, suggesting that the planet is not a progenitor for a hot Jupiter caught during its high-eccentricity migration. TIC 237913194b further represents an attractive opportunity to study the energy deposition and redistribution in the atmosphere of a warm Jupiter with high eccentricity.