An Eccentric Massive Jupiter Orbiting a Subgiant on a 9.5-day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images

Rodriguez, Joseph E.; Quinn, Samuel N.; Huang, Chelsea X.; Vanderburg, Andrew; Penev, Kaloyan; Brahm, Rafael; Jordán, Andrés; Ikwut-Ukwa, Mma; Tsirulik, Shelly; Latham, David W.; Stassun, Keivan G.; Shporer, Avi; Ziegler, Carl; Matthews, Elisabeth; Eastman, Jason D.; Gaudi, B. Scott; Collins, Karen A.; Guerrero, Natalia; Relles, Howard M.; Barclay, Thomas; Batalha, Natalie M.; Berlind, Perry; Bieryla, Allyson; Bouma, L. G.; Boyd, Patricia T.; Burt, Jennifer; Calkins, Michael L.; Christiansen, Jessie; Ciardi, David R.; Colón, Knicole D.; Conti, Dennis M.; Crossfield, Ian J. M.; Daylan, Tansu; Dittmann, Jason; Dragomir, Diana; Dynes, Scott; Espinoza, Néstor; Esquerdo, Gilbert A.; Essack, Zahra; Soto, Aylin Garcia; Glidden, Ana; Günther, Maximilian N.; Henning, Thomas; Jenkins, Jon M.; Kielkopf, John F.; Krishnamurthy, Akshata; Law, Nicholas M.; Levine, Alan M.; Lewin, Pablo; Mann, Andrew W.; Morgan, Edward H.; Morris, Robert L.; Oelkers, Ryan J.; Paegert, Martin; Pepper, Joshua; Quintana, Elisa V.; Ricker, George R.; Rowden, Pamela; Seager, Sara; Sarkis, Paula; Schlieder, Joshua E.; Sha, Lizhou; Tokovinin, Andrei; Torres, Guillermo; Vanderspek, Roland K.; Villanueva, Steven; Villaseñor, Jesus Noel; Winn, Joshua N.; Wohler, Bill; Wong, Ian; Yahalomi, Daniel A.; Yu, Liang; Zhan, Zhuchang and Zhou, George (2019). An Eccentric Massive Jupiter Orbiting a Subgiant on a 9.5-day Period Discovered in the Transiting Exoplanet Survey Satellite Full Frame Images. The Astronomical Journal, 157(5), article no. 191.

DOI: https://doi.org/10.3847/1538-3881/ab11d9

Abstract

We report the discovery of TOI-172 b from the Transiting Exoplanet Survey Satellite (TESS) mission, a massive hot Jupiter transiting a slightly evolved G star with a 9.48-day orbital period. This is the first planet to be confirmed from analysis of only the TESS full frame images, because the host star was not chosen as a two-minute cadence target. From a global analysis of the TESS photometry and follow-up observations carried out by the TESS Follow-up Observing Program Working Group, TOI-172 (TIC 29857954) is a slightly evolved star with an effective temperature of T eff = 5645 ± 50 K, a mass of M ⋆ = -0.061+0.065 M ⊙, radius of R ⋆ = -0.044+0.047 R ⊙, a surface gravity of log g ⋆ = -0.028+0.027, and an age of -1.5+1.6 . Its planetary companion (TOI-172 b) has a radius of R P = -0.029+0.032 R J, a mass of M P = -0.20+0.22 M J, and is on an eccentric orbit (e=-0.0090+0.0093). TOI-172 b is one of the few known massive giant planets on a highly eccentric short-period orbit. Future study of the atmosphere of this planet and its system architecture offer opportunities to understand the formation and evolution of similar systems.

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