Two Massive Jupiters in Eccentric Orbits from the TESS Full-frame Images

Ikwut-Ukwa, Mma and Rodriguez, Joseph E. and Quinn, Samuel N. and Zhou, George ORCID: and Vanderburg, Andrew and Ali, Asma and Bunten, Katya and Gaudi, B. Scott and Latham, David W. and Howell, Steve B. and Huang, Chelsea X. ORCID: and Bieryla, Allyson and Collins, Karen A. and Carmichael, Theron W. and Rabus, Markus and Eastman, Jason D. and Collins, Kevin I. and Tan, Thiam-Guan and Schwarz, Richard P. and Myers, Gordon and Stockdale, Chris and Kielkopf, John F. and Radford, Don J. and Oelkers, Ryan J. and Jenkins, Jon M. and Ricker, George R. and Seager, Sara and Vanderspek, Roland K. and Winn, Joshua N. and Burt, Jennifer and Butler, R. Paul and Calkins, Michael L. and Crane, Jeffrey D. and Gnilka, Crystal L. and Esquerdo, Gilbert A. and Fong, William and Kreidberg, Laura and Mink, Jessica and Rodriguez, David R. and Schlieder, Joshua E. and Shectman, Stephen and Shporer, Avi and Teske, Johanna and Ting, Eric B. and Villasenor, Jesus Noel and Yahalomi, Daniel A. (2022) Two Massive Jupiters in Eccentric Orbits from the TESS Full-frame Images. The Astronomical Journal, 163 (1):9. pp. 1-15. ISSN 0004-6256

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We report the discovery of two short-period massive giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS). Both systems, TOI-558 (TIC 207110080) and TOI-559 (TIC 209459275), were identified from the 30 minute cadence full-frame images and confirmed using ground-based photometric and spectroscopic followup observations from TESS's follow-up observing program working group. We find that TOI-558 b, which transits an F-dwarf (M-* =1.349(-0.065)(+0.064) M-circle dot, R-* =1.496(-0.040)(+0.042) R-circle dot, T-eff = 6466(-93)(+95) K, age 1.79(-0.73)(+0.91) Gyr) with an orbital period of 14.574 days, has a mass of 3.61 +/- 0.15 M-J, a radius of 1.086(-0.038)(+0.041) R-J, and an eccentric (e = 0.300(-0.020)(+0.022)) orbit. TOI-559 b transits a G dwarf (M-* = 1.026 +/- 0.057 M-circle dot, R-* =1.233(-0.026)(+0.028) R-circle dot, T-eff = 5925(-76)(+85) K, age 6.8(-2.0)(+2.5) Gyr) in an eccentric (e = 0.151 +/- 0.011) 6.984 days orbit with a mass of 6.01(-0.23)(+0.24) M-J and a radius of 1.091(-0.025+)(0.028) R-J. Our spectroscopic follow up also reveals a long-term radial velocity trend for TOI-559, indicating a long-period companion. The statistically significant orbital eccentricity measured for each system suggests that these planets migrated to their current location through dynamical interactions. Interestingly, both planets are also massive (>3 M-J), adding to the population of massive giant planets identified by TESS. Prompted by these new detections of high-mass planets, we analyzed the known mass distribution of hot and warm Jupiters but find no significant evidence for multiple populations. TESS should provide a near magnitude-limited sample of transiting hot Jupiters, allowing for future detailed population studies.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 12 May 2022 04:45
Last Modified: 12 May 2022 04:45
Uncontrolled Keywords: Hot Jupiters (753); Exoplanets (498); Extrasolar gaseous planets (2172); Exoplanet astronomy (486); Transit photometry (1709); Photometry (1234); Exoplanet detection methods (489); Radial velocity (1332); Direct imaging (387); Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
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