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 follow-up observations from TESS's Follow-up Observing Program Working Group. We find that TOI-558 b, which transits an F-dwarf ($M_{ *}=1.349^{ +0.064}_{ -0.065}\ M_{ \odot}$, $R_{ *}=1.496^{ +0.042}_{ -0.040}\ R_{ \odot}$, $T_{ eff}=6466^{ +95}_{ -93}\ K$, age $1.79^{ +0.91}_{ -0.73}\ Gyr$) with an orbital period of 14.574 days, has a mass of $3.61\pm0.15\ M_{ \rm J}$, a radius of $1.086^{ +0.041}_{ -0.038}\ R_{ \rm J}$, and an eccentric (e=$0.300^{ +0.022}_{ -0.020}$) orbit. TOI-559 b transits a G-dwarf ($M_{ *}=1.026\pm0.057\ M_{ \odot}$, $R_{ *}=1.233^{ +0.028}_{ -0.026}\ R_{ \odot}$, $T_{ eff}=5925^{ +85}_{ -76}\ K$, age $6.8^{ +2.5}_{ -2.0}\ Gyr$) in an eccentric (e=$0.151\pm0.011$) 6.984-day orbit with a mass of $6.01^{ +0.24}_{ -0.23}\ M_{ \rm J}$ and a radius of $1.091^{ +0.028}_{ -0.025}\ R_{ \rm J}$. 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 ($>3\ M_{ \rm J}$), 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.
Categories: astro-ph.EP astro-ph.SR
