Abstract
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
−
0.065
+
0.064
M
⊙, R
* =
1.496
−
0.040
+
0.042
R
⊙, 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
⊙, R
* =
1.233
−
0.026
+
0.028
R
⊙, 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.
Hot Jupiters and Hot Spots: The Short‐ and Long‐Term Chromospheric Activity on Stars with Giant Planets
