Another Shipment of Six Short-Period Giant Planets from TESS

Abstract

We present the discovery and characterization of six short-period, transiting giant planets from NASA's Transiting Exoplanet Survey Satellite (TESS) -- TOI-1811 (TIC 376524552), TOI-2025 (TIC 394050135), TOI-2145 (TIC 88992642), TOI-2152 (TIC 395393265), TOI-2154 (TIC 428787891), & TOI-2497 (TIC 97568467). All six planets orbit bright host stars (8.9 <G< 11.8, 7.7 <K< 10.1). Using a combination of time-series photometric and spectroscopic follow-up observations from the TESS Follow-up Observing Program (TFOP) Working Group, we have determined that the planets are Jovian-sized (R${}_P$ = 1.00-1.45 R${}_J$), have masses ranging from 0.92 to 5.35 M${}_J$, and orbit F, G, and K stars (4753 $<$ T${}_{eff}$ $<$ 7360 K). We detect a significant orbital eccentricity for the three longest-period systems in our sample: TOI-2025 b (P = 8.872 days, $e$ = $0.220\pm 0.053$), TOI-2145 b (P = 10.261 days, $e$ = $0.182_{-0.049}^{+0.039}$), and TOI-2497 b (P = 10.656 days, $e$ = $0.196_{-0.053}^{+0.059}$). TOI-2145 b and TOI-2497 b both orbit subgiant host stars (3.8 $<$ $\log$ g $<$4.0), but these planets show no sign of inflation despite very high levels of irradiation. The lack of inflation may be explained by the high mass of the planets; $5.35_{-0.35}^{+0.32}$ M${}_{\mathrm{J}}$ (TOI-2145 b) and $5.21\pm 0.52$ M${}_{\mathrm{J}}$ (TOI-2497 b). These six new discoveries contribute to the larger community effort to use {\it TESS} to create a magnitude-complete, self-consistent sample of giant planets with well-determined parameters for future detailed studies.

arXiv comment20 Pages, 6 Figures, 8 Tables, Accepted by MNRAS

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