TOI-954 b and EPIC 246193072 b: Short-Period Saturn-Mass Planets that Test Whether Irradiation Leads to Inflation

摘要: We report the discovery of two short-period Saturn-mass planets, one transiting G subgiant TOI-954 (TIC 44792534, $ V = 10.343 $, T 9.78 $) observed in TESS Sectors 4 & 5, and dwarf EPIC 246193072 ($ 12.70 K 10.67 K2 Campaigns 12 19. confirm characterize these planets with a variety ground-based archival follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, high-resolution imaging. Combining all available data, we find that b has radius $0.852_{-0.062}^{+0.053} \, R_{\mathrm{J}}$ mass $0.174_{-0.017}^{+0.018} M_{\mathrm{J}}$ is 3.68 d orbit, while $0.774_{-0.024}^{+0.026} $0.260_{-0.022}^{+0.020} 12.46 orbit. As 30 times more irradiated than but or less same size, provide an opportunity to test whether irradiation leads inflation contribute future comparative studies explore at contrasting points their lifetimes.