We report the discovery of two short-period Saturn-mass planets, one transiting the G subgiant TOI-954 (TIC 44792534, $ V = 10.343 $, $ T = 9.78 $) observed in TESS sectors 4 and 5, and one transiting the G dwarf K2-329 (EPIC 246193072, $ V = 12.70 $, $ K = 10.67 $) observed in K2 campaigns 12 and 19. We confirm and characterize these two planets with a variety of ground-based archival and follow-up observations, including photometry, reconnaissance spectroscopy, precise radial velocity, and high-resolution imaging. Combining all available data, we find that TOI-954 b has a radius of $0.852_{-0.062}^{+0.053} \, R_{\mathrm{J}}$ and a mass of $0.174_{-0.017}^{+0.018} \, M_{\mathrm{J}}$ and is in a 3.68 day orbit, while K2-329 b has a radius of $0.774_{-0.024}^{+0.026} \, R_{\mathrm{J}}$ and a mass of $0.260_{-0.022}^{+0.020} \, M_{\mathrm{J}}$ and is in a 12.46 day orbit. As TOI-954 b is 30 times more irradiated than K2-329 b but more or less the same size, these two planets provide an opportunity to test whether irradiation leads to inflation of Saturn-mass planets and contribute to future comparative studies that explore Saturn-mass planets at contrasting points in their lifetimes.

中文翻译：

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TOI-954 b 和 K2-329 b：测试辐射是否导致通货膨胀的短周期土星质量行星

我们报告发现了两颗短周期土星质量的行星，一颗在 TESS 扇区 4 和 5 中观察到穿过 G 次巨星 TOI-954（TIC 44792534，$ V = 10.343 $，$ T = 9.78 $），另一颗穿过在 K2 活动 12 和 19 中观察到的 G 矮星 K2-329（EPIC 246193072，$ V = 12.70 $，$ K = 10.67 $）。我们通过各种地面档案和后续观测确认并表征了这两个行星，包括光度测量、侦察光谱、精确径向速度和高分辨率成像。结合所有可用数据，我们发现 TOI-954 b 的半径为 $0.852_{-0.062}^{+0.053} \, R_{\mathrm{J}}$ 和质量 $0.174_{-0.017}^{ +0.018} \, M_{\mathrm{J}}$ 并且在 3.68 天的轨道上，而 K2-329 b 的半径为 $0.774_{-0.024}^{+0.026} \, R_{\mathrm{J }}$ 和质量 $0.260_{-0.022}^{+0.020} \, M_{\mathrm{J}}$ 并且在 12.46 天的轨道上。由于 TOI-954 b 的辐射量是 K2-329 b 的 30 倍，但大小大致相同，因此这两颗行星提供了测试辐射是否会导致土星质量行星膨胀的机会，并有助于未来探索土星的比较研究-质量行星在其生命周期的对比点。