AI 中文总结
本研究通过TESS发现三颗围绕类太阳恒星的近距巨行星候选体，经后续观测确认两颗真实行星，为研究近距系外行星迁移与半径膨胀提供样本。
AI 中文摘要
我们公布了由凌日系外行星勘测卫星（TESS）任务发现并经塔斯马尼亚大学格林希尔天文台（UTGO）观测研究的三颗南部凌星巨行星候选体。这些候选行星围绕薄盘G型主序星运行，其金属丰度接近太阳，轨道周期在2.9至3.3天之间，半径为1.1至1.3倍木星半径（R_J）。我们主要使用UTGO的哈林顿50厘米望远镜进行地基后续测光，随后采集了侦察光谱、高角分辨率成像和高精度视向速度数据，以排除假阳性情况。我们确认其中两个系统拥有真实系外行星并测定了其质量：TOI-3053b是一颗典型的热木星，质量M_{3053b}=0.85±0.12倍木星质量（M_J），整体密度ρ_{3053b}=0.64±0.10克每立方厘米（g cm^{-3}）；TOI-3278b/HATS-78b是一颗热土星质量行星，质量M_{3278b}=0.30±0.07倍木星质量，大气高度膨胀，密度ρ_{3278b}=0.21±0.05克每立方厘米。另一个候选体TOI-3272.01尚未得到确认，但符合热木星的特征，它的特别之处在于围绕一颗可能处于年轻到中年阶段的恒星运行，自转分析显示其年龄估计值T_{3272}=1.1±0.2亿年（Gyr）。这些系统丰富了TESS发现的热巨行星样本，可为近距系外行星总体的迁移路径和半径膨胀机制提供约束。
英文摘要
We present three southern transiting giant planet candidates alerted by the Transiting Exoplanet Survey Satellite (TESS) mission and investigated at the University of Tasmania Greenhill Observatory (UTGO). The candidate planets are orbiting thin disk G-dwarf main-sequence stars with roughly solar metallicity, possessing orbital periods between 2.9 - 3.3 days and radii of 1.1 - 1.3 $R_{J}$. We performed ground-based follow-up photometry primarily with the UTGO Harlingten 50 cm, then gathered reconnaissance spectra, high angular resolution imaging and high-precision radial velocities to rule out false positive scenarios. We confirmed that two of these systems host true exoplanets and constrained their masses. TOI-3053b is a typical hot Jupiter, with $M_{3053b} = 0.85 \pm 0.12$ M$_{J}$ and a bulk density of $ρ_{3053b} = 0.64 \pm 0.10$ g cm$^{-3}$. TOI-3278b / HATS-78b is a hot Saturn-mass planet ($M_{3278b} = 0.30 \pm 0.07$ $M_{J}$) with a highly inflated atmosphere and a low density of $ρ_{3278b} = 0.21 \pm 0.05$ g cm$^{-3}$. The other candidate (TOI-3272.01) remains unconfirmed, but appears consistent with being a hot Jupiter. TOI-3272.01 is notable as a candidate planet orbiting a potentially young to intermediate age star, with a rotational analysis indicating an age estimate of $T_{3272} = 1.1 \pm 0.2$ Gyr. These systems add to a growing sample of hot giant planets from TESS that may provide constraints on the migration pathways and radius inflation of the broader close-in exoplanet population.
CommentsAccepted for publication in PASA. 25 pages (14 page main text + 11 page appendix/references), 18 figures, 9 tables
