标题： 一个高偏心率的温暖木星环绕TOI-4127 显示英文标题

标题： A High-Eccentricity Warm Jupiter Orbiting TOI-4127

摘要： 我们报告发现TOI-4127 b，这是一个在长周期（$P = 56.39879^{+0.00010}_{-0.00010}$d）、高偏心率轨道上围绕晚期F型矮星运行的凌日类木行星。这个温暖的木星最初是从TESS第二十象限数据中搜索单次凌日信号时被发现并识别为有前景的候选者，并在随后两次凌日（TESS第二十六和第五十三象限）以及使用NEID和SOPHIE光谱仪进行的地面后续径向速度观测后被确认为行星。我们联合拟合凌日和径向速度数据，以限制该系外行星的物理（$R_p = 1.096^{+0.039}_{-0.032} R_J$，$M_p = 2.30^{+0.11}_{-0.11} M_J$）和轨道参数。鉴于其高轨道偏心率（$e=0.7471^{+0.0078}_{-0.0086}$），TOI-4127 b是研究温暖木星群体和热木星形成路径的有力候选者。我们表明，TOI-4127 b目前的近日点距离太大，无法通过高偏心率潮汐迁移使其轨道圆形化，除非TOI-4127 b正在与一个未被探测到的外部伴星进行角动量交换，否则它不太可能是热木星的前身。尽管我们没有发现外部伴星的证据，但现有的观测数据不足以排除能够激发偏心率振荡并促进潮汐迁移的扰动者的存在。 显示英文摘要

摘要： We report the discovery of TOI-4127 b, a transiting, Jupiter-sized exoplanet on a long-period ($P = 56.39879^{+0.00010}_{-0.00010}$ d), high-eccentricity orbit around a late F-type dwarf star. This warm Jupiter was first detected and identified as a promising candidate from a search for single-transit signals in TESS Sector 20 data, and later characterized as a planet following two subsequent transits (TESS Sectors 26 and 53) and follow-up ground-based RV observations with the NEID and SOPHIE spectrographs. We jointly fit the transit and RV data to constrain the physical ($R_p = 1.096^{+0.039}_{-0.032} R_J$, $M_p = 2.30^{+0.11}_{-0.11} M_J$) and orbital parameters of the exoplanet. Given its high orbital eccentricity ($e=0.7471^{+0.0078}_{-0.0086}$), TOI-4127 b is a compelling candidate for studies of warm Jupiter populations and of hot Jupiter formation pathways. We show that the present periastron separation of TOI-4127 b is too large for high-eccentricity tidal migration to circularize its orbit, and that TOI-4127 b is unlikely to be a hot Jupiter progenitor unless it is undergoing angular momentum exchange with an undetected outer companion. Although we find no evidence for an external companion, the available observational data are insufficient to rule out the presence of a perturber that can excite eccentricity oscillations and facilitate tidal migration.