标题： PLATO探测银河系恒星种群中的系外行星：估计FGK星在薄盘、厚盘和恒星晕中的系外行星产量 显示英文标题

标题： Exoplanets Across Galactic Stellar Populations with PLATO: Estimating Exoplanet Yields Around FGK Stars for the Thin Disk, Thick Disk and Stellar Halo

摘要： 本研究旨在评估即将开展的PLATO任务在不同银河环境中的恒星周围调查系外行星种群的潜力，特别关注银河系薄盘、厚盘和恒星晕。 我们旨在量化PLATO在每种环境中探测行星的能力，并确定这些观测如何约束行星形成模型。 从全天空PLATO输入星表出发，我们将240万颗FGK型恒星根据运动学特征分类到各自的银河成分中。 对于长观测时间的LOPS2和LOP N1 PLATO区域中的子样本恒星，我们使用新一代行星种群合成（NGPPS）数据集来估算行星出现率。 将这些估计值与PLATO检测效率模型相结合，我们预测了在标准2+2年任务期间每种银河环境中预期的行星产量。 根据我们的分析，PLATO很可能在α元素富集的厚盘恒星周围探测到至少400颗系外行星。 其中大部分行星预计为超级地球和亚海王星，半径在2至10倍地球半径之间，轨道周期在2至50天之间，适合研究半径空隙与恒星化学成分之间的联系。 对于金属贫乏的晕，PLATO可能探测到1至80颗行星，轨道周期在10至50天之间，这取决于行星形成是否存在金属度阈值。 PLATO区域中包含超过3,400颗潜在目标恒星，其[Fe/H] < -0.6，这将有助于改善我们对金属贫乏恒星周围行星的理解。 我们识别出一个特定的目标列表，共47颗（运动学分类的）晕星，在高优先级、高信噪比的PLATO P1样本中，这为在金属贫乏环境中寻找行星提供了绝佳机会。 显示英文摘要

摘要： This study aims to assess the potential of the upcoming PLATO mission to investigate exoplanet populations around stars in diverse Galactic environments, specifically focusing on the Milky Way thin disk, thick disk, and stellar halo. We aim to quantify PLATOs ability to detect planets in each environment and determine how these observations could constrain planet formation models. Beginning from the all-sky PLATO Input Catalog, we kinematically classify the 2.4 million FGK stars into their respective Galactic components. For the sub-sample of stars in the long-observation LOPS2 and LOPN1 PLATO fields, we estimate planet occurrence rates using the New Generation Planet Population Synthesis (NGPPS) dataset. Combining these estimates with a PLATO detection efficiency model, we predicted the expected planet yields for each Galactic environment during a nominal 2+2 year mission. Based on our analysis, PLATO is likely to detect at least 400 exoplanets around the alpha-enriched thick disk stars. The majority of those planets are expected to be Super-Earths and Sub-Neptunes with radii between 2 and 10 Earth radii and orbital periods between 2 and 50 days, ideal for studying the link between the radius valley and stellar chemistry. For the metal-poor halo, PLATO is likely to detect between 1 and 80 planets with periods between 10 and 50 days, depending on the potential existence of a metallicity threshold for planet formation. The PLATO fields contain more than 3,400 potential target stars with [Fe/H] < -0.6, which will help to improve our understanding of planets around metal-poor stars. We identify a specific target list of 47 (kinematically classified) halo stars in the high-priority, high-SNR PLATO P1 sample, offering prime opportunities in the search for planets in metal-poor environments.