发表机构
Penn State University; Università di Padova; INAF, Osservatorio Astronomico di Padova; INAF, Osservatorio Astrofisico di Catania; University of Oxford（宾夕法尼亚州立大学; 帕多瓦大学; 意大利国家天体物理研究所，帕多瓦天文台; 意大利国家天体物理研究所，卡塔尼亚天文台; 牛津大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究评估ARPS方法在模拟PLATO光变曲线上对小凌星行星的探测性能，发现短周期地球大小行星恢复率较高，并讨论了方法学影响。
AI 中文摘要
目的。本研究利用基于模拟光变曲线的自回归行星搜索（ARPS）方法，考察PLATO任务对小尺寸凌星行星（半径在0.5至2.0个地球半径之间）的探测灵敏度。方法。研究分析了数千条来自磁活动恒星的PLATO-like模拟光变曲线，这些恒星预期来自PLATO长观测阶段南2（LOPS2）天区，并注入了半径小于2.0个地球半径的凌星行星信号。光变曲线采用ARPS方法进行分析，该方法利用自回归建模对非行星信号进行滤波，并使用凌星梳状滤波器周期图进行行星凌星探测。通过对两个ARPS参数（峰值周期图功率和凌星持续时间）设置阈值，减少了不存在的周期信号的误报。结果。当应用于PLATO模拟的前三个月亮星观测数据（P1和P2样本）时，对于周期短于40天的地球大小行星，至少50%被恢复。在LOPS2两年的观测中，对于周期小于240天的行星，25%被恢复。讨论了方法在去趋势、周期图、误报、审查和星表评估方面的影响。展示了探测和审查后阳性预测值热图的实用性。结论。虽然ARPS行星探测程序并非完全适合PLATO分析，但本研究为小尺寸凌星行星探测的灵敏度和可靠性提供了方法论上的见解。
英文摘要
AIM. This study examines the PLATO mission sensitivity to small transiting planets (radii between 0.5 and 2.0 R$_\oplus$) using Autoregressive Planet Search (ARPS) methodology based on simulated lightcurves. Methods. Several thousand simulations of PLATO-like lightcurves from magnetically active stars expected from the PLATO Long Observation Phase South 2 (LOPS2) field with injected transiting planets smaller than 2.0 R$_\oplus$ radius are examined. The lightcurves are analyzed with ARPS that uses autoregressive modeling for filtering of nonplanetary signals and the Transit Comb Filter periodogram for planetary transit detection. False alarms of nonexistent periodic signals are reduced by thresholds on two ARPS parameters, peak periodogram power, and transit duration. Results. When applied to PLATO's simulated first three months observations of bright stars (P1 and P2 samples), at least 50% of Earth-size planets are recovered for periods shorter than 40 d. In two years of LOPS2 observation, 25% are recovered for periods less than 240 d. Methodological implications on detrending, periodograms, False Alarms, vetting, and catalog evaluation are discussed. The utility of a positive predicted value heat map after detection and vetting is demonstrated. Conclusions: While the ARPS planet detection procedure is not entirely well-suited for PLATO analysis, this study provides methodological insight into the sensitivity and reliability of small transiting planet detection.
Comments21 pages, 16 figures. Accepted for publication in Astronomy & Astrophysics
