AI 中文总结
该研究测算PLATO M型矮星凌星搜索pipeline的完整性与虚警率，预测LOPS2天区宜居带类地行星的探测概率，为PLATO任务的宜居带行星探测成果提供发射前评估。
AI 中文摘要
PLATO任务将对首个长期指向天区LOPS2（长期观测阶段南天区）开展至少两年的观测，使其M型矮星样本的宜居带（HZ）进入凌星搜索的探测范围。研究在TESS M型矮星上验证过的pipeline的完整性与虚警率，通过模拟的PLATO测光数据进行测算，并转换为LOPS2天区M型矮星的候选天体级别预测结果。模拟的PLATO光变曲线（基线长度717天；样本暗弱部分的三个恒星像元）被完整处理为两个分支：一个不使用发射前的仪器系统误差模型，另一个使用该模型：前者包含930个样本（465次重复、525颗注入行星、465个仅含噪声的孪生天体），后者包含790个样本。注入行星用于测算不同信噪比（S/N）下的完整性，其中宜居带的长周期区域单独测算；仅含噪声的孪生天体用于测算基于红噪感知统计量S/N_pink下限的虚警率。所有周期的完整性在S/N=7.7±0.15时达到50%，长周期区域则为8.6±0.3。当S/N_pink下限从6提升至8时，虚警率从79±2%降至0.6%；采用的下限为7.5时，虚警率为6±1%，对应完整性为54±2%。在该天区中，50颗已知凌星感兴趣天体（19颗已确认行星、31颗候选天体）将全部被恢复；一颗半径为1.0（1.5）倍地球半径的凌星宜居带行星将以约40%（65%）的概率被恢复为候选天体，这意味着在16929颗场M型矮星中，预计将发现约4颗宜居带类地行星和7颗超级地球。使用系统误差模型的分支将S/N的50%点偏移了+0.54（+0.27/-0.22），该影响仅局限于过渡区域，而对构成宜居带的长周期注入天体而言，该下限仍保持稳健且影响可忽略。PLATO M型矮星周围的宜居带类地行星处于已实测的探测前沿，其完整性与可靠性均可在发射前测算，二者共同决定探测成果。
英文摘要
The PLATO mission will observe its first long-pointing field, LOPS2 (Long-duration Observation Phase, South field), for at least two years, bringing the habitable zones (HZ) of its M-dwarf sample within reach of a transit search. The completeness and false-alarm rate of a pipeline validated on TESS M dwarfs are measured on simulated PLATO photometry and converted into a candidate-level forecast for the LOPS2 M dwarfs. Simulated PLATO light curves (717 d baseline; three stellar cells of the faint half of the sample) were processed end to end in two arms, without and with a pre-launch model of the instrument systematics: 930 in the first (465 realisations, 525 injected planets, 465 noise-only twins) and 790 in the second. Injected planets measure completeness against the expected signal-to-noise ratio (S/N), separately for the long-period regime of the HZ; noise-only twins measure the false-alarm rate against the floor on the red-noise-aware statistic S/N_pink. Completeness reaches 50% at S/N = 7.7 +/- 0.15 over all periods and 8.6 +/- 0.3 in the long-period regime. The false-alarm rate falls from 79 +/- 2% to 0.6% as the S/N_pink floor rises from 6 to 8, and 6 +/- 1% at the adopted floor 7.5 (completeness 54 +/- 2%). In the field, the 50 known transiting objects of interest (19 confirmed planets, 31 candidates) would all be recovered; a transiting HZ planet of 1.0 (1.5) Earth radii would be recovered as a candidate with ~40% (65%) probability, giving about 4 HZ Earths and 7 super-Earths over 16 929 field M dwarfs. The systematics arm shifts the 50% point by +0.54 (+0.27/-0.22) in S/N, a penalty localised on the transition, leaving the floor robust and negligible on the long-period injections that feed the HZ. Habitable-zone Earths around the PLATO M dwarfs sit at the measured detection frontier, where completeness and reliability, both measurable before launch, decide the yield.
Comments6 pages, 4 figures, 1 table
