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arXiv 2211.04574astro-ph.EPastro-ph.SR
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南PLATO场天体物理假阳性探测的总体研究

Population Study of Astrophysical False Positive Detections in the Southern PLATO field

J. C. Bray, U. Kolb, P. Rowden, Robert Farmer, A. Boerner, O. Kozhura

摘要:

对于即将到来的行星凌日和恒星振荡(PLATO)卫星任务,需要大量的目标恒星来产生统计上显著数量的行星凌日。将长期观测相位(LOP)场的中心定位在更靠近银河平面的位置将增加目标恒星的数量,但也会增加混合食双星系统的天体物理误报(FP)。我们利用二进制恒星演化和人口合成(BiSEPS)的代码,创建一个完整的合成恒星和行星人口的建议南部LOP领域(LOPS 0),以及北部LOP领域(LOPNsub)的代表性部分。对于LOPS 0,我们发现小于海王星的行星的FP率总体较低。FP率一般随银河经度(l)变化不大,随银河纬度(|b|)降低而适度增加。LOPS场中心在当前允许区域内的位置不受FP的强烈约束。对LOPNsub的分析表明,在低|b|下,在行星半径的整个范围内,FP的数量显著增加,导致LOPNsub中的FP率百分比大约是在行星半径范围-0.2 < log(R/Rsun)<= 0.4的相应南部磁场段的两倍。然而,在这个半径范围内,LOPS 0中只有百分之几的完全食FP具有周期

英文摘要:

For the upcoming PLAnetary Transits and Oscillation of stars (PLATO) satellite mission, a large number of target stars are required to yield a statistically significant number of planet transits. Locating the centres of the long duration observational phase (LOP) fields closer to the Galactic plane will increase the target star numbers but also the astrophysical false positives (FPs) from blended eclipsing binary systems. We utilise the Binary Stellar Evolution and Population Synthesis (BiSEPS) code, to create a complete synthetic stellar and planetary population for the proposed southern LOP field (LOPS0), as well as for a representative portion of the northern LOP field (LOPNsub). For LOPS0 we find an overall low FP rate for planets smaller than Neptunes. The FP rate generally shows little variation with Galactic longitude (l), and a modest increase with decreasing Galactic latitude (|b|). The location of the LOPS field centre within the current allowed region is not strongly constrained by FPs. Analysis of LOPNsub suggests a markedly increased number of FPs across the full range of planet radii at low |b| resulting in approximately twice the percent FP rate in the LOPNsub compared to the corresponding southern field segment in the planet radius range -0.2 < log(R/Rsun) <= 0.4. However, only a few percent of fully eclipsing FPs in LOPS0 in this radius range have periods

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