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On Nearly Circular Orbits in Stellar Dynamics 关于恒星动力学中的近似圆形轨道
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2021-03-01 DOI: 10.32023/0001-5237/71.1.4
A. Ninković
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引用次数: 0
Massive Search for Spot- and Facula-Crossing Events in 1598 Exoplanetary Transit Light Curves 大规模搜寻1598年系外行星凌日光曲线中的光斑和光斑穿越事件
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2021-03-01 DOI: 10.32023/0001-5237/71.1.2
R. Baluev, E. Sokov, I. Sokova, V. Shaidulin, A. V. Veselova, V. Aitov, G. Mitiani, A. Valeev, D. Gadelshin, A. Gutaev, G. Beskin, G. Valyavin, K. Antonyuk, K. Barkaoui, M. Gillon, E. Jehin, L. Delrez, S. Gudhmundsson, H. Dale, E. Fern'andez-Laj'us, R. Sisto, M. Bretton, A. Wunsche, V. Hentunen, S. Shadick, Y. Jongen, W. Kang, T. Kim, E. Pakvstien.e, J. Qvam, C. R. Knight, P. Guerra, A. Marchini, F. Salvaggio, R. Papini, P. Evans, M. Salisbury, J. Garlitz, N. Esseiva, Y. Ogmen, P. Bosch-Cabot, A. Selezneva, T. Hinse
We developed a dedicated statistical test for a massive detection of spot- and facula-crossing anomalies in multiple exoplanetary transit light curves, based on the frequentist p-value thresholding. This test was used to augment our algorithmic pipeline for transit light curves analysis. It was applied to 1598 amateur and professional transit observations of 26 targets being monitored in the EXPANSION project. We detected 109 statistically significant candidate events revealing a roughly 2:1 asymmetry in favor of spots-crossings over faculae-crossings. Although some candidate anomalies likely appear non-physical and originate from systematic errors, such asymmetry between negative and positive events should indicate a physical difference between the frequency of star spots and faculae. Detected spot-crossing events also reveal positive correlation between their amplitude and width, possibly due to spot size correlation. However, the frequency of all detectable crossing events appears just about a few per cent, so they cannot explain excessive transit timing noise observed for several targets.
我们开发了一种专门的统计测试,用于基于频率t p值阈值对多个系外行星凌日光曲线中的光斑和光斑交叉异常进行大规模检测。该测试用于增强我们的过境光线曲线分析算法管道。它被应用于1598个业余和专业的凌日观测,这些观测是在扩展项目中监测的26个目标。我们检测到109个具有统计学意义的候选事件,显示出大约2:1的不对称性,有利于斑点交叉而不是光斑交叉。尽管一些候选异常可能表现为非物理异常,并源于系统误差,但正负事件之间的这种不对称性应该表明星点和光斑频率之间存在物理差异。检测到的斑点交叉事件也揭示了它们的幅度和宽度之间的正相关性,这可能是由于斑点大小的相关性。然而,所有可检测到的穿越事件的频率似乎只有百分之几,因此它们无法解释几个目标观测到的过度穿越时间噪声。
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引用次数: 1
On the Critical Mass Ratio for the 3:1 Resonance in Accretion Disks 吸积盘3:1共振的临界质量比
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-12-01 DOI: 10.32023/0001-5237/70.4.5
J. Smak
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引用次数: 0
On the Relation between OH+, OH and CH+ Molecules, Neutral/Molecular Hydrogen and Major 5780/5797 DIBs OH+、OH和CH+分子、中性/分子氢与主要5780/5797 DIBs的关系
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-12-01 DOI: 10.32023/0001-5237/70.4.4
T. Weselak
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引用次数: 1
The Clusters AgeS Experiment (CASE). Variable Stars in the Field of the Globular Cluster NGC 3201 - a Supplement 集群AgeS实验(CASE)。球状星团NGC 3201视野中的变星——补充
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-12-01 DOI: 10.32023/0001-5237/70.4.3
M. Rozyczka, W. Pych, I. Thompson, B. Mazur
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引用次数: 1
High-Velocity Moving Groups in the Solar Neighborhood in Gaia DR2 盖亚DR2太阳邻域的高速运动群
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-06-01 DOI: 10.32023/0001-5237/70.2.4
R. Baluev, V. Shaidulin, A. V. Veselova
We use an improved wavelet analysis technique to reconstruct the $(U,V,W)$ velocity distribution for $sim 250000$ stars from Gaia DR2, residing in the solar neighborhood of $200$~pc. The 2D wavelet transforms for three bivariate distributions $(U,V)$, $(U,W)$, and $(V,W)$ were investigated. Though most of currently known (low-velocity) stellar moving groups are densely overlapped in these diagrams, our analysis allowed to detect and disentangle about twenty statistically significant 3D groups of stars with high velocities. Most of them appear new. We also discuss the issue of correct noise thresholding in the wavelet transform and highlight the importance of using a global rather than local statistic for that. Using of a local significance measure may lead to an overstated statistical confidence for individual patterns due to the effect of multiple testing.
我们使用改进的小波分析技术来重建盖亚DR2的$sim 250000美元恒星的$(U,V,W)$速度分布,这些恒星位于200美元~个的太阳邻域。研究了三个二元分布$(U,V)$、$(U、W)$和$(V,W)$的二维小波变换。尽管目前已知的大多数(低速)恒星运动群在这些图中密集重叠,但我们的分析允许检测和解开大约20个具有统计意义的高速3D恒星群。它们中的大多数看起来都是新的。我们还讨论了小波变换中正确的噪声阈值问题,并强调了使用全局统计而不是局部统计的重要性。由于多重测试的影响,使用局部显著性测量可能会导致个体模式的统计置信度过高。
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引用次数: 2
Orbital Period Analysis of Four Eclipsing Binaries XY Boo, RW Com, MR Del and AK Her 四颗食双星XY Boo、RW-Com、MR Del和AK Her的轨道周期分析
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-03-01 DOI: 10.32023/0001-5237/70.1.3
I. Özavcı, D. Ozuyar, H. V. Şenavcı, M. Yılmaz, E. Bahar, Ö. Baştürk, T. Kılıçoğlu, A. Elmaslı, Ş. Çalışkan, D. D. Izci, O. Yorukoglu, S. Selam
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引用次数: 4
Merger Signatures in Radio Loud and Radio Quiet Quasars 无线电吵闹类星体和无线电安静类星体的合并特征
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-03-01 DOI: 10.32023/0001-5237/70.1.5
D. Garofalo, B. Webster, K. Bishop
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引用次数: 2
Multiple Stellar Encounters on Protoplanetary Disks in Birth Clusters of Stars 诞生星团中原行星盘上的多颗恒星相遇
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-03-01 DOI: 10.32023/0001-5237/70.1.4
J. J. Jiménez-Torres
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引用次数: 0
Photocenter Shift Effect in Double Stars of Gaia DR2 Database Gaia DR2双星数据库的光中心偏移效应
IF 2.2 4区 物理与天体物理 Q2 Physics and Astronomy Pub Date : 2020-01-01 DOI: 10.32023/0001-5237/70.1.2
A. L. Oriona, J. Ling, C. S. Sellero
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引用次数: 2
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Acta Astronomica
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