The Berlin Exoplanet Search Telescope II. Catalog of Variable Stars. I. Characterization of Three Southern Target Fields
T. Fruth, J. Cabrera, R. Chini, Sz. Csizmadia, C. Dreyer, P. Eigmüller, A. Erikson, P. Kabath, S. Kirste, R. Lemke, M. Murphy, T. Pasternacki, H. Rauer, R. Titz-Weider
A photometric survey of three Southern target fields with BEST II yielded the detection of 2,406 previously unknown variable stars and an additional 617 stars with suspected variability. This study presents a catalog including their coordinates, magnitudes, light curves, ephemerides, amplitudes, and type of variability. In addition, the variability of 17 known objects is confirmed, thus validating the results. The catalog contains a number of known and new variables that are of interest for further astrophysical investigations, in order to, e.g., search for additional bodies in eclipsing binary systems, or to test stellar interior models.
Altogether, 209,070 stars were monitored with BEST II during a total of 128 nights in 2009/2010. The overall variability fraction of 1.2-1.5% in these target fields is well comparable to similar ground-based photometric surveys. Within the main magnitude range of $R\in\left[11,17\right]$, we identify 0.67(3)% of all stars to be eclipsing binaries, which indicates a completeness of about one third for this particular type in comparison to space surveys.
Astrometric planet search around southern ultracool dwarfs: V. Discovery of the exoplanet candidate PALTA-1 b
European Space Agency（欧洲空间局）；Main Astronomical Observatory, National Academy of Sciences of the Ukraine（乌克兰国家科学院主天文台）；Instituto de Astrofísica de Canarias（加那利群岛天体物理研究所）；Université de Genève（日内瓦大学）
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- II. Search for exoplanets in open clusters of the southern ecliptic hemisphere and their frequency
DUET: Design of a simultaneous InGaAs--CCD split-beam imager for ultra-cool dwarf exoplanet transit survey
ETH Zürich（苏黎世联邦理工学院）；Cavendish Laboratory, University of Cambridge（剑桥大学卡文迪许实验室）；Astrobiology Research Unit, Université de Liège（列日大学天体生物学研究单元）；School of Physics and Astronomy, University of Birmingham（伯明翰大学物理与天文学院）
Temperature and Distance Dependence of Tidal Circularization in Close Binaries: A Catalog of Eclipsing Binaries in the Southern Hemisphere Observed by the TESS Satellite
IZ Tel and UW Vir: Southern oscillating eclipsing Algol systems with active mass transfer
Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens（雅典国家天文台天文学、天体物理学、空间应用与遥感研究所）；The University of Queensland（昆士兰大学）；Astronomical Association of Queensland（昆士兰天文协会）；Çanakkale Onsekiz Mart University（恰纳卡莱18马月大学）
The HARPS search for southern extra-solar planets. XXXI. Magnetic activity cycles in solar-type stars: statistics and impact on precise radial velocities
上下文通过径向速度测量寻找太阳系外行星依赖于恒星光球的稳定性。目标。我们的目标是表征磁活动周期的统计特性，并研究它们对光谱测量的影响，如径向速度，线平分线和线形。方法.我们使用的数据从HARPS高精度行星搜索样本包括304 FGK恒星超过7年。我们获得高精度的Ca II H & K色球活动测量，并将其转换为R'HK指数使用更新的校准考虑到恒星金属丰度。我们研究R'HK变异作为时间的函数，并寻找可能的相关性与径向速度和线形参数。结果我们根据Ca II H & K变化的幅度和时间尺度对恒星进行分类，并尽可能确定活动周期。我们发现，在太阳附近，39 +/-8%的老太阳型恒星没有任何活动周期（或者只有非常弱的活动周期），而61 +/-8%的恒星有活动周期。非循环星几乎只在G矮星中发现，平均活动水平log R'HK <-4.95。磁周期振幅一般随活动水平的降低而降低。相当一部分恒星的径向速度和线形参数与活动周期相关，表现出很小的变化。径向速度对磁循环的敏感性随着温度的升高而增加，而晚K矮星几乎不敏感。结论.活动周期确实会引起长周期、低幅度的径向速度变化，其水平高达~25 m/s。因此，在寻找长周期系外行星时必须谨慎。然而，这些影响可以被校正到高精度的径向速度数据，同时测量钙II H & K通量和线形参数的去趋势。（节录）
On-sky performance and prospects of near-infrared CMOS detectors in exoplanet detection: first year of SPIRIT
Cavendish Laboratory（卡文迪许实验室）；ETH Zurich（苏黎世联邦理工学院）；Instituto de Astrofísica de Canarias (IAC)（加那利群岛天体物理研究所）；Astrobiology Research Unit, Université de Liège（列日大学天体生物学研究单元）；Department of Earth, Atmospheric and Planetary Science, Massachusetts Institute of Technology（麻省理工学院地球、大气与行星科学系）；School of Physics & Astronomy, University of Birmingham（伯明翰大学物理与天文学院）
The HARPS search for southern extra-solar planets. XLVII. Five Jupiter-mass planets in long-period orbits, one highly irradiated Neptune, one brown dwarf, and five stellar binaries
The PLATO Science Calibration and Validation Plan: Targets for the First Long-pointing Field
Universität Innsbruck（因斯布鲁克大学）；KU Leuven（鲁汶大学）；Deutsches Zentrum für Luft- und Raumfahrt（德国航空航天中心）；Université Côte d’Azur（蔚蓝海岸大学）；Observatoire de la Côte d’Azur（蔚蓝海岸天文台）；CNRS（法国国家科学研究中心）；Laboratoire Lagrange（拉格朗日实验室）；Max Planck Institute for Solar System Research（马克斯·普朗克太阳系研究所）；Uppsala University（乌普萨拉大学）；INAF-Osservatorio Astrofisico di Catania（意大利国家天体物理研究所卡塔尼亚天文台）；Istituto Nazionale di Astrofisica (INAF)（意大利国家天体物理研究所）；Keele University（基尔大学）
