Searching for Contact Binaries with LAMOST and TESS
Xinjiang Astronomical Observatory, Chinese Academy of Sciences(中国科学院新疆天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文学与空间科学学院);Department of Astronomy, Xiamen University(厦门大学天文学系);College of Physics and Information Engineering, Quanzhou Normal University(泉州师范学院物理与信息工程学院)
Contact binaries (CBs) serve as fundamental laboratories for studying complex stellar interactions, including mass transfer, tidal effects, and angular momentum loss. In this work, we search for CB with high-precision light curves from the Transiting Exoplanet Survey Satellite (TESS) and large radial-velocity variation from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST). We derive a sample of 1,281 CB candidates, among which 266 are newly reported. Our sample with both high-precision photometry and medium-resolution spectra may provide new constraints on the physical scales, luminosity calibration, and population distribution of CBs, offering valuable insights into their evolutionary role within the stellar population.
Rapidly oscillating Ap stars observed with TESS. The LAMOST Ap sample and 49 Cam
Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto(波尔图大学空间与天体物理研究所);Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto(波尔图大学理学院物理与天文学系);South African Astronomical Observatory(南非天文台);School of Physics, Engineering and Technology, University of York(约克大学物理、工程与技术学院);DTU Space, Technical University of Denmark(丹麦技术大学空间中心);Centre for Space Research, North-West University(西北大学太空研究中心);Jeremiah Horrocks Institute, University of Lancashire(兰开夏大学杰里米亚·霍罗克斯研究所);Department of Astronomy, Cornell University(康奈尔大学天文学系);Université Paris-Saclay, Université Paris Cité, CEA, CNRS, AIM(巴黎萨克雷大学、巴黎西岱大学、法国原子能与替代能源委员会、法国国家科学研究中心、天体物理学与信息分子研究所)
Planets Across Space and Time (PAST). VIII : Kinematic Characterization and Identification of Radial Velocity Variables for the LAMOST-Gaia-TESS Stars
School of Astronomy and Space Science, Nanjing University(南京大学天文与空间科学学院);School of Physics and Astronomy, Sun Yat-sen University(中山大学物理学院);Institute for Frontiers in Astronomy and Astrophysics, Beijing Normal University(北京师范大学天文与前沿科学研究院);School of Physics and Astronomy, Beijing Normal University(北京师范大学物理学院);Department of Astronomy, School of Physics, Peking University(北京大学物理学院天文学系);Kavli Institute of Astronomy and Astrophysics, Peking University(北京大学科维理天文与天体物理研究所);National Astronomical Observatories, Chinese Academy of Science(中国科学院国家天文台)
Statistical analysis of asteroseismic indices and stellar parameters of TESS-observed $δ$ Scuti stars
Xinjiang Astronomical Observatory, Chinese Academy of Sciences(中国科学院新疆天文台);School of Astronomy and Space Science, University of Chinese Academy of Sciences(中国科学院大学天文学与空间科学学院);Centre for Fusion, Space and Astrophysics, Department of Physics, University of Warwick(华威大学物理学院聚变、太空与天体物理学中心);Institute of Geophysics, University of Tehran(德黑兰大学地球物理学研究所);Department of Physics, Faculty of Science, University of Qom(库姆大学理学院物理系);Instituto de Astrofísica de Andalucía - CSIC(安达卢西亚天体物理研究所-西班牙国家科研委员会);Departamento de Física Teórica y del Cosmos, Universidad de Granada(格拉纳达大学理论与宇宙物理学系);Ulugh Beg Astronomical Institute, Uzbekistan Academy of Sciences(乌兹别克斯坦科学院乌鲁格别克天文研究所)
The Spectroscopic Binaries from LAMOST Medium-Resolution Survey (MRS). I. Searching for Double-lined Spectroscopic Binaries (SB2s) with Convolutional Neural Network
Searching for Spider-Like Pulsars from TESS Ellipsoidal Lightcurves with X-ray counterparts
School of Physics and Astronomy, Sun Yat-Sen University(中山大学物理学院);CSST Science Center for the Guangdong-Hongkong-Macau Greater Bay Area, Sun Yat-Sen University(中山大学CSST粤港澳大湾区科学中心);Laboratory for Space Research, The University of Hong Kong(香港大学空间研究实验室);Institute of Astronomy Space and Earth Science, P177, CIT Road, Scheme-7M, Kolkata, 700054, West Bengal, India(印度西孟加拉邦加尔各答CIT路P177号 scheme-7M 天体物理学、空间与地球科学研究所)
Stellar Chromospheric Activity Database of Solar-like Stars Based on the LAMOST Low-Resolution Spectroscopic Survey III. Calibrating the Chromospheric Basal Flux and the Connection to Stellar Rotation
Nanxun Innovation Institute, Zhejiang University of Water Resources and Electric Power(浙江水利水电学院南浔创新研究院);National Astronomical Observatories, Chinese Academy of Sciences(中国科学院国家天文台);University of Chinese Academy of Sciences(中国科学院大学);School of Physics and Optoelectronics Engineering, Anhui University(安徽大学物理与光电工程学院)
Searching for flaring star-planet interactions in AU Mic TESS observations
人们认为,围绕磁性活跃恒星运行的行星能够与它们的磁场相互作用,从而调节恒星的活动。这种与行星轨道同相的调制,例如增强的X射线活动、色球斑、无线电发射或耀斑,被认为是磁性恒星-行星相互作用(SPI)最明显的迹象。然而,这种相互作用的大小受到很大的限制,并且相互作用的间歇性对观察者来说是一个挑战。AU Mic是一颗早期的M矮星,也是迄今为止发现的最活跃的恒星宿主。它最里面的伴星,AU Mic b,是一个很有前途的磁SPI观测目标。我们使用由凌日系外行星调查卫星获得的AU Mic的光学光变曲线,使用定制的Anderson-Darling测试来搜索AU Mic b的耀斑SPI的迹象。在大约$50$天的观测中,耀斑的轨道、旋转和会合周期分布与恒星的内在耀斑基本一致。我们发现,最强的偏离($p=0.07,\;n=71$)从本征耀斑与轨道周期的AU Mic b,在高能量的一半,我们的样本($ED>1$ s)。如果它反映了来自AU Mic b的真实SPI信号,则将观察时间延长$2-3$倍将产生$>3σ$检测。因此,对AU Mic的持续监测可能会揭示具有轨道相位的SPI,而旋转调制将由于恒星的强烈差异旋转而模糊。
The massive hot subdwarf binary LAMOST J065816.72+094343.1
University of North Carolina(北卡罗来纳大学);Yunnan Observatories, Chinese Academy of Sciences(中国科学院云南天文台);International Centre of Supernovae (ICESUN), Yunnan Key Laboratory(国际超新星中心(ICESUN),云南省重点实验室);University of Chinese Academy of Sciences(中国科学院大学);Thüringer Landessternwarte Tautenburg(图林根州立陶滕堡天文台);Hamburger Sternwarte, University of Hamburg(汉堡大学汉堡天文台);Texas Tech University(德克萨斯理工大学)
Finding Circumbinary Planets: A Semi-Automated Transit Search of TESS Eclipsing Binaries
University of Warwick(华威大学);Centre for Exoplanets and Habitability, University of Warwick(华威大学系外行星与宜居性中心);School of Physics and Astronomy, University of Birmingham(伯明翰大学物理与天文学学院)
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- I. Search for exoplanets and variable stars in the field of 47 Tuc
TESS任务将调查~ 85%的天空,使我们有机会提取数百万颗恒星的高精度光变曲线,包括星团成员。在这项工作中,我们提出了我们的项目“一个基于PSF的方法TESS高质量的数据星团“(PATHOS),旨在搜索和识别候选系外行星和变星在星团使用我们的创新方法提取高精度的光变曲线的恒星位于拥挤的环境。我们的光变曲线提取技术涉及使用经验点扩散函数(PSF),输入目录和邻域减法。基于PSF的方法使我们能够在拥挤的环境中最大限度地减少稀释效应,并为微弱区域(G>13)的恒星提取高精度测光。对于这个试点项目,我们提取,校正,并分析了16641颗恒星的光变曲线位于一个密集的区域集中在球状星团47图克。我们能够达到TESS星等T~16.5,在6.5小时的时间尺度上测光精度为~ 1%;在明亮的区域,我们能够探测到深度为~34 ppm的凌日。我们搜寻了变星和可能的凌日系外行星。我们的管道探测到一个行星候选者在银河系领域绕着一颗主序星运行。我们分析了47个Tuc的红巨星和食双星的周期光度分布。光变曲线在PATHOS项目下上传到Mikulski Archive for Space Telescopes。
The correlation between photometric variability and radial velocity jitter, based on TESS and HARPS observations
目前和即将到来的高精度测光调查,如TESS,CHEOPS和PLATO将为社区提供数千个新的系外行星候选者。因此,这种相关性的存在是至关重要的,在选择目标与最低的RV抖动的有效RV后续的系外行星候选人。这种类型的研究对于设计优化的观测策略以减轻搜索地球质量系外行星时的RV抖动也至关重要。我们的目标是评估高精度光度变化测量和高精度RV抖动在不同的时间尺度之间的相关性。我们分析了171 G,K和M星与现有的TESS高精度光度时间序列和HARPS精确的RV。我们推导出了样本中恒星的恒星参数,并测量了RV抖动和光度变化。我们还估计了色球Ca II H $\&$ K活动指标$log(R' _{HK})$,$\textit{v sin i}$和恒星自转周期。最后,我们评估如何不同的恒星参数和RV采样子集可以有潜在的相关性的影响。我们发现,作为TESS光度观测和HARPS RV之间的时间间隔的函数的光度变化和RV抖动之间的相关性。随着分析所考虑的观测时间间隔的增加,相关值和显著性变得更小和更弱,以至于可以忽略不计。我们还发现,对于光度变化超过6.5 ppt的恒星,相关性明显更强。我们表明,这样的结果可能是由于现场为主的和院系为主的政权之间的过渡。我们量化了相关性,并更新了色球Ca II H $\&$ K活性指标$log(R' _{HK})$和RV抖动之间的关系。
A PSF-based Approach to TESS High quality data Of Stellar clusters (PATHOS) -- III. Exploring the properties of young associations through their variables, dippers, and candidate exoplanets