Distributions of wide binary stars in theory and in Gaia data: I. Generalized Ambartsumian (1937) approach and the family of power-law distributions of eccentricity
The orbital parameter space of wide, weakly bound binary stars has been shaped by the still poorly known circumstances of their formation, as well as by subsequent dynamical evolution in parent clusters and in the field. The advance of the Gaia mission astrometry takes statistical studies of wide stellar systems to an unprecedented level of precision and scope. On the theoretical side of the problem, the old approach proposed by Jeans and developed by Ambartsumian is revisited here. It is shown how certain simplifying assumptions about the phase density of binary systems in the framework of general copula distributions can lead to a family of analytical representations for the marginal distribution of orbital eccentricity, including accommodating and flexible power-law models. We further demonstrate the application of these models in forward Monte Carlo simulations of the measured motion angles between the relative velocity and separation vectors on the example of 170K listed Gaia binary systems, providing inference in the intrinsic distribution of orbital eccentricity.
Planet Occurrence Rate Correlated to Stellar Dynamical History: Evidence from Kepler and Gaia
恒星的动力学历史对行星的形成和演化有着重要的影响。为了从观测中探索动力学历史对行星形成和演化的影响,我们假设经历了显著不同动力学历史的恒星往往具有不同的相对速度。利用精确的Gaia-Kepler星表,我们选取了单个主序星,并根据它们的相对速度将它们分为高V、中V和低V三组。在考虑了开普勒观测数据的已知偏差后,采用先验和后验校正方法,使恒星性质对行星出现率的影响最小化,发现高V星的超地球和次海王星出现率(1--4 R $_{\rm \oplus}$,P<100天)比低V星低,而次地球出现率(0.5--1 R $_{ \oplus}$,P<30天)比低V星高。此外,高V恒星有较低的热木星大小的行星的出现率(4- 20 R $_{\oplus}$,P<10天)和略高的热或冷木星大小的行星的出现率(4- 20 R $_{\oplus}$,10<P<400天)。通过对多重数和偏心率的研究,发现高V行星宿主更倾向于多行星系统的比例更高、平均偏心率更低,这与Kepler行星系的偏心率-多重数二分法相一致。所有这些统计结果支持这样的假设,即相对速度大的高V星可能经历较少的引力事件,而低V星可能受到恒星成团的显著影响。
Dynamical formation of dormant black holes: Predictions for Gaia DR4
Universität Heidelberg(海德堡大学);University of Padova(帕多瓦大学);Universitat Politècnica de Catalunya(加泰罗尼亚理工大学);Universitat de Barcelona (UB)(巴塞罗那大学);INAF - Osservatorio Astronomico di Padova(意大利国家天体物理研究所帕多瓦天文台)
The GAPS programme at TNG LXX. HD 128717 B/Gaia-6 B: a long-period eccentric low-mass brown dwarf from astrometry and radial velocities
INAF - Osservatorio Astronomico di Padova(意大利国家天体物理研究所帕多瓦天文台);INAF - Osservatorio Astronomico di Roma(意大利国家天体物理研究所罗马天文台);INAF - Osservatorio Astrofisico di Catania(意大利国家天体物理研究所卡塔尼亚天文台);INAF - Osservatorio Astronomico di Palermo(意大利国家天体物理研究所巴勒莫天文台);Department of Astronomy and Steward Observatory, The University of Arizona(亚利桑那大学天文学系和斯图尔德天文台);Fundación Galileo Galilei - INAF(伽利略基金会-意大利国家天体物理研究所);School of Earth and Space Exploration, Arizona State University(亚利桑那州立大学地球与空间探索学院);Department of Physics, University of Turin(都灵大学物理系);INAF - Osservatorio Astronomico di Brera(意大利国家天体物理研究所布雷拉天文台)
The role of accretion efficiency, natal kicks, and angular momentum transport in the formation of the Gaia black holes
Universität Heidelberg(海德堡大学);University of Padova(帕多瓦大学);INAF - Osservatorio Astronomico di Padova(意大利国家天体物理研究所帕多瓦天文台);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Universitat de Barcelona(巴塞罗那大学)
An Intermediate-orbit Brown Dwarf Confirmed with Astrometry+Radial Velocity Joint Analysis, and the Eccentricity Distribution of Brown Dwarfs Across Different Locations
Westlake University(西湖大学);Instituto de Astrofísica de Canarias (IAC)(加那利天体物理研究所);Universidad de La Laguna (ULL)(拉帕鲁纳大学);Tsung-Dao Lee Institute & School of Physics and Astronomy, Shanghai Jiao Tong University(上海交通大学物理与天文学院、李政道研究所)
Common envelope evolution and triple dynamics as potential pathways to form the inner white dwarf + brown dwarf binary of the triple star system Gaia 0007-1605
The SB9 catalogue: status, comparison with non-single stars from Gaia DR3 and evolution to SBX
Université Libre de Bruxelles(布鲁塞尔自由大学);Royal Observatory of Belgium(比利时皇家天文台);Observatoire astronomique de Strasbourg, CDS, Université de Strasbourg, CNRS, UMR 7550(斯特拉斯堡天文台,CDS,斯特拉斯堡大学,法国国家科学研究中心,UMR 7550);Cerro Tololo Inter-American Observatory, NSF’s NOIRLab(塞罗托洛泛美天文台,NSF的NOIRLab);Faculty of Mathematics & Physics, University of Ljubljana(卢布尔雅那大学数学与物理学院);INAF - Osservatorio Astrofisico di Arcetri(意大利国家天体物理研究所-阿切尔蒂天文台)
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)
Gaia Barium Dwarfs and Their Ostensibly Ordinary Counterparts
Weizmann Institute of Science(魏茨曼科学研究所);Max-Planck-Institut für Astronomie(马克斯·普朗克天文学研究所);Anton Pannekoek Institute for Astronomy, University of Amsterdam(阿姆斯特丹大学安东·潘内克天文研究所)
The 24 Aqr triple system: A closer look at its unique high-eccentricity hierarchical architecture
Al-Hussein Bin Talal University(侯赛因·本·塔拉勒大学);University of Sharjah(沙迦大学);Sharjah Academy for Astronomy, Space Sciences and Technology(沙迦天文学、空间科学与技术学院);Al al-Bayt University(阿尔拜特大学);Southern Connecticut State University(南康涅狄格州立大学);New York University Abu Dhabi(纽约大学阿布扎比分校)
Modelling the Future of Gaia Neutron Star-Main Sequence Binaries: From Eccentric Orbits to Millisecond Pulsar-White Dwarfs
Northwestern University(西北大学);NSF-Simons AI Institute for the Sky (SkAI)(NSF-Simons 天空人工智能研究所);University of California, San Diego(加州大学圣地亚哥分校);California Institute of Technology(加州理工学院)