Alan P. Boss, Alycia J. Weinberger, Guillem Anglada-Escude, Ian B. Thompson, Gregory Burley, Christoph Birk, Steven H. Pravdo, Stuart B. Shaklan, George D. Gate… 展开作者
Alan P. Boss, Alycia J. Weinberger, Guillem Anglada-Escude, Ian B. Thompson, Gregory Burley, Christoph Birk, Steven H. Pravdo, Stuart B. Shaklan, George D. Gatewood, Steven R. Majewski, Richard J. Patterson
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48 pages, 9 figures. in press, Publ. Astron. Soc. Pacific
We are undertaking an astrometric search for gas giant planets and brown dwarfs orbiting nearby low mass dwarf stars with the 2.5-m du Pont telescope at the Las Campanas Observatory in Chile. We have built two specialized astrometric cameras, the Carnegie Astrometric Planet Search Cameras (CAPSCam-S and CAPSCam-N), using two Teledyne Hawaii-2RG HyViSI arrays, with the cameras' design having been optimized for high accuracy astrometry of M dwarf stars. We describe two independent CAPSCam data reduction approaches and present a detailed analysis of the observations to date of one of our target stars, NLTT 48256. Observations of NLTT 48256 taken since July 2007 with CAPSCam-S imply that astrometric accuracies of around 0.3 milliarcsec per hour are achievable, sufficient to detect a Jupiter-mass companion orbiting 1 AU from a late M dwarf 10 pc away with a signal-to-noise ratio of about 4. We plan to follow about 100 nearby (primarily within about 10 pc) low mass stars, principally late M, L, and T dwarfs, for 10 years or more, in order to detect very low mass companions with orbital periods long enough to permit the existence of habitable, Earth-like planets on shorter-period orbits. These stars are generally too faint and red to be included in ground-based Doppler planet surveys, which are often optimized for FGK dwarfs. The smaller masses of late M dwarfs also yield correspondingly larger astrometric signals for a given mass planet. Our search will help to determine whether gas giant planets form primarily by core accretion or by disk instability around late M dwarf stars.
The Astrometric Resoeccentric Degeneracy: Eccentric Single Planets Mimic 2:1 Resonant Planet Pairs in Astrometry
Center for Computational Astrophysics, Flatiron Institute（计算天体物理学中心，平顿研究所）；Kavli Institute for Astrophysics and Space Research, Massachusetts Institute of Technology（卡弗里天体物理与空间研究所，麻省理工学院）；Department of Physics and Astronomy, Stony Brook University（物理与天文系，石溪大学）；School of Physics & Astronomy, Monash University（物理与天文学院，蒙纳士大学）
Ultra-Precise Astrometric Search for Exoplanets with SKA-VLBI
International Centre for Radio Astronomy Research (ICRAR), University of Western Australia（西澳大利亚大学国际射电天文研究中心）；Joint Institute for VLBI ERIC (JIVE)（甚长基线干涉测量欧洲研究基础设施合作组织）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）
Astrometric Methods for Detecting Exomoons Orbiting Imaged Exoplanets: Prospects for Detecting Moons Orbiting a Giant Planet in $α$ Centauri A's Habitable Zone
提出模拟框架研究通过天体测量信号探测系外卫星，发现专用空间望远镜和39m地基望远镜可在五年任务中探测到环绕 $α$ 半人马座 A 假想巨行星的地球大小卫星。
Astrometric exomoon detection by means of optical interferometry
European Southern Observatory（欧洲南方天文台）；LIRA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Université de Paris（巴黎天文台 LIRA 实验室，巴黎文理研究大学，法国国家科学研究中心，索邦大学，巴黎大学）；Institute of Astronomy, University of Cambridge（剑桥大学天文学研究所）；Department of Physics & Astronomy, Johns Hopkins University（约翰斯·霍普金斯大学物理与天文学系）；Space Telescope Science Institute（太空望远镜科学研究所）；Max Planck Institute for extraterrestrial Physics（马克斯·普朗克地外物理学研究所）；Max Planck Institute for Astronomy（马克斯·普朗克天文学研究所）
High precision astrometry mission for the detection and characterization of nearby habitable planetary systems with the Nearby Earth Astrometric Telescope (NEAT)
Finding Habitable Exoplanets with Binary Relative Astrometry: Planet Detection and Characterization with the Microarcsecond Astrometric Retrieval Algorithm (MARA)
New Mexico State University（新墨西哥州立大学）；California Institute of Technology（加州理工学院）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；NASA Ames Research Center（美国国家航空航天局艾姆斯研究中心）；University of Arizona（亚利桑那大学）
Gaia DR3 astrometric orbit determination with Markov Chain Monte Carlo and Genetic Algorithms. Systems with stellar, substellar, and planetary mass companions
Astrometric positions for 18 irregular satellites of giant planets from 23 years of observations
巨行星的不规则卫星被认为是在太阳系演化过程中被捕获的。了解它们的物理参数，如大小、密度和密度，对于限制它们来自何处以及如何捕获它们非常重要。获得这些参数的最佳方法是由航天器进行现场观测或由天体进行掩星观测。这两种技术都要求轨道是已知的。我们的目标是获得良好的天体测量位置的不规则卫星，以改善他们的轨道和星历。我们从三个数据库中识别并减少了几颗不规则卫星的观测结果，这些数据库包含1992年至2014年在三个站点（Observatório do Pico dos Dias，Observatoire de Haute-Provence和European Southern Observatory - La Silla）获得的8000多张图像。我们使用PRAIA（Platform for Reduction of Astronomical Images Automatically）软件对CCD图像进行了天体测量归算。UCAC 4星表代表国际天体参考系。帧中卫星的识别是通过SPICE/NAIF内核确定的星历完成的。为了克服信息（坐标、日期）缺失或不完整的问题，采取了一些程序，主要是针对较旧的图像。我们设法获得了18颗不规则卫星的6000多个位置：木星的12个，土星的4个，天王星的1个（Sycorax）和海王星的1个（Nereid）。对于某些卫星，获得的位置数超过早期轨道数值积分中使用的位置数的5…
A Scalable Path to Astrometric Exomoon Discoveries with the Nautilus Space Observatory
University of Arizona（亚利桑那大学）；Seoul National University（首尔国立大学）；Massachusetts Institute of Technology（麻省理工学院）；University of Maryland, College Park（马里兰大学帕克分校）；NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；Center for Research and Exploration in Space Science and Technology II (CRESST II)（空间科学与技术研究探索中心二期）；NASA Ames Research Center（美国宇航局艾姆斯研究中心）；Max Planck Institute for Solar System Research（马克斯·普朗克太阳系研究所）；University of Graz（格拉茨大学）；Space Telescope Science Institute（太空望远镜科学研究所）
Closeby Habitable Exoplanet Survey (CHES). IV. Synergy between astrometry and direct imaging missions of the Habitable World Observatory for detecting Earth-like planets
Masses of Potentially Habitable Planets Characterized by the Habitable Worlds Observatory
The Ohio State University（俄亥俄州立大学）；NASA Ames Research Center（美国宇航局艾姆斯研究中心）；University of Arizona（亚利桑那大学）；California Institute of Technology（加州理工学院）；NASA Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）
Multi-band Spectral and Astrometric Characterization of the HIP 99770 b Planet with SCExAO/CHARIS and Gaia
University of Texas-San Antonio（德克萨斯大学圣安东尼奥分校）；University of California-Santa Cruz（加州大学圣克鲁兹分校）；Astrobiology Center of NINS（日本自然科学研究机构天体生物学中心）；National Astronomical Observatory of Japan（日本国立天文台）；University of Notre Dame（圣母大学）；University of Michigan（密歇根大学）；NASA-Goddard Space Flight Center（美国宇航局戈达德太空飞行中心）；University of California, Santa Barbara（加州大学圣巴巴拉分校）；The University of Tokyo（东京大学）
SCExAO/CHARIS and Gaia Direct Imaging and Astrometric Discovery of a Superjovian Planet 3--4 lambda/D from the Accelerating Star HIP 54515
University of Texas at San Antonio（圣安东尼奥德克萨斯大学）；University of Michigan（密歇根大学）；University of California-Santa Cruz（加州大学圣克鲁兹分校）；University of Hawai'i（夏威夷大学）；Astrobiology Center, NINS（国立天文台天体生物学中心（NINS））；National Astronomical Observatory of Japan（日本国立天文台）；University of Notre Dame（圣母大学）；The University of Tokyo（东京大学）；Johns Hopkins University（约翰斯·霍普金斯大学）；Space Telescope Science Institute（太空望远镜科学研究所）；NASA-Goddard Space Flight Center（美国国家航空航天局戈达德太空飞行中心）；Stockholm University（斯德哥尔摩大学）；Princeton University（普林斯顿大学）；National Research Council, Herzberg Astronomy and Astrophysics（加拿大国家研究委员会赫茨伯格天文学与天体物理学研究所）；Jet Propulsion Laboratory, California Institute of Technology（加州理工学院喷气推进实验室）；The Graduate University for Advanced Studies, SOKENDAI（综合研究大学院大学（SOKENDAI））；Hokkaido University（北海道大学）；New Mexico State University（新墨西哥州立大学）；Stony Brook University（石溪大学）；University of Hawai’i at Manoa（夏威夷大学马诺阿分校）；California State University Northridge（北岭加州州立大学）
Using Astrometry to Break Degeneracies in Stellar Surface Mapping
Michigan Institute for Data Science, University of Michigan（密歇根大学数据科学研究所）；Department of Astronomy, University of Michigan（密歇根大学天文学系）；Department of Electrical Engineering and Computer Science, University of Michigan（密歇根大学电气与计算机工程系）
Astrometric view of companions in the inner dust cavities of protoplanetary disks
European Southern Observatory（欧洲南方天文台）；School of Physics and Astronomy, University of Leeds（利兹大学物理与天文学学院）；Dipartimento di Fisica, Università degli Studi di Milano（米兰大学物理系）；Institute of Astronomy, University of Cambridge（剑桥大学天文学研究所）；Max Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理学研究所）；Max-Planck-Institut für Astronomie (MPIA)（马克斯·普朗克天文学研究所）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）；INAF - Istituto di Radioastronomia（意大利国家天体物理研究所射电天文研究所）；Centro de Astrobiología (CAB), CSIC-INTA（西班牙国家研究委员会-国家航空航天技术研究所天体生物学中心）；Astronomy Unit, School of Physics and Astronomy, Queen Mary University of London（伦敦大学玛丽女王学院物理与天文学学院天文学单元）
