VLT/SPHERE astrometric confirmation and orbital analysis of the brown dwarf companion HR 2562 B
A. -L. Maire, L. Rodet, C. Lazzoni, A. Boccaletti, W. Brandner, R. Galicher, F. Cantalloube, D. Mesa, H. Klahr, H. Beust, G. Chauvin, S. Desidera, M. Janson, M.… 展开作者
A. -L. Maire, L. Rodet, C. Lazzoni, A. Boccaletti, W. Brandner, R. Galicher, F. Cantalloube, D. Mesa, H. Klahr, H. Beust, G. Chauvin, S. Desidera, M. Janson, M. Keppler, J. Olofsson, J. -C. Augereau, S. Daemgen, T. Henning, P. Thébault, M. Bonnefoy, M. Feldt, R. Gratton, A. -M. Lagrange, M. Langlois, M. R. Meyer, A. Vigan, V. D'Orazi, J. Hagelberg, H. Le Coroller, R. Ligi, D. Rouan, M. Samland, T. Schmidt, S. Udry, A. Zurlo, L. Abe, M. Carle, A. Delboulbé, P. Feautrier, Y. Magnard, D. Maurel, T. Moulin, A. Pavlov, D. Perret, C. Petit, J. R. Ramos, F. Rigal, A. Roux, L. Weber
备注：
Accepted for publication in A&A. 14 pages, 14 figures, 3 tables. Updated to match published paper. Bug in the computation of the distributions of times at periastron passages corrected, minor effects on other orbital parameters
Context. A low-mass brown dwarf has been recently imaged around HR 2562 (HD 50571), a star hosting a debris disk resolved in the far infrared. Interestingly, the companion location is compatible with an orbit coplanar with the disk and interior to the debris belt. This feature makes the system a valuable laboratory to analyze the formation of substellar companions in a circumstellar disk and potential disk-companion dynamical interactions. Aims. We aim to further characterize the orbital motion of HR 2562 B and its interactions with the host star debris disk. Methods. We performed a monitoring of the system over ~10 months in 2016 and 2017 with the VLT/SPHERE exoplanet imager. Results. We confirm that the companion is comoving with the star and detect for the first time an orbital motion at high significance, with a current orbital motion projected in the plane of the sky of 25 mas (~0.85 au) per year. No orbital curvature is seen in the measurements. An orbital fit of the SPHERE and literature astrometry of the companion without priors on the orbital plane clearly indicates that its orbit is (quasi-)coplanar with the disk. To further constrain the other orbital parameters, we used empirical laws for a companion chaotic zone validated by N-body simulations to test the orbital solutions that are compatible with the estimated disk cavity size. Non-zero eccentricities (>0.15) are allowed for orbital periods shorter than 100 yr, while only moderate eccentricities up to ~0.3 for orbital periods longer than 200 yr are compatible with the disk observations. A comparison of synthetic Herschel images to the real data does not allow us to constrain the upper eccentricity of the companion.
VIBES: VIsual Binary Exoplanet survey with SPHERE Upper limits on wide S-planet and S-BD frequencies, triple system discovery, and astrometric confirmation of 20 stellar binaries and three triple systems
Direct spectroscopic confirmation of the young embedded proto-planet WISPIT 2c
University of Galway（戈尔韦大学）；Ryan Institute, University of Galway（戈尔韦大学瑞安研究所）；Leiden Observatory, Leiden University（莱顿大学莱顿天文台）；Max Planck Institute for Extraterrestrial Physics（马克斯·普朗克地外物理研究所）；Center for Astronomical Adaptive Optics, Department of Astronomy, University of Arizona（亚利桑那大学天文学系天文自适应光学中心）；Department of Physics, Technical University of Munich（慕尼黑工业大学物理系）；Faculdade de Engenharia, Universidade do Porto（波尔图大学工程学院）；CENTRA – Centro de Astrofísica e Gravitação, IST（IST CENTRA——天体物理学与引力中心）
Exomoon search with VLTI/GRAVITY around the substellar companion HD 206893 B
Observatoire de Paris, Université PSL, Sorbonne Université, Université Paris Cité, CY Cergy Paris Université, CNRS（巴黎天文台，PSL大学，索邦大学，巴黎西岱大学，塞吉-蓬图瓦兹大学，法国国家科学研究中心）；Center for Interdisciplinary Exploration and Research in Astrophysics (CIERA) and Department of Physics and Astronomy, Northwestern University（西北大学天体物理学跨学科探索与研究中心及物理与天文学系）；European Southern Observatory（欧洲南方天文台）；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）
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）
Search for Nearby Earth Analogs. II. detection of five new planets, eight planet candidates, and confirmation of three planets around nine nearby M dwarfs
The GAPS programme at TNG LXXV. Validating and confirming Gaia substellar astrometric candidates with HARPS-N
INAF – Osservatorio Astrofisico di Torino（意大利国家天体物理研究所都灵天文台）；Department of Physics, University of Rome Tor Vergata（罗马第二大学物理系）；INAF – Osservatorio Astronomico di Palermo（意大利国家天体物理研究所巴勒莫天文台）；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 Trieste（意大利国家天体物理研究所里雅斯特天文台）；Dipartimento di Fisica, Università degli Studi di Torino（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）
