期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 499, 期 4, 页码 5302-5317出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/staa3118
关键词
binaries: general; brown dwarfs; stars: low-mass
资金
- US Department of Energy
- US National Science Foundation
- Ministry of Science and Education of Spain
- Science and Technology Facilities Council of the United Kingdom
- Higher Education Funding Council for England
- National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign
- Center for Cosmology and Astro-Particle Physics at the Ohio StateUniversity
- Mitchell Institute for Fundamental Physics and Astronomy at Texas AM University
- Financiadora de Estudos e Projetos
- Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico
- Deutsche Forschungsgemeinschaft
- University of California at Santa Cruz
- University of Cambridge, Centro de Investigaciones Energeticas, Medioambientales y Tecnol ogicas-Madrid
- DES-Brazil Consortium
- University of Edinburgh
- Eidgenossische Technische Hochschule (ETH) Zurich
- Ludwig-Maximilians Universitat Munchen
- University of Nottingham
- University of Portsmouth
- OzDES Membership Consortium
- NSF's National Optical-Infrared Astronomy Research Laboratory
- National Science Foundation [AST-1138766, AST-1536171]
- MINECO [AYA2015-71825, ESP2015-66861, FPA2015-68048, SEV-2016-0588, SEV-2016-0597, MDM-2015-0509]
- ERDF
- European Union - CERCA program of the Generalitat de Catalunya
- European Research Council under the European Union
- ERC [240672, 291329, 306478]
- Australian Research Council Centre of Excellence for All-skyAstrophysics (CAASTRO) [CE110001020]
- Brazilian Instituto Nacional de Ciencia e Tecnologia (INCT) e-Universe (CNPq) [465376/2014-2, DE-AC02-07CH11359]
- US Department of Energy, Office of Science, Office of High Energy Physics - National Aeronautics and Space Administration
- PAPDRJ CAPES/FAPERJ Fellowship
- STFC [ST/S000550/1, ST/T003081/1, ST/R000433/1] Funding Source: UKRI
We present the discovery of 255 binary and 6 multiple system candidates with wide (> 5 arcsec) separation composed by ultracool dwarfs (UCDs) companions to stars, plus nine double ultracool dwarf systems. These systems were selected based on common distance criteria. About 90 per cent of the total sample has proper motions available and 73 per cent of the systems also satisfy a common proper motion criterion. The sample of ultracool candidates was taken from the Dark Energy Survey (DES) and the candidate stellar primaries are from Gaia DR2 and DES data. We compute chance alignment probabilities in order to assess the physical nature of each pair. We find that 174 candidate pairs with Gaia DR2 primaries and 81 pairs with a DES star as a primary have chance alignment probabilities < 5 per cent. Only nine candidate systems composed of two UCDs were identified. The sample of candidate multiple systems is made up of five triple systems and one quadruple system. The majority of the UCDs found in binaries and multiples are of early L type and the typical wide binary fraction over the L spectral types is 2-4 per cent. Our sample of candidate wide binaries with UCDs as secondaries constitutes a substantial increase over the known number of such systems, which are very useful to constrain the formation and evolution of UCDs.
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