Identifying and characterizing ultracool dwarfs ejected from post-encounter disintegrating systems
Abstract
Disintegrating multiple systems have been previously discovered from kinematic studies of the Hipparcos catalogue. They are presumably the result of dynamical encounters taking place in the Galactic disc between single/multiple systems. In this paper, we aim to expand the search for such systems, to study their properties, as well as to characterize possible low-mass ejecta (i.e. brown dwarfs and planets). We have assembled a list of 15 candidate systems using astrometry from the Tycho-Gaia astrometric solution (later upgraded with Gaia DR3), and here we present the discovery and follow-up of five of them. We have obtained DECam imaging for all five systems and by combining near-infrared photometry and proper motion, we searched for ultracool ejected components. We find that the system consisting of TYC 7731-1951-1, TYC 7731-2128 AB, and TYC 7731-1995-1ABC?, contains one very promising ultracool dwarf candidate. Using additional data from the literature, we have found that three out of five disintegrating system candidates are likely to be true disintegrating systems.
Additional Information
© 2023 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). We thank the anonymous referee for their thorough review and for their helpful comments that improved the quality of this manuscript. AKPY would like to thank the Proyecto CONICYT-REDES140024, 'SOCHIAS grant through ALMA/Conicyt Project #31150039" and Ministry of Economy, Development, and Tourism's Millennium Science Initiative through grant IC120009, awarded to The Millennium Institute of Astrophysics, MAS for financial support. MG is supported by the EU Horizon 2020 research and innovation programme under grant agreement No 101004719. JAC-B acknowledges support from FONDECYT Regular N 1220083. This work presents results from the European Space Agency (ESA) space mission Gaia. Gaia data are being processed by the Gaia Data Processing and Analysis Consortium (DPAC). Funding for the DPAC is provided by national institutions, in particular the institutions participating in the Gaia MultiLateral Agreement (MLA). The Gaia mission website is https://www.cosmos.esa.int/gaia. The Gaia archive website is https://archives.esac.esa.int/gaia. This project used data obtained with the Dark Energy Camera (DECam), which was constructed by the Dark Energy Survey (DES) collaboration. Funding for the SDSS and SDSS-II has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, the U.S. Department of Energy, the National Aeronautics and Space Administration, the Japanese Monbukagakusho, the Max Planck Society, and the Higher Education Funding Council for England. The SDSS Web Site is http://www.sdss.org/. This publication makes use of data products from the Wide-field Infrared Survey Explorer, which is a joint project of the University of California, Los Angeles, and the Jet Propulsion Laboratory/California Institute of Technology, funded by the National Aeronautics and Space Administration. This research has made use of the SIMBAD data base, operated at CDS, Strasbourg, France. This work is based in part on data obtained as part of the UKIRT Infrared Deep Sky Survey. Based on observations obtained as part of the VISTA Hemisphere Survey, ESO Progam, 179.A-2010 (PI: McMahon). Data Availability: The DECam observations are publicly available via the NOIRLab archive (https://astroarchive.noirlab.edu/). All survey data used in this paper is publicly available through the relevant survey archives.Attached Files
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Additional details
- Eprint ID
- 121685
- Resolver ID
- CaltechAUTHORS:20230602-251605000.25
- 31150039
- Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)
- IC120009
- Iniciativa Científica Milenio del Ministerio de Economía, Fomento y Turismo
- 101004719
- European Research Council (ERC)
- 1220083
- Fondo Nacional de Desarrollo Científico y Tecnológico (FONDECYT)
- Gaia Multilateral Agreement
- Dark Energy Survey (DES) collaboration
- Alfred P. Sloan Foundation
- Participating Institutions
- NSF
- Department of Energy (DOE)
- NASA
- Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- NASA/JPL/Caltech
- Created
-
2023-06-21Created from EPrint's datestamp field
- Updated
-
2023-06-21Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)