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Discovery of 34 Low-mass Comoving Systems Using NOIRLab Source Catalog DR2

Kiwy, Frank and Faherty, Jacqueline K. and Meisner, Aaron and Schneider, Adam C. and Kirkpatrick, J. Davy and Kuchner, Marc J. and Burgasser, Adam J. and Casewell, Sarah and Kiman, Rocio and Calamari, Emily and Aganze, Christian and Hsu, Chih-Chun and Sainio, Arttu and Thakur, Vinod (2022) Discovery of 34 Low-mass Comoving Systems Using NOIRLab Source Catalog DR2. Astronomical Journal, 164 (1). Art. No. 3. ISSN 0004-6256. doi:10.3847/1538-3881/ac68e7.

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We present the discovery of 34 comoving systems containing an ultracool dwarf found by means of the NOIRLab Source Catalog (NSC) DR2. NSC’s angular resolution of ∼ 1″ allows for the detection of small separation binaries with significant proper motions. We used the catalog’s accurate proper motion measurements to identify the companions by cross-matching a previously compiled list of brown dwarf candidates with NSC DR2. The comoving pairs consist of either a very low-mass star and an ultracool companion, or a white dwarf and an ultracool companion. The estimated spectral types of the primaries are in the K and M dwarf regimes, those of the secondaries in the M, L, and T dwarf regimes. We calculated angular separations between ∼2″ and ∼ 56″, parallactic distances between ∼43 and ∼261 pc, and projected physical separations between ∼169 and ∼8487 au. The lowest measured total proper motion is 97 mas yr⁻¹, with the highest 314 mas yr⁻¹. Tangential velocities range from ∼23 to ∼187 km s⁻¹. We also determined comoving probabilities, estimated mass ratios, and calculated binding energies for each system. We found no indication of possible binarity for any component of the 34 systems in the published literature. The discovered systems can contribute to the further study of the formation and evolution of low-mass systems as well as to the characterization of cool substellar objects.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Kiwy, Frank0000-0001-8662-1622
Faherty, Jacqueline K.0000-0001-6251-0573
Meisner, Aaron0000-0002-1125-7384
Schneider, Adam C.0000-0002-6294-5937
Kirkpatrick, J. Davy0000-0003-4269-260X
Kuchner, Marc J.0000-0002-2387-5489
Burgasser, Adam J.0000-0002-6523-9536
Casewell, Sarah0000-0003-2478-0120
Kiman, Rocio0000-0003-2102-3159
Calamari, Emily0000-0002-2682-0790
Aganze, Christian0000-0003-2094-9128
Hsu, Chih-Chun0000-0002-5370-7494
Sainio, Arttu0000-0003-4864-5484
Additional Information:© 2022. The Author(s). Published by the American Astronomical Society. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Received 2022 January 25; revised 2022 April 19; accepted 2022 April 19; published 2022 June 6. This research was supported by National Science Foundation grant No.s 2007068, 2009136, and 2009177, and J.F. acknowledges support from the Heising-Simons Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Heising-Simons FoundationUNSPECIFIED
Subject Keywords:Binary stars; Multiple stars; Low mass stars; Brown dwarfs; White dwarf stars
Issue or Number:1
Classification Code:Unified Astronomy Thesaurus concepts: Binary stars (154); Multiple stars (1081); Low mass stars (2050); Brown dwarfs (185); White dwarf stars (1799)
Record Number:CaltechAUTHORS:20220606-736227000
Persistent URL:
Official Citation:Frank Kiwy et al 2022 AJ 164 3
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:115041
Deposited By: George Porter
Deposited On:07 Jun 2022 14:35
Last Modified:07 Jun 2022 14:35

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