Discovery of 34 Low-mass Comoving Systems Using NOIRLab Source Catalog DR2
Abstract
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.
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.Attached Files
Published - Kiwy_2022_AJ_164_3.pdf
Accepted Version - 2204.09739.pdf
Files
2204.09739.pdf
Additional details
Identifiers
- Eprint ID
- 115041
- Resolver ID
- CaltechAUTHORS:20220606-736227000
Related works
- Describes
- https://arxiv.org/abs/2204.09739 (URL)
Funding
- NSF
- AST-2007068
- NSF
- AST-2009136
- NSF
- AST-2009177
- Heising-Simons Foundation
Dates
- Created
-
2022-06-07Created from EPrint's datestamp field
- Updated
-
2022-06-07Created from EPrint's last_modified field
Caltech Custom Metadata
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)