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A Candidate Wide Brown Dwarf Binary in the Argus Association: 2MASS J14504216–7841413 and 2MASS J14504113–7841383

Burgasser, Adam J. and Looper, Dagny L. and Kirkpatrick, J. Davy (2017) A Candidate Wide Brown Dwarf Binary in the Argus Association: 2MASS J14504216–7841413 and 2MASS J14504113–7841383. Research Notes of the AAS, 1 (1). Art. No. 42. ISSN 2515-5172. doi:10.3847/2515-5172/aa9ff0.

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Widely-separated (≳100 au) multiples are rare among the lowest mass stars and brown dwarfs (Caballero 2007; Kraus & Hillenbrand 2009), and often (but not exclusively) associated with young (≾100 Myr), nearby stellar associations (e.g., Close et al. 2007). We report the discovery of a wide, very low mass, and potentially young binary, 2MASS J14504216–7841413 and 2MASS J14504113–7841383 (hereafter 2MASS J1450–7841AB). The primary was initially identified in the DENIS (Epchtein et al. 1997) and 2MASS (Skrutskie et al. 2006) surveys as a candidate late-M dwarf based on its red optical/infrared colors (DENIS I = 18.03 ± 0.16, I − J = 3.32 ± 0.19, 2MASS J = 14.71 ± 0.06, J – K_s = 1.38 ± 0.08). A faint red companion, 2MASS J14504113–7841383, is present in the 2MASS Point Source Catalog (J = 15.64 ± 0.09, J – K_s = 1.28 ± 0.14) separated by 4.”23 ± 0.”11 at position angle 314°. We observed 2MASS J1450–7841AB with the Low Dispersion Survey Spectrograph 3 (LDSS-3; Allington-Smith et al. 1994) on the Magellan 6.5 m Clay Telescope on 2007 May 9 (UT). The system was resolved in i- and z-band imaging data at an identical separation (4.”28 ± 0.”14 at 314°; Figure 1) as 2MASS, with Δi = 1.03 ± 0.05 and Δz = 1.01 ± 0.05. Combining astrometry from 2MASS and LDSS-3, we measure identical proper motions of (μ_α cos δ, μδ) = (22 ± 32, −59 ± 34) mas/yr for 2MASS J1450–7841A and (−12 ± 23, −4 ± 23) mas/yr for 2MASS J1450–7841B.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Burgasser, Adam J.0000-0002-6523-9536
Kirkpatrick, J. Davy0000-0003-4269-260X
Additional Information:© 2017 The American Astronomical Society. Received 2017 November 29; Accepted 2017 December 4; Published 2017 December 12. This paper includes data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.
Group:Infrared Processing and Analysis Center (IPAC)
Subject Keywords:binaries: general; brown dwarfs; stars: fundamental parameters; stars: individual (2MASS J14504216–7841413, 2MASS J14504113–7841383) ; stars: low-mass
Issue or Number:1
Record Number:CaltechAUTHORS:20171213-142115992
Persistent URL:
Official Citation:Adam J. Burgasser et al 2017 Res. Notes AAS 1 42
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83888
Deposited By: Tony Diaz
Deposited On:13 Dec 2017 22:33
Last Modified:15 Nov 2021 20:15

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