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The Gaia Ultra-Cool Dwarf Sample – III: seven new multiple systems containing at least one Gaia DR2 ultracool dwarf

Marocco, F. and Smart, R. L. and Mamajek, E. E. and Sarro, L. M. and Burgasser, A. J. and Caballero, J. A. and Rees, J. M. and Caselden, D. and Cruz, K. L. and Van Linge, R. and Pinfield, D. J. (2020) The Gaia Ultra-Cool Dwarf Sample – III: seven new multiple systems containing at least one Gaia DR2 ultracool dwarf. Monthly Notices of the Royal Astronomical Society, 494 (4). pp. 4891-4906. ISSN 0035-8711. doi:10.1093/mnras/staa1007.

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We present 10 new ultracool dwarfs in seven wide binary systems discovered using Gaia second data release data, identified as part of our Gaia Ultra-Cool Dwarf Sample project. The seven systems presented here include an L1 companion to the G5 IV star HD 164507, an L1: companion to the V478 Lyr AB system, an L2 companion to the metal-poor K5 V star CD-28 8692, an M9 V companion to the young variable K0 V star LT UMa, and three low-mass binaries consisting of late Ms and early Ls. The HD 164507, CD-28 8692, V478 Lyr, and LT UMa systems are particularly important benchmarks, because the primaries are well characterized and offer excellent constraints on the atmospheric parameters and ages of the companions. We find that the M8 V star 2MASS J23253550+4608163 is ∼2.5 mag overluminous compared to M dwarfs of similar spectral type, but at the same time it does not exhibit obvious peculiarities in its near-infrared spectrum. Its overluminosity cannot be explained by unresolved binarity alone. Finally, we present an L1+L2 system with a projected physical separation of 959 au, making this the widest L + L binary currently known.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Marocco, F.0000-0001-7519-1700
Smart, R. L.0000-0002-4424-4766
Mamajek, E. E.0000-0003-2008-1488
Burgasser, A. J.0000-0002-6523-9536
Caselden, D.0000-0001-7896-5791
Cruz, K. L.0000-0002-1821-0650
Additional Information:© 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model ( Accepted 2020 April 7. Received 2020 April 6; in original form 2019 September 26. We thank the anonymous referee for helpful suggestions that improved the quality of this paper. Based on observations obtained at the Hale Telescope, Palomar Observatory as part of a continuing collaboration between the California Institute of Technology, NASA/JPL, Yale University, and the National Astronomical Observatories of China. We thank the staff of Palomar Observatory for successful nights of observing with TripleSpec, in particular Carolyn Heffner, Paul Nied, Joel Pearman, Kajsa Peffer, and Kevin Rykoski. FM acknowledges support by the NASA Postdoctoral Program at the Jet Propulsion Laboratory, administered by Universities Space Research Association under a contract with NASA. Part of this research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with NASA. This work has made use of data from the European Space Agency (ESA) mission Gaia (, processed by the Gaia Data Processing and Analysis Consortium (DPAC, Funding for the DPAC has been provided by national institutions, in particular the institutions participating in the Gaia Multilateral Agreement. SPLAT is a collaborative project of research students in UCSD Cool Star Lab. Contributors to SPLAT have included Christian Aganze, Jessica Birky, Daniella Bardalez Gagliuffi, Adam Burgasser (PI), Caleb Choban, Andrew Davis, Ivanna Escala, Aishwarya Iyer, Yuhui Jin, Mike Lopez, Alex Mendez, Gretel Mercado, Elizabeth Moreno Hilario, Johnny Parra, Maitrayee Sahi, Adrian Suarez, Melisa Tallis, Tomoki Tamiya, Chris Theissen and Russell van Linge. This project is supported by the National Aeronautics and Space Administration under grant no. NNX15AI75G. This publication makes use of VOSA, developed under the Spanish Virtual Observatory project supported by the Spanish MINECO through grant AyA2017-84089.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Yale UniversityUNSPECIFIED
National Astronomical Observatories, Chinese Academy of Sciences (NAOC)UNSPECIFIED
NASA Postdoctoral ProgramUNSPECIFIED
Gaia Multilateral AgreementUNSPECIFIED
Ministerio de Economía, Industria y Competitividad (MINECO)AyA2017-84089
Subject Keywords:binaries: visual, brown dwarfs, stars: individual: HD 164507, V478 Lyr, CD-28 8692, LT UMa, stars: low-mass
Issue or Number:4
Record Number:CaltechAUTHORS:20200625-112850198
Persistent URL:
Official Citation:F Marocco, R L Smart, E E Mamajek, L M Sarro, A J Burgasser, J A Caballero, J M Rees, D Caselden, K L Cruz, R Van Linge, D J Pinfield, The Gaia Ultra-Cool Dwarf Sample – III: seven new multiple systems containing at least one Gaia DR2 ultracool dwarf., Monthly Notices of the Royal Astronomical Society, Volume 494, Issue 4, June 2020, Pages 4891–4906,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:104052
Deposited By: George Porter
Deposited On:25 Jun 2020 21:13
Last Modified:16 Nov 2021 18:27

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