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Searching for Binary Y Dwarfs with the Gemini Multi-Conjugate Adaptive Optics System (GeMS)

Opitz, Daniela and Tinney, C. G. and Faherty, Jacqueline K. and Sweet, Sarah M. and Gelino, Christopher R. and Kirkpatrick, J. Davy (2016) Searching for Binary Y Dwarfs with the Gemini Multi-Conjugate Adaptive Optics System (GeMS). Astrophysical Journal, 819 (1). Art. No. 17. ISSN 0004-637X.

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The NASA Wide-field Infrared Survey Explorer (WISE) has discovered almost all the known members of the new class of Y-type brown dwarfs. Most of these Y dwarfs have been identified as isolated objects in the field. It is known that binaries with L- and T-type brown dwarf primaries are less prevalent than either M-dwarf or solar-type primaries, they tend to have smaller separations and are more frequently detected in near-equal mass configurations. The binary statistics for Y-type brown dwarfs, however, are sparse, and so it is unclear if the same trends that hold for L- and T-type brown dwarfs also hold for Y-type ones. In addition, the detection of binary companions to very cool Y dwarfs may well be the best means available for discovering even colder objects. We present results for binary properties of a sample of five WISE Y dwarfs with the Gemini Multi-Conjugate Adaptive Optics System. We find no evidence for binary companions in these data, which suggests these systems are not equal-luminosity (or equal-mass) binaries with separations larger than ~0.5–1.9 AU. For equal-mass binaries at an age of 5 Gyr, we find that the binary binding energies ruled out by our observations (i.e., 10^(42) erg) are consistent with those observed in previous studies of hotter ultra-cool dwarfs.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Opitz, Daniela0000-0003-4960-1248
Tinney, C. G.0000-0002-7595-0970
Faherty, Jacqueline K.0000-0001-6251-0573
Sweet, Sarah M.0000-0002-1576-2505
Kirkpatrick, J. Davy0000-0003-4269-260X
Additional Information:© 2016 The American Astronomical Society. Received 2015 April 21; accepted 2016 January 20; published 2016 February 24. We gratefully acknowledge the support of ARC Australian Professorial Fellowship grant DP0774000 and ARC Discovery Outstanding Researcher Award DP130102695. D.O. is also supported by CONICYT Becas Chile 72130434. This paper is based on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), the Australian Research Council (Australia), Ministério da Ciência, Tecnologia e Inovação (Brazil) and Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina). Time has been awarded through Australia and USA via programs GS-2014A-Q-4, GS-2013B-Q-26 and also via Guaranteed Time program GS-2014B-C-1. We would like to acknowledge the high standard of support offered by the Gemini queue observing team who acquired most of the data used in this paper. The authors would like to especially acknowledge the extraordinary quality of the instrument delivered for use by our team (and others) by the GSAOI Principal Investigator Professor Peter McGregor and his team at the Australian National University. We thank Dr. R. Sharp for his assistance in acquiring data for this program during GSAOI Guaranteed Time. We also thank Dr. D. Wright for helpful comments and suggestions on this manuscript. Facilities: GEMINI (GeMS-GSAOI) - .
Funding AgencyGrant Number
Australian Research CouncilDP0774000
Australian Research CouncilDP130102695
Comisión Nacional de Investigación Científica y Tecnológica (CONICYT)72130434
Subject Keywords:binaries: general; brown dwarfs; methods: observational; stars: low-mass; techniques: image processing
Issue or Number:1
Record Number:CaltechAUTHORS:20160418-082953831
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Official Citation:Daniela Opitz et al 2016 ApJ 819 17
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:66227
Deposited By: Ruth Sustaita
Deposited On:18 Apr 2016 15:51
Last Modified:20 Feb 2020 22:24

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