Hostname: page-component-7bb8b95d7b-dtkg6 Total loading time: 0 Render date: 2024-10-04T20:21:39.656Z Has data issue: false hasContentIssue false
  • English
  • Français

Wide Binaries in TGAS: Search Method and First Results

Published online by Cambridge University Press:  07 March 2018

Jeff J. Andrews Open the ORCID record for Jeff J. Andrews [Opens in a new window] ,
Julio Chanamé  and
Marcel A. Agüeros
Jeff J. Andrews
Affiliation:
Foundation for Research and Technology - Hellas, IESL, Voutes, 71110 Heraklion, Greece email: andrews@physics.uoc.gr Physics Department & Institute of Theoretical & Computational Physics, University of Crete, 71003 Heraklion, Crete, Greece
Julio Chanamé
Affiliation:
Instituto de Astrofísica, Pontificia Universidad Católica de Chile, Av. Vicuña Mackenna 4860, 782-0436 Macul, Santiago, Chile Millennium Institute of Astrophysics, Santiago, Chile
Marcel A. Agüeros
Affiliation:
Department of Astronomy, Columbia University, 550 West 120th Street, New York, NY 10027, USA
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

Half of all stars reside in binary systems, many of which have orbital separations in excess of 1000 AU. Such binaries are typically identified in astrometric catalogs by matching the proper motions vectors of close stellar pairs. We present a fully Bayesian method that properly takes into account positions, proper motions, parallaxes, and their correlated uncertainties to identify widely separated stellar binaries. After applying our method to the >2 × 106 stars in the Tycho-Gaia astrometric solution from Gaia DR1, we identify over 6000 candidate wide binaries. For those pairs with separations less than 40,000 AU, we determine the contamination rate to be ≈5%. This sample has an orbital separation (a) distribution that is roughly flat in log space for separations less than ~5000 AU and follows a power law of a−1.6 at larger separations.

Keywords

binaries: visualastrometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 12 , Symposium S330: Astrometry and Astrophysics in the Gaia sky , April 2017 , pp. 297 - 300
Copyright
Copyright © International Astronomical Union 2018 

References

Andrews, J. J., Chanamé, J., & Agüeros, M. A. 2017, ArXiv preprint:1704.07829Google Scholar
Binney, J. & Tremaine, S., 1987, Galactic Dynamics Google Scholar
Chanamé, J. & Gould, A., 2004, ApJ, 601, 289 Google Scholar
Kunder, A., et al. 2017, AJ, 153, 75 Google Scholar
Lépine, S. & Bongiorno, B., 2007, AJ, 133, 889 CrossRefGoogle Scholar
Lépine, S., Rich, R. M., & Shara, M. M., 2007, ApJ, 669, 1235 Google Scholar
Lindegren, L., et al., 2016, A&A, 595, A4 Google Scholar
Luyten, W. J., 1971, Ap&SS, 11, 49 Google Scholar
Raghavan, D., et al., 2010, ApJS, 190, 1 CrossRefGoogle Scholar
Weinberg, M. D., Shapiro, S. L., & Wasserman, I., 1987, ApJ, 312, 367 Google Scholar
Yoo, J., Chanamé, J., & Gould, A., 2004, ApJ, 601, 311 CrossRefGoogle Scholar
Zhao, J. K., Oswalt, T. D., Willson, L. A., Wang, Q., & Zhao, G., 2012, ApJ, 746, 144 Google Scholar