Discovery of a 66 mas ultracool binary with laser guide star adaptive optics

Nick Siegler, Laird M Close, Adam J. Burgasser, Kelle L. Cruz, Christian Marois, Bruce Macintosh, Travis S Barman

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

We present the discovery of 2MASS J21321145+1341584AB as a closely separated (0.066″), very low mass field dwarf binary, resolved in the near-infrared by the Keck II telescope using laser guide star adaptive optics. Physical association is deduced from the angular proximity of the components and constraints on their common proper motion. We have obtained a near-infrared spectrum of the binary and find that it is best described by an L5 ± 0.5 primary and an L7.5 ± 0.5 secondary. Model-dependent masses predict that the two components straddle the hydrogen-burning limit threshold, with the primary likely stellar and the secondary likely substellar. The properties of this system - close projected separation (1.8 ± 0.3 AU) and near-unity mass ratio - are consistent with previous results for very low mass field binaries. The relatively short estimated orbital period of this system (∼7-12 yr) makes it a good target for dynamical mass measurements. It is interesting to note that the system's angular separation is the tightest yet for any very low mass binary published from a ground-based telescope and that it is the tightest binary discovered with laser guide star adaptive optics to date.

Original languageEnglish (US)
Pages (from-to)2320-2326
Number of pages7
JournalAstronomical Journal
Volume133
Issue number5
DOIs
StatePublished - May 2007

Fingerprint

laser guide stars
adaptive optics
laser
telescopes
near infrared
proper motion
mass ratios
proximity
unity
infrared spectra
orbitals
hydrogen
thresholds

Keywords

  • Binaries: visual
  • Stars: individual (2MASS J21321145+1341584)
  • Stars: low-mass, brown dwarfs

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Discovery of a 66 mas ultracool binary with laser guide star adaptive optics. / Siegler, Nick; Close, Laird M; Burgasser, Adam J.; Cruz, Kelle L.; Marois, Christian; Macintosh, Bruce; Barman, Travis S.

In: Astronomical Journal, Vol. 133, No. 5, 05.2007, p. 2320-2326.

Research output: Contribution to journalArticle

Siegler, N, Close, LM, Burgasser, AJ, Cruz, KL, Marois, C, Macintosh, B & Barman, TS 2007, 'Discovery of a 66 mas ultracool binary with laser guide star adaptive optics', Astronomical Journal, vol. 133, no. 5, pp. 2320-2326. https://doi.org/10.1086/513273
Siegler N, Close LM, Burgasser AJ, Cruz KL, Marois C, Macintosh B et al. Discovery of a 66 mas ultracool binary with laser guide star adaptive optics. Astronomical Journal. 2007 May;133(5):2320-2326. https://doi.org/10.1086/513273
Siegler, Nick ; Close, Laird M ; Burgasser, Adam J. ; Cruz, Kelle L. ; Marois, Christian ; Macintosh, Bruce ; Barman, Travis S. / Discovery of a 66 mas ultracool binary with laser guide star adaptive optics. In: Astronomical Journal. 2007 ; Vol. 133, No. 5. pp. 2320-2326.
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