Hubble Space Telescope astrometry of the closest brown dwarf binary system - I. Overview and improved orbit

L. R. Bedin, D. Pourbaix, D. Apai, A. J. Burgasser, E. Buenzli, H. M.J. Boffin, M. Libralato

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

Located at 2 pc, the L7.5+T0.5 dwarfs system WISE J104915.57-531906.1 (Luhman 16 AB) is the third closest system known to Earth, making it a key benchmark for detailed investigation of brown dwarf atmospheric properties, thermal evolution, multiplicity, and planet-hosting frequency. In the first study of this series - based on a multicycle Hubble Space Telescope (HST) program - we provide an overview of the project and present improved estimates of positions, proper motions, annual parallax, mass ratio, and the current best assessment of the orbital parameters of the A-B pair. Our HST observations encompass the apparent periastron of the binary at 220.5 ± 0.2 mas at epoch 2016.402. Although our data seem to be inconsistent with recent ground-based astrometric measurements, we also exclude the presence of third bodies down to Neptune masses and periods longer than a year.

Original languageEnglish (US)
Pages (from-to)1140-1155
Number of pages16
JournalMonthly Notices of the Royal Astronomical Society
Volume470
Issue number1
DOIs
StatePublished - Sep 1 2017

Keywords

  • Astrometry
  • Binaries: visual
  • Brown dwarfs

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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