High precision dynamical masses for brown dwarf binaries

Q. M. Konopacky, A. M. Ghez, Travis S Barman, E. L. Rice, I. S. Mclean, G. Duchěne

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

We present new dynamical mass estimates for a sample of brown dwarf binaries with sufficient precision (< 10%) to distinguish between current theoretical evolutionary models. This survey, which has targeted 20 sources between spectral types M8 and T5, is enabled by the advent of laser guide star adaptive optics (LGS AO) on the Keck II 10 m telescope. The LGS AO system allows for both high precision (δpos < 1 mas) astrometry and spatially resolved, high-resolution spectroscopy (δrv < 1 km/s). A striking result from this work thus far is that for two systems with precisely determined dynamical masses and similar spectral types, both evolutionary models considered correctly predict the mass in one case but underpredict the mass by several sigma in the other case. We postulate that this discrepancy may either stem from a disjoint between evolutionary and atmospheric models at the M/L transition due to atmospheric dust treatment or potentially from magnetic activity inhibiting convection.

Original languageEnglish (US)
Title of host publicationAIP Conference Proceedings
Pages112-117
Number of pages6
Volume1094
DOIs
StatePublished - 2009
Externally publishedYes
Event15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - St. Andrews, United Kingdom
Duration: Jul 21 2008Jul 25 2008

Other

Other15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun
CountryUnited Kingdom
CitySt. Andrews
Period7/21/087/25/08

Fingerprint

laser guide stars
adaptive optics
atmospheric models
astrometry
axioms
stems
convection
dust
telescopes
high resolution
estimates
spectroscopy

Keywords

  • Binaries, visual
  • Brown dwarfs
  • Fundamental parameters
  • Individual (2MASSW J0746425+200032.HD 130948BC)
  • Low-mass

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Konopacky, Q. M., Ghez, A. M., Barman, T. S., Rice, E. L., Mclean, I. S., & Duchěne, G. (2009). High precision dynamical masses for brown dwarf binaries. In AIP Conference Proceedings (Vol. 1094, pp. 112-117) https://doi.org/10.1063/1.3099079

High precision dynamical masses for brown dwarf binaries. / Konopacky, Q. M.; Ghez, A. M.; Barman, Travis S; Rice, E. L.; Mclean, I. S.; Duchěne, G.

AIP Conference Proceedings. Vol. 1094 2009. p. 112-117.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Konopacky, QM, Ghez, AM, Barman, TS, Rice, EL, Mclean, IS & Duchěne, G 2009, High precision dynamical masses for brown dwarf binaries. in AIP Conference Proceedings. vol. 1094, pp. 112-117, 15th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun, St. Andrews, United Kingdom, 7/21/08. https://doi.org/10.1063/1.3099079
Konopacky QM, Ghez AM, Barman TS, Rice EL, Mclean IS, Duchěne G. High precision dynamical masses for brown dwarf binaries. In AIP Conference Proceedings. Vol. 1094. 2009. p. 112-117 https://doi.org/10.1063/1.3099079
Konopacky, Q. M. ; Ghez, A. M. ; Barman, Travis S ; Rice, E. L. ; Mclean, I. S. ; Duchěne, G. / High precision dynamical masses for brown dwarf binaries. AIP Conference Proceedings. Vol. 1094 2009. pp. 112-117
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