The distribution of companions to ultracool dwarfs

P. R. Allen, I. N. Reid, D. W. Koerner

Research output: Contribution to journalConference articlepeer-review


Results of an extensive survey for wide companions around late-M and L dwarfs, using NASA's IRTF are presented. No companions have been detected thus far. We develop a Bayesian statistical approach to the study of the ultracool dwarf companion distribution. This Bayesian method is applied to the analysis of several extant surveys of ultracool dwarfs for companions. Our Bayesian results indicate that the companion distribution to ultracool dwarfs is fundamentally different from that of higher mass stars. In particular, we demonstrate, to ∼4σ, that the mass function of brown dwarf companions is different than the mass function of their primaries.

Original languageEnglish (US)
Pages (from-to)385-388
Number of pages4
JournalEuropean Space Agency, (Special Publication) ESA SP
Issue number560 I
StatePublished - 2005
Event13th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun - Hamburg, Germany
Duration: Jul 5 2004Jul 9 2004


  • Brown dwarfs
  • Stars: very low-mass

ASJC Scopus subject areas

  • Aerospace Engineering
  • Space and Planetary Science


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