NLTT 41135: A field M dwarf + brown dwarf eclipsing binary in a triple system, discovered by the mearth observatory

Jonathan Irwin, Lars Buchhave, Zachory K. Berta, David Charbonneau, David W. Latham, Christopher J. Burke, Gilbert A. Esquerdo, Mark E. Everett, Matthew J. Holman, Philip Nutzman, Perry Berlind, Michael L. Calkins, Emilio E. Falco, Joshua N. Winn, John A. Johnson, J. Zachary Gazak

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47 Scopus citations


We report the discovery of an eclipsing companion to NLTT 41135, a nearby M5 dwarf that was already known to have a wider, slightly more massive common proper motion companion, NLTT 41136, at 2″.4 separation. Analysis of combined-light and RV curves of the system indicates that NLTT 41135B is a (31-34) ± 3MJup brown dwarf (where the range depends on the unknown metallicity of the host star) on a circular orbit. The visual M dwarf pair appears to be physically bound, so the system forms a hierarchical triple, with masses approximately in the ratio 8:6:1. The eclipses are grazing, preventing an unambiguous measurement of the secondary radius, but follow-up observations of the secondary eclipse (e.g., with the James Webb Space Telescope) could permit measurements of the surface brightness ratio between the two objects, and thus place constraints on models of brown dwarfs.

Original languageEnglish (US)
Pages (from-to)1353-1366
Number of pages14
JournalAstrophysical Journal
Issue number2
StatePublished - Aug 1 2010
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


  • Binaries: eclipsing
  • Brown dwarfs
  • Stars: individual (NLTT 41135)
  • Stars: low-mass


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