Discovery of a companion at the L/T transition with the wide-field infrared survey explorer

N. P. Loutrel, K. L. Luhman, P. J. Lowrance, J. J. Bochanski

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


We report the discovery of a substellar companion to the nearby solar-type star HD46588 (F7V, 17.9pc, τ 3Gyr). HD46588 B was found through a survey for common proper motion companions to nearby stars using data from the Wide-field Infrared Survey Explorer (WISE) and the Two Micron All Sky Survey (2MASS). It has an angular separation of 792 from its primary, which corresponds to a projected physical separation of 1420 AU. We have measured a spectral type of L9 for this object based on near-infrared spectroscopy performed with TripleSpec at Palomar Observatory. We estimate a mass of 0.064+0.008 - 0.019 M from a comparison of its luminosity to the values predicted by theoretical evolutionary models for the age of the primary. Because of its companionship to a well-studied star, HD46588 B is one of the few known brown dwarfs at the L/T transition for which both age and distance estimates are available. Thus, it offers new constraints on the properties of brown dwarfs during this brief evolutionary phase. The discovery of HD46588 B also illustrates the value of the WISE for identifying brown dwarfs in the solar neighborhood via their proper motions.

Original languageEnglish (US)
Article number81
JournalAstrophysical Journal
Issue number2
StatePublished - Oct 1 2011

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'Discovery of a companion at the L/T transition with the wide-field infrared survey explorer'. Together they form a unique fingerprint.

Cite this