A near-infrared, wide-field, proper-motion search for brown dwarfs

Joannah L. Hinz, Donald W. McCarthy, Doug A. Simons, Todd J. Henry, J. Davy Kirkpatrick, Patrick C. McGuire

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22 Scopus citations

Abstract

A common proper-motion survey of M dwarf stars within 8 pc of the Sun reveals no new stellar or brown dwarf companions at wide separations (∼100-1400 AU). This survey tests whether the brown dwarf "desert" extends to large separations around M dwarf stars and further explores the census of the solar neighborhood. The sample includes 66 stars north of -30° and within 8 pc of the Sun. Existing first-epoch images are compared with new J-band images of the same fields an average of 7 yr later to reveal proper-motion companions within a ∼4′ radius of the primary star. No new companions are detected to a J-band limiting magnitude of ∼16.5, corresponding to a companion mass of ∼40 Jupiter masses for an assumed age of 5 Gyr at the mean distance of the objects in the survey, 5.8 pc.

Original languageEnglish (US)
Pages (from-to)2027-2032
Number of pages6
JournalAstronomical Journal
Volume123
Issue number4 1756
DOIs
StatePublished - Apr 1 2002

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Keywords

  • Stars: imaging
  • Stars: low-mass, brown dwarfs
  • Stars: statistics

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Hinz, J. L., McCarthy, D. W., Simons, D. A., Henry, T. J., Kirkpatrick, J. D., & McGuire, P. C. (2002). A near-infrared, wide-field, proper-motion search for brown dwarfs. Astronomical Journal, 123(4 1756), 2027-2032. https://doi.org/10.1086/339555