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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 606246.0, MPI für Astronomie / Publikationen_mpia
A Spitzer IRAC imaging survey for T dwarf companions around M, L, and T dwarfs: observations, results, and Monte Carlo population analyses
Authors:Carson, J. C.; Marengo, M.; Patten, B. M.; Luhman, K. L.; Sonnett, S. M.; Hora, J. L.; Schuster, M. T.; Allen, P. R.; Fazio, G. G.; Stauffer, J. R.; Schnupp, C.
Date of Publication (YYYY-MM-DD):2011
Journal Abbrev.:The Astrophysical Journal
Issue / Number:2
Start Page:141
Audience:Not Specified
Abstract / Description:We report observational techniques, results, and Monte Carlo population analyses from a Spitzer Infrared Array Camera imaging survey for substellar companions to 117 nearby M, L, and T dwarf systems (median distance of 10 pc, mass range of 0.6 to ~0.05 M &sun;). The two-epoch survey achieves typical detection sensitivities to substellar companions of [4.5 μm] <= 17.2 mag for angular separations between about 7'' and 165''. Based on common proper motion analysis, we find no evidence for new substellar companions. Using Monte Carlo orbital simulations (assuming random inclination, random eccentricity, and random longitude of pericenter), we conclude that the observational sensitivities translate to an ability to detect 600-1100 K brown dwarf companions at semimajor axes gsim35 AU and to detect 500-600 K companions at semimajor axes gsim60 AU. The simulations also estimate a 600-1100 K T dwarf companion fraction of <3.4% for 35-1200 AU separations and <12.4% for the 500-600 K companions for 60-1000 AU separations.
Free Keywords:binaries: general; brown dwarfs; infrared: stars; methods: numerical; methods: statistical; stars: late-type; stars: low-mass
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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