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24 April 2024 |
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A Spitzer IRAC Imaging Survey for T Dwarf Companions Around M, L, and T Dwarfs: Observations, Results, and Monte Carlo Population Analyses | | Joseph Carson
; Massimo Marengo
; Brian Patten
; Kevin Luhman
; Sarah Sonnett
; Joseph Hora
; Michael Schuster
; Peter Allen
; Giovanni Fazio
; John Stauffer
; Carolin Schnupp
; | | Date: |
10 Oct 2011 | | Abstract: | 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 sim0.05 Modot). The two-epoch survey achieves typical
detection sensitivities to substellar companions of [4.5 {mu}m] leq 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 600-1100K brown dwarf
companions at semimajor axes greater than ~35 AU, and to detect 500-600K
companions at semimajor axes greater than ~60 AU. The simulations also estimate
a 600-1100K T dwarf companion fraction of < 3.4% for 35-1200 AU separations,
and < 12.4% for the 500-600K companions, for 60-1000 AU separations. | | Source: | arXiv, 1110.2191 | | Services: | Forum | Review | PDF | Favorites | |
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