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arXiv 1110.2191astro-ph.SR
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M、L和T矮星周围T矮星伴星的斯皮策IRAC成像巡天:观测、结果和蒙特卡罗总体分析

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

摘要:

我们报告的观测技术,结果,和Monte Carlo人口分析从斯皮策红外线阵列相机成像调查的亚恒星同伴到117个附近的M,L和T矮系统(中位数距离为10 pc,质量范围为0.6至\sim 0.05 M \odot)。两历元巡天对[4.5 μm] \leq 17.2等的亚恒星伴星实现了典型的探测灵敏度,角距在7”和165”之间。基于普通自行分析,我们没有发现新的亚恒星伴星的证据。使用蒙特卡罗轨道模拟(假设随机倾角,随机偏心率和随机近心经度),我们得出的结论是,观测灵敏度转化为能够检测到600- 1100 K的棕矮星同伴在半长轴大于35 AU,并检测到500- 600 K的同伴在半长轴大于60 AU。模拟还估计了600- 1100 K T矮伴星在35-1200 AU分离时的比例< 3.4%,在500- 600 K伴星在60-1000 AU分离时的比例< 12.4%。

英文摘要:

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 M\odot). The two-epoch survey achieves typical detection sensitivities to substellar companions of [4.5 μm] \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.

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