微引力透镜发现一类极紧致、极低质量的双星褐矮星
太阳与恒星天体物理
2015-06-15 v2
摘要
尽管已提出许多模型，但低质量褐矮星形成的物理机制仍知之甚少。褐矮星质量函数的多重性属性和最小质量为这些机制提供了关键的实证诊断。我们通过引力微透镜发现了两个极低质量、极紧致的双星系统。这些双星系统的总系统质量直接且精确测量为 0.025 Msun 和 0.034 Msun，投影间距分别为 0.31 AU 和 0.19 AU，使其成为已知质量最低且最紧致的场褐矮星双星。此类双星种群的发现表明，褐矮星双星可以稳健地形成，质量至少低至 ~0.02 Msun。未来的微透镜巡天将测量褐矮星双星系统的质量选择样本，随后可将其与类似的恒星双星样本直接进行比较。
引用
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journal= {arXiv preprint arXiv:1302.4169},
year = {2015}
}
备注
7 pages, 5 figures, 3 tables, ApJ submitted