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首页> 外文期刊>The Astrophysical journal >First Confirmed Detection Of A Bipolar Molecular Outflow From A Young Brown Dwarf
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First Confirmed Detection Of A Bipolar Molecular Outflow From A Young Brown Dwarf

机译：首次确认检测到来自年轻褐矮星的双极分子流出

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摘要

Studying the earliest stages in the birth of stars is crucial for understanding how they form. Brown dwarfs with masses between that of stars and planets are not massive enough to maintain stable hydrogen-burning fusion reactions during most of their lifetime. Their origins are subject to much debate in recent literature because their masses are far below the typical mass where core collapse is expected to occur. We present the first confirmed evidence that brown dwarfs undergo a phase of molecular outflow that is typical of young stars. Using the Submillimeter Array, we have obtained a map of a bipolar molecular outflow from a young brown dwarf. We estimate an outflow mass of 1.6 × 10~(-4) M_☉ and a mass-loss rate of 1.4 × 10~(-9) M_☉. These values are over 2 orders of magnitude smaller than the typical ones for T Tauri stars. From our millimeter continuum data and our own analysis of Spitzer infrared photometry, we estimate that the brown dwarf has a disk with a mass of 8 × 10~(-3) M_☉ and an outer disk radius of 80 AU. Our results demonstrate that the bipolar molecular outflow operates down to planetary masses, occurring in brown dwarfs as a scaled-down version of the universal process seen in young stars.
机译：研究恒星诞生的最早阶段对于理解恒星如何形成至关重要。质量介于恒星和行星之间的棕矮星的质量不足以在其一生的大部分时间内维持稳定的氢燃烧聚变反应。由于它们的质量远远低于预期发生岩心塌陷的典型质量，因此其起源在最近的文献中受到了很多争论。我们提供了第一个证实的证据，即棕矮星经历了年轻恒星典型的分子外流阶段。使用亚毫米波阵列，我们获得了来自年轻褐矮星的双极分子外流图。我们估计流出质量为1.6×10〜（-4）M_☉，质量损失率为1.4×10〜（-9）M_☉。这些值比T Tauri星的典型值小2个数量级。根据毫米连续体数据和我们对Spitzer红外光度法的分析，我们估计棕矮星的盘质量为8×10〜（-3）M_☉，盘外半径为80 AU。我们的研究结果表明，双极分子外流作用到行星质量，发生在棕矮星中，是年轻恒星中普遍过程的按比例缩小版本。

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