A resolved outflow of matter from a brown dwarf
A resolved outflow of matter from a brown dwarf
复制标题
已解决的褐矮星物质流出
DOI：
10.1038/nature03598
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发表时间：
2005
期刊：
影响因子：
64.8
通讯作者：
S. Randich
中科院分区：
文献类型：
--
作者：
E. Whelan;T. Ray;F. Bacciotti;A. Natta;L. Testi;S. Randich
恒星的诞生不仅涉及吸积，而且与直觉相反，还涉及物质以高度超音速外流的形式排出。虽然这种现象已经在年轻恒星中观察到，但一个根本的问题是它是否也发生在新生的褐矮星中：这些是所谓的“失败的恒星”，质量介于恒星和行星之间，永远无法达到足够高的温度来进行正常的氢聚变。最近，年轻的褐矮星吸积的证据越来越多，它们的光谱显示出暗示外流的线条。在这里，我们报告光谱天文测量数据，空间解决流出的棕矮星。外流的特征看起来类似于正常年轻恒星的外流，但规模较小。这一结果表明，外流机制是普遍的，甚至可能与行星的形成有关。
The birth of stars involves not only accretion but also, counter-intuitively, the expulsion of matter in the form of highly supersonic outflows. Although this phenomenon has been seen in young stars, a fundamental question is whether it also occurs among newborn brown dwarfs: these are the so-called ‘failed stars’, with masses between stars and planets, that never manage to reach temperatures high enough for normal hydrogen fusion to occur. Recently, evidence for accretion in young brown dwarfs has mounted, and their spectra show lines that are suggestive of outflows. Here we report spectro-astrometric data that spatially resolve an outflow from a brown dwarf. The outflow's characteristics appear similar to, but on a smaller scale than, outflows from normal young stars. This result suggests that the outflow mechanism is universal, and perhaps relevant even to the formation of planets.
影响因子：
3.2
作者：
V. Mannings;A. Boss;S. Russell
通讯作者：
V. Mannings;A. Boss;S. Russell