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首页> 外文期刊>The Astrophysical Journal. Letters >Carma interferometric observations of 2MASS J044427+2512: The first spatially resolved observations of thermal emission of a brown dwarf disk
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Carma interferometric observations of 2MASS J044427+2512: The first spatially resolved observations of thermal emission of a brown dwarf disk

机译:2MASS J044427 + 2512的Carma干涉测量观测:棕矮星盘热发射的第一个空间分辨观测

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摘要

We present CARMA 1.3 mm continuum data of the disk surrounding the young brown dwarf 2MASS J044427+2512 in the Taurus molecular cloud. The high angular resolution of the CARMA observations (0.″16) allows us to spatially resolve for the first time the thermal emission from dust around a brown dwarf. We analyze the interferometric visibilities and constrain the disk outer radius adopting disk models with power-law radial profiles of the dust surface density. In the case of a power-law index ≤1, we obtain a disk radius in the range of about 15-30 AU, while larger disks are inferred for steeper radial profiles. By combining this information on the disk spatial extent with the sub-mm spectral index of this source, we find conclusive evidence for mm-sized grains, or larger, in this brown dwarf disk. We discuss the implications of our results on the models of dust evolution in protoplanetary disks and brown dwarf formation.
机译:我们提出金牛座分子云中围绕年轻棕矮星2MASS J044427 + 2512的磁盘的CARMA 1.3毫米连续数据。 CARMA观测值的高角度分辨率(0。''16)使我们第一次在空间上解析褐矮星周围尘埃的热辐射。我们分析了干涉的可见性,并采用具有灰尘表面密度幂律径向轮廓的圆盘模型来限制圆盘的外半径。在幂律指数≤1的情况下,我们获得的圆盘半径约为15-30 AU,而可以推断出较大的圆盘用于更陡峭的径向轮廓。通过将磁盘空间范围上的信息与该源的亚毫米光谱指数结合起来,我们找到了在这个棕色矮星盘中毫米大小或更大的晶粒的确凿证据。我们讨论了我们的结果对原行星盘中尘埃演化模型和褐矮星形成的影响。

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