ON THE RADII OF BROWN DWARFS MEASURED WITH AKARI NEAR-INFRARED SPECTROSCOPY
ON THE RADII OF BROWN DWARFS MEASURED WITH AKARI NEAR-INFRARED SPECTROSCOPY
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DOI：
10.1088/0004-637x/767/1/77
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发表时间：
2013-03
期刊：
影响因子：
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通讯作者：
S. Sorahana;I. Yamamura;H. Murakami
中科院分区：
文献类型：
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作者：
S. Sorahana;I. Yamamura;H. Murakami
利用观测到的16颗棕矮星的辐散和观测通量与模型通量的比值，计算了它们的半径。我们发现棕矮星的半径范围在0.64-1.13 RJ之间，平均半径为0.83 RJ。我们发现半径和Teff之间的关系有一个趋势，在Teff = 1600 K处半径最小，这对应于中晚期L的光谱类型。这一结果可以用半径-质量和半径-年龄的关系来解释，这在理论上是对年龄大于108年的棕矮星的预期。
We derive the radii of 16 brown dwarfs observed by AKARI using their parallaxes and the ratios of observed to model fluxes. We find that the brown dwarf radius ranges between 0.64–1.13 RJ with an average radius of 0.83 RJ. We find a trend in the relation between radii and Teff; the radius is at a minimum at Teff ∼ 1600 K, which corresponds to the spectral types of mid- to late-L. The result is interpreted by a combination of radius–mass and radius–age relations that are theoretically expected for brown dwarfs older than 108 yr.