论文标题
NLTT5306B：膨胀，弱照射的棕色矮人
NLTT5306B: an inflated, weakly irradiated brown dwarf
论文作者
论文摘要
我们提出了3.6和4.5微米的Spitzer观测值以及辐射的棕色矮人NLTT5306B的近红外IRTF SPEX光谱。我们确定棕色矮人具有光谱的L5类型，并且尽管白矮人一级恒星的有效温度较低，但可能会膨胀。我们计算了模型半径和棕色矮人的Roche Lobe Radius的Spitzer波段中的亮度温度，并得出结论，昼夜侧差很少。我们讨论了可能会膨胀NLTT5306B的各种机制，并确定虽然低质量棕色矮人（M <35 MJUP）很容易被其宿主恒星的照射膨胀，但很少有较高的质量棕色矮人膨胀了。膨胀的较高质量棕色矮人可能会因磁相互作用而膨胀，也可能具有较厚的云。
We present Spitzer observations at 3.6 and 4.5 microns and a near-infrared IRTF SpeX spectrum of the irradiated brown dwarf NLTT5306B. We determine that the brown dwarf has a spectral type of L5 and is likely inflated, despite the low effective temperature of the white dwarf primary star. We calculate brightness temperatures in the Spitzer wavebands for both the model radius, and Roche Lobe radius of the brown dwarf, and conclude that there is very little day-night side temperature difference. We discuss various mechanisms by which NLTT5306B may be inflated, and determine that while low mass brown dwarfs (M<35 MJup) are easily inflated by irradiation from their host star, very few higher mass brown dwarfs are inflated. The higher mass brown dwarfs that are inflated may be inflated by magnetic interactions or may have thicker clouds.
