标题： L矮星的尘埃散射偏振 显示英文标题

标题： Polarization of L Dwarfs by Dust Scattering

摘要： 计算了由旋转引起的扁平状光球中尘埃散射产生的L0至L6型L矮星偏振度。 假定橄榄石是主要的冷凝物，基于化学平衡模型，推导出不同光谱类型的L矮星大气尘埃分布。 然后利用单次散射模型计算光学波段的偏振度。 发现光学波段预期线性偏振在大约L1型时达到峰值。 对于固定的自转速度，从较热到较冷的天体，偏振度降低。 然而，随着平均颗粒大小的增加，线性偏振度显著减少。 我们拟合了最近观测到的L矮星线性偏振数据，并发现单次散射模型与冷凝物的化学平衡模型相结合，与观测结果一致。 显示英文摘要

摘要： The degree of polarization in L dwarfs of spectral types L0 to L6 resulting from dust scattering in a rotation-induced oblate photosphere is calculated. Assuming that forsterite is the main condensate, the atmospheric dust distribution is derived for different spectral types based on a chemical equilibrium model. The degree of polarization at optical is then calculated using a single scattering model. The expected linear polarization at optical is found to peak at around spectral type L1. For a fixed rotational velocity, the degree of polarization decreases from hotter to cooler objects. However, with the increase in mean grain size, the degree of linear polarization reduces significantly. We fit the recently observed linear polarimetric data of L dwarfs and find that single dust scattering model coupled with the chemical equilibrium models of condensates is consistent with the observational results.