理解云在棕矮星上扩散的一个简单模型

Joseph A. Landsittel, Ryan A. Coldren
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引用次数: 0

摘要

L-T光谱级跃迁中的棕矮星通常会经历光度变化,这是由于在我们视野内外旋转的云的活跃形成/消散。对这些光度振荡的测量,如它们的频率和振幅,可能有助于通过它们与旋转周期和表面温度等方面的关联来约束观测到的棕矮星的物理参数。然而,观测到的棕矮星相对于我们的倾角掩盖了对这些振荡及其意义的测量。通过在玩具模型棕矮星表面创建一个简单的二维云形成模型,本文旨在进一步探索多云棕矮星的振荡幅度和倾角之间的关系,并与Vos等人2017年在观测中发现的这两个因素之间的相关性相一致。
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A Simple Model for Understanding Cloud Diffusion on a Brown Dwarf
Brown dwarfs in the L-T spectral class transition commonly experience photometric variability due to the active formation/dissipation of clouds that rotate in and out of our view. Measurements of these photometric oscillations, such as their frequency and amplitude, may help constrain the physical parameters of observed brown dwarfs through their associations with aspects such as rotational period and surface temperature. However, measurements of these oscillations and their significance are obscured by the inclination angle of observed brown dwarfs relative to us. By creating a simplistic model of 2D cloud formation on the surface of a toy model brown dwarf, this paper aims to further explore the relationship between oscillation amplitude and inclination angle for cloudy brown dwarfs and finds agreement with the correlation found observationally between the two factors in Vos et al., 2017.
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