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arXiv 1001.3091astro-ph.EP
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用偏振测量法导出太阳系外行星的轨道参数

Orbital parameters of extrasolar planets derived from polarimetry

D. M. Fluri, S. V. Berdyugina

摘要:

太阳系外行星的偏振测量成为研究太阳系外行星的新工具,这就要求发展诊断技术和参数案例研究。我们的目标是发展一个理论模型,可用于解释太阳系外行星的偏振观测。在这里,我们提出了一个理论参数的研究,显示了各种相关参数的极化曲线的影响。此外,我们调查的拟合过程的鲁棒性。我们采用物理学的瑞利散射获得偏振曲线的一个未解决的太阳系外行星。对两种情况进行计算:(i)假设来自朗伯球的散射光的强度的角分布和来自瑞利型散射体的偏振的角分布,以及(ii)假设散射光的强度和偏振都根据瑞利定律分布。我们表明,这两种情况之间的差异是可以忽略不计的极化曲线的形状。此外,我们还考虑了主恒星的大小,这与围绕巨星运行的热彗星有关。

英文摘要:

Polarimetry of extrasolar planets becomes a new tool for their investigation, which requires the development of diagnostic techniques and parameter case studies. Our goal is to develop a theoretical model which can be applied to interpret polarimetric observations of extrasolar planets. Here we present a theoretical parameter study that shows the influence of the various involved parameters on the polarization curves. Furthermore, we investigate the robustness of the fitting procedure. We employ the physics of Rayleigh scattering to obtain polarization curves of an unresolved extrasolar planet. Calculations are made for two cases: (i) assuming an angular distribution for the intensity of the scattered light as from a Lambert sphere and for polarization as from a Rayleigh-type scatterer, and (ii) assuming that both the intensity and polarization of the scattered light are distributed according to the Rayleigh law. We show that the difference between these two cases is negligible for the shapes of the polarization curves. In addition, we take the size of the host star into account, which is relevant for hot Jupiters orbiting giant stars.

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