HD 75289 Ab重访-寻找从热木星反射的星光
HD 75289Ab revisited - Searching for starlight reflected from a hot Jupiter
摘要：
目标。我们试图探测从热木星反射的星光，围绕主序星HD 75289 Ab运行。我们报告了另一个研究小组以前提出的这个行星系统的观测结果的修订分析。方法.我们分析高精度，高分辨率的光谱，收集了四个晚上使用UVES在VLT/UT 2，通过数据合成。我们试图解释我们的数据使用不同的大气模型热彗星。结果我们没有发现任何反射光的证据，因此，在99.9%的显著性水平上建立了行星-恒星通量比的修订上限。在高轨道倾角下，获得最佳灵敏度，我们可以将相对反射辐射限制在e = 6.7 x 10-5（假设为灰色椭圆函数）和e = 8.3 x 10-5（假设为IV类函数）以下。这意味着，在行星半径为1.2 RJup的情况下，灰色的椭圆形和IV类椭圆形的几何椭圆形分别小于p = 0.46和p = 0.57。
英文摘要：
Aims. We attempt to detect starlight reflected from a hot Jupiter, orbiting the main-sequence star HD 75289Ab. We report a revised analysis of observations of this planetary system presented previously by another research group. Methods. We analyse high-precision, high-resolution spectra, collected over four nights using UVES at the VLT/UT2, by way of data synthesis. We try to interpret our data using different atmospheric models for hot Jupiters. Results. We do not find any evidence for reflected light, and, therefore, establish revised upper limits to the planet-to-star flux ratio at the 99.9% significance level. At high orbital inclinations, where the best sensitivity is attained, we can limit the relative reflected radiation to be less than e = 6.7 x 10-5 assuming a grey albedo, and e = 8.3 x 10-5 assuming an Class IV function, respectively. This implies a geometric albedo smaller than p = 0.46 and p = 0.57, for the grey albedo and the Class IV albedo shape, respectively, assuming a planetary radius of 1.2 RJup.
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