WASP-1：一颗富含锂和金属的恒星，拥有一颗超大行星
WASP-1: A lithium- and metal-rich star with an oversized planet
摘要：
在本文中，我们提出了一个全面的spectroscopicanalysis的结果WASP-1，宿主恒星的系外行星WASP-1b。我们推导出T_eff = 6110 +/- 45 K，log g = 4.28 +/- 0.15，[M/H] = 0.23 +/- 0.08，以及高丰度的锂，log n（Li）= 2.91 +/- 0.05。这些参数表明该系统的年龄为1- 3Gyr，恒星质量为1.25- 1.35M_sun。这意味着WASP-1的性质与HD 149026非常相似，HD 149026是迄今为止发现的密度最高的行星的宿主恒星。此外，它们的行星在轨道上的距离相当，从它们的宿主恒星接收的辐射通量也相当。然而，尽管WASP-1与HD 149026相似，但它们的行星具有强烈的密度差异。这表明，气态巨行星的密度不是一个简单的函数的主恒星金属丰度或辐射环境的年龄约2 Gyr。
英文摘要：
In this paper we present our results of a comprehensive spectroscopicanalysis of WASP-1, the host star to the exoplanet WASP-1b. We derive T_eff = 6110 +/- 45 K, log g = 4.28 +/- 0.15, and [M/H] = 0.23 +/- 0.08, and also a high abundance of lithium, log n(Li) = 2.91 +/- 0.05. These parameters suggests an age for the system of 1-3 Gyr and a stellar mass of 1.25-1.35 M_sun. This means that WASP-1 has properties very similar to those of HD 149026, the host star for the highest density planet yet detected. Moreover, their planets orbit at comparable distances and receive comparable irradiating fluxes from their host stars. However, despite the similarity of WASP-1 with HD 149026, their planets have strongly different densities. This suggests that gas-giant planet density is not a simple function of host-star metallicity or of radiation environment at ages of ~2 Gyr.
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