论文标题
附近的气态行星的行星参数，XUV环境和质量损失率，带有X射线的宿主明星
Planetary parameters, XUV environments and mass-loss rates for nearby gaseous planets with X-ray detected host-stars
论文作者
论文摘要
我们利用Gaia Dr2偏见距离来提供对行星参数和X射线照射的新估算值，以提供27个气体行星（从超级杂货商到热jupiters）的27个气体行星的距离（$ \ \ lyssim 100 $ PC）的样本，并进行了公共可用的Chandra和/或XMM的观察，我们对此进行了启用数据。对于具有X射线检测到的宿主星的20个行星，我们利用光电离水动力学代码ATE来得出更新的大气质量流出率。新得出的质量/半径与五个系统的euu值不一致。 HD 149026B和WASP-38，用于质量； Radii的Au Mic B，HAT-P-20和HAT-P-2。值得注意的是，较低的质量意味着HD 149026 b的（土星状的）密度为$ 0.86 \ pm 0.09 $ g cm $^{ - 3} $。该独立估计与文献中报告的最低值一致。另外，我们首次报告了GJ 9827，HD 219134和LHS 1140的X射线检测。 The inferred stellar X-ray luminosity of LHS 1140 ($1.34^{+0.19}_{-0.21} \times 10^{26}$ erg sec$^{-1}$) implies that LHS 1140 b is the least irradiated transiting super-Earth known to orbit within the habitable zone of a nearby M-dwarf.
We leverage Gaia DR2 parallactic distances to deliver new or revised estimates of planetary parameters and X-ray irradiation for a distance-limited ($\lesssim 100$ pc) sample of 27 gaseous planets (from super-Earths to hot Jupiters) with publicly available Chandra and/or XMM observations, for which we carry out a homogeneous data reduction. For 20 planets with X-ray detected host stars we make use of the photoionization hydrodynamics code ATES to derive updated atmospheric mass outflow rates. The newly derived masses/radii are not consistent with the exoplanet.eu values for five systems; HD 149026b and WASP-38, for mass; and Au Mic b, HAT-P-20 and HAT-P-2 for radii. Notably, the lower mass implies a (Saturn-like) density of $0.86\pm 0.09$ g cm$^{-3}$ for HD 149026 b. This independent estimate is consistent with the lowest values reported in the literature. Separately, we report on the X-ray detection of GJ 9827, HD 219134 and LHS 1140 for the first time. The inferred stellar X-ray luminosity of LHS 1140 ($1.34^{+0.19}_{-0.21} \times 10^{26}$ erg sec$^{-1}$) implies that LHS 1140 b is the least irradiated transiting super-Earth known to orbit within the habitable zone of a nearby M-dwarf.
