系外行星宿主恒星等时线拟合与陀螺年代学的差异？
Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?
摘要：
使用样本的68个行星托管恒星我进行比较等时线拟合和gyrochronology调查是否潮汐恒星和它们的行星之间的相互作用导致低估的年龄使用后一种方法。我发现一个轻微的趋势，等时线产生老年人的年龄估计，但没有发现与潮汐时间尺度的相关性，虽然对一些个别系统的影响，潮汐可能会导致更快的旋转比预期的恒星的等时年龄，因此被低估的gyrochronology年龄。通过与星团中的行星系进行比较，我还发现在某些情况下等时线拟合会高估恒星的年龄。在整个样本范围内，任何偏倚的证据都是不确定的。我还考虑了我的样本的子集，其中恒星旋转轴和行星轨道轴之间的天空投影对准角已被测量，发现类似的模式，在完整的样本中确定。然而，未对准和对准系统的样本量较小，无法得出强有力的结论。
英文摘要：
Using a sample of 68 planet-hosting stars I carry out a comparison of isochrone fitting and gyrochronology to investigate whether tidal interactions between the stars and their planets are leading to underestimated ages using the latter method. I find a slight tendency for isochrones to produce older age estimates but find no correlation with tidal time-scale, although for some individual systems the effect of tides might be leading to more rapid rotation than expected from the stars' isochronal age, and therefore an underestimated gyrochronology age. By comparing to planetary systems in stellar clusters, I also find that in some cases isochrone fitting can overestimate the age of the star. The evidence for any bias on a sample-wide level is inconclusive. I also consider the subset of my sample for which the sky-projected alignment angle between the stellar rotation axis and the planet's orbital axis has been measured, finding similar patterns to those identified in the full sample. However, small sample sizes for both the misaligned and aligned systems prevent strong conclusions from being drawn.
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