对假定行星PTFO 8- 8695 b及其潜在旋进母星参数的重新评估
A reappraisal of parameters for the putative planet PTFO 8-8695b and its potentially precessing parent star
摘要：
PTFO 8-8695系统中已发表的褪色事件的光度学是使用改进的恒星几何形状，表面强度，特别是重力暗化的处理方法来模拟的，目的是检验行星凌日假说。衰落事件的形态变化可以通过采用对流包络重力暗化再现，但近临界恒星旋转是必需的。这导致与光谱观测不一致;该模型还预测了与恒星岁差相关的大量光度变化，与观测相反。此外，轨道角动量与转动角动量的经验比值与物理上合理的值不一致。一颗系外行星经过一颗进动的、重力变暗的恒星可能不是这个系统中周期性衰落事件的正确解释。
英文摘要：
Published photometry of fading events in the PTFO 8-8695 system is modelled using improved treatments of stellar geometry, surface intensities, and, particularly, gravity darkening, with a view to testing the planetary-transit hypothesis. Variability in the morphology of fading events can be reproduced by adopting convective-envelope gravity darkening, but near-critical stellar rotation is required. This leads to inconsistencies with spectroscopic observations; the model also predicts substantial photometric variability associated with stellar precession, contrary to observations. Furthermore, the empirical ratio of orbital to rotational angular momenta is at odds with physically plausible values. An exoplanet transiting a precessing, gravity-darkened star may not be the correct explanation of periodic fading events in this system.
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