论文标题
F恒星具有稳定径向速度时间的特性:选择低射线F星的有用度量
Properties of F Stars with Stable Radial Velocity Timeseries: A Useful Metric for Selecting Low-jitter F Stars
论文作者
论文摘要
在同伴论文中,我们对超过600颗恒星的径向速度抖动进行了深入分析,研究了天体物理的起源,包括恒星颗粒,振荡和磁性活性。在本文中,我们重点介绍了这些恒星的子样本,特别是主序列和“退休” F星(我们称为“ MSRF”星 - 显示出较低的RV抖动($ <10 $ m/s)。我们描述了这些恒星的观察性特征,这些恒星可以在径向速度行星程序中识别出它们,例如那些对苔丝发现的过境行星进行后续行动的人。我们引入了一个“抖动指标”,将RV抖动的两种竞争效果与年龄:活动和对流相结合。使用抖动指标中的阈值,我们可以选择低抖动F星的“完整”和“纯”样品。我们还提供了仅使用Gaia颜色和大小来识别这些恒星的食谱。最后,我们描述了Gaia颜色磁性图中低抖动F恒星最浓缩的区域。通过将第9阶多项式拟合到Gaia主序列,我们将高度上方的高度用作进化的代理,当活动测量不可用时,允许对低抖动MSRF恒星进行粗略选择。
In a companion paper, we have conducted an in-depth analysis of radial velocity jitter of over 600 stars, examining the astrophysical origins including stellar granulation, oscillation, and magnetic activity. In this paper, we highlight a subsample of those stars, specifically the main sequence and "retired" F stars -- which we refer to as "MSRF" stars -- that show low levels of RV jitter ($<10$ m/s). We describe the observational signatures of these stars that allow them to be identified in radial velocity planet programs, for instance those performing follow-up of transiting planets discovered by TESS. We introduce a "jitter metric" that combines the two competing effects of RV jitter with age: activity and convection. Using thresholds in the jitter metric, we can select both "complete" and "pure" samples of low jitter F stars. We also provide recipes for identifying these stars using only Gaia colors and magnitudes. Finally, we describe a region in the Gaia color-magnitude diagram where low jitter F stars are most highly concentrated. By fitting a 9th order polynomial to the Gaia main sequence, we use the height above the main sequence as a proxy for evolution, allowing for a crude selection of low jitter MSRF stars when activity measurements are otherwise unavailable.