论文标题
建模伽玛Draconis的准透明径向速度变化
Modeling the quasiperiodic radial velocity variations of gamma Draconis
论文作者
论文摘要
K5III恒星Gamma Draconis显示出径向速度（RV）变化，与2003 - 2011年的10.7木星质量行星一致。在2011年之后，周期信号衰减，然后以相位移位重新出现。 Hatzes等。 （2018年）表明，伽马DRA的RV变化可能来自振荡对流模式，但不符合数学模型。在这里，我们评估了准周期高斯工艺（GP）是否适合当有限寿命的斑点跟踪潜在的周期性时 - - 可以解释RVS。我们发现，只有一个准膜信号的模型不足：我们需要第二个组件来拟合数据。最佳拟合模型具有P1 = 705天的准周期振荡，P2 = 15天。 705天信号可能是由磁性活动引起的。 15天需要进一步调查。
gamma Draconis, a K5III star, showed radial velocity (RV) variations consistent with a 10.7 Jupiter mass planet from 2003-2011. After 2011, the periodic signal decayed, then reappeared with a phase shift. Hatzes et al. (2018) suggested that gamma Dra's RV variations could come from oscillatory convective modes, but did not fit a mathematical model. Here we assess whether a quasi-periodic Gaussian process (GP)---appropriate when spots with finite lifetimes trace underlying periodicity---can explain the RVs. We find that a model with only one quasiperiodic signal is not adequate: we require a second component to fit the data. The best-fit model has quasi-periodic oscillations with P1 = 705 days and P2 = 15 days. The 705-day signal may be caused by magnetic activity. The 15-day period requires further investigation.
