论文标题
基于苔丝和竖琴观测,光度变异性与径向速度抖动之间的相关性
The correlation between photometric variability and radial velocity jitter, based on TESS and HARPS observations
论文作者
论文摘要
当前和即将进行的高精度光度调查(例如Tess,Cheops和Plato)将为社区提供成千上万的新系外行星候选人。结果,这种相关性的存在对于选择最低的RV抖动的目标至关重要。这种类型的研究对于设计优化的观察策略也至关重要。我们的目标是评估在不同时间尺度上高精度光度变异性测量和高精度RV抖动之间的相关性。我们分析了171 g,k和M星,具有可用的苔丝高精度光度序列和竖琴精确的RV。我们得出了样品中恒星的恒星参数,并测量了RV抖动和光度变异性。我们还估计了Chomospher Ca II H $ \&$ K活动指标$ log(r'_ {hk})$,$ \ textit {v sin I} $和恒星旋转期。最后,我们评估不同的恒星参数和RV采样子集如何对潜在相关产生影响。我们发现光度法变异性与RV抖动之间的相关性是苔丝光度观察与竖琴RV之间的时间间隔的功能。随着考虑分析的观测值的时间间隔增加,相关值和意义变得更小,较弱,以至于它变得可忽略不计。我们还发现,对于高于6.5 ppt的光度变异性的恒星相关性明显更强。我们表明,这样的结果可能是由于现场主导和以外表为主的制度之间的过渡。我们量化了相关性,并更新了Chomospheric Ca II H $ \&$ K活动指标$ log(r'_ {hk})$和RV抖动之间的关系。
The current and upcoming high precision photometric surveys such as TESS, CHEOPS, and PLATO will provide the community with thousands of new exoplanet candidates. As a consequence, the presence of such a correlation is crucial in selecting the targets with the lowest RV jitter for efficient RV follow-up of exoplanetary candidates. Studies of this type are also crucial to design optimized observational strategies to mitigate RV jitter when searching for Earth-mass exoplanets. Our goal is to assess the correlation between high-precision photometric variability measurements and high-precision RV jitter over different time scales. We analyze 171 G, K, and M stars with available TESS high precision photometric time-series and HARPS precise RVs. We derived the stellar parameters for the stars in our sample and measured the RV jitter and photometric variability. We also estimated chromospheric Ca II H $\&$ K activity indicator $log(R' _{HK})$, $\textit{v sin i}$, and the stellar rotational period. Finally, we evaluate how different stellar parameters and a RV sampling subset can have an impact on the potential correlations. We find a varying correlation between the photometric variability and RV jitter as function of time intervals between the TESS photometric observation and HARPS RV. As the time intervals of the observations considered for the analysis increases, the correlation value and significance becomes smaller and weaker, to the point that it becomes negligible. We also find that for stars with a photometric variability above 6.5 ppt the correlation is significantly stronger. We show that such a result can be due to the transition between the spot-dominated and the faculae-dominated regime. We quantified the correlations and updated the relationship between chromospheric Ca II H $\&$ K activity indicator $log(R' _{HK})$ and RV jitter.