论文标题
I. HD〜3651理想的RV基准
EXPRES I. HD~3651 an Ideal RV Benchmark
论文作者
论文摘要
下一代系外行星狩猎光谱仪应比标准1 m/s的径向速度精度提高径向速度精度的数量级。这一前进对于能够在类似太阳恒星周围检测地球质量行星至关重要。新的校准技术（例如激光频率梳子和稳定的eTalons）确保了仪器稳定性的特征。但是，其他错误来源包括恒星噪声，未发现的短期行星和矫治污染。要了解并最终减轻错误源，必须在最大程度上隔离错误预算中的贡献术语。在这里，我们介绍了一个新的高节奏径向速度程序，即“ Expres 100 Earths”计划，该计划旨在识别明亮的G和附近的G和K矮人周围的岩石行星。我们还提出了一个基准情况：土星质量行星的62-D轨道绕着色球稳定的恒星，HD 3651。高偏心度（0.6）和中等长的轨道时期的组合确保了任何内部行星的显着动态清除。我们针对该行星轨道的开普勒型号的剩余RMS在$ \ sim 6 $ 6美元的基线上为58 cm/s。通过消除径向速度误差预算的重要贡献者，HD 3651是评估极端精度径向速度（EPRV）程序的长期精度的标准。
The next generation of exoplanet-hunting spectrographs should deliver up to an order of magnitude improvement in radial velocity precision over the standard 1 m/s state of the art. This advance is critical for enabling the detection of Earth-mass planets around Sun-like stars. New calibration techniques such as laser frequency combs and stabilized etalons ensure that the instrumental stability is well characterized. However, additional sources of error include stellar noise, undetected short-period planets, and telluric contamination. To understand and ultimately mitigate error sources, the contributing terms in the error budget must be isolated to the greatest extent possible. Here, we introduce a new high cadence radial velocity program, the EXPRES 100 Earths program, which aims to identify rocky planets around bright, nearby G and K dwarfs. We also present a benchmark case: the 62-d orbit of a Saturn-mass planet orbiting the chromospherically quiet star, HD 3651. The combination of high eccentricity (0.6) and a moderately long orbital period, ensures significant dynamical clearing of any inner planets. Our Keplerian model for this planetary orbit has a residual RMS of 58 cm/s over a $\sim 6$ month time baseline. By eliminating significant contributors to the radial velocity error budget, HD 3651 serves as a standard for evaluating the long term precision of extreme precision radial velocity (EPRV) programs.
