论文标题

安排苔丝目标的浓缩咖啡跟进策略

Scheduling strategies for the ESPRESSO follow-up of TESS targets

论文作者

Cabona, Lorenzo, Viana, Pedro, Landoni, Marco, Faria, João

论文摘要

预计在未来几年内需要大量昂贵的望远镜时间,预计藏有苔丝检测到的过境行星的星星的径向速记。因此,应实施调度策略,以最大程度地提高有关目标行星系统收集的信息量。我们考虑了新型统一的附带调度程序的近视和非侧重版本,以及随机调度程序,并将这些调度策略相对于恢复质量和轨道参数的偏见,准确性和准确性比较这些调度策略。该比较是基于对50个苔丝目标恒星样品的浓缩咖啡进行的对径向速度随访的现实模拟进行的,模拟的行星系统包含至少一个透过的行星,半径低于$ 4R _ {\ oplus} $。在合理的假设其噪声成分(包括由恒星活动导致的噪声组件)的合理假设下生成了径向速度数据集,并使用完全贝叶斯方法进行了分析。我们发现随机调度程序会导致对过渡系外行星质量的估计更加有偏见,较少且精确的估计。近视和非侧面调度调度程序的近视和非侧心实现结果之间没有显着差异。每个数据集中只有大约22个径向速度测量值,我们的新型均匀相位调度程序可以对过渡行星的质量进行公正的(在1 \%的水平)测量,同时分别保持平均相对精度和精度分别在16 \%和23 \%。对于所有考虑的计划策略,检测到的非传输行星的数量相似,以及恢复其质量和轨道参数的偏见,准确性和精度。

Radial-velocity follow-up of stars harbouring transiting planets detected by TESS is expected to require very large amounts of expensive telescope time in the next few years. Therefore, scheduling strategies should be implemented to maximize the amount of information gathered about the target planetary systems. We consider myopic and non-myopic versions of a novel uniform-in-phase scheduler, as well as a random scheduler, and compare these scheduling strategies with respect to the bias, accuracy and precision achieved in recovering the mass and orbital parameters of transiting and non-transiting planets. This comparison is carried out based on realistic simulations of radial-velocity follow-up with ESPRESSO of a sample of 50 TESS target stars, with simulated planetary systems containing at least one transiting planet with a radius below $4R_{\oplus}$. Radial-velocity datasets were generated under reasonable assumptions about their noise component, including that resulting from stellar activity, and analysed using a fully Bayesian methodology. We find the random scheduler leads to a more biased, less accurate, and less precise, estimation of the mass of the transiting exoplanets. No significant differences are found between the results of the myopic and non-myopic implementations of the uniform-in-phase scheduler. With only about 22 radial velocity measurements per dataset, our novel uniform-in-phase scheduler enables an unbiased (at the level of 1\%) measurement of the masses of the transiting planets, while keeping the average relative accuracy and precision around 16\% and 23\% respectively. The number of non-transiting planets detected is similar for all the scheduling strategies considered, as well as the bias, accuracy and precision with which their masses and orbital parameters are recovered.

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