Ondřejov Echelle Spectrograph, Ground Based Support Facility for Exoplanet Missions

Ondřejov Echelle Spectrograph, Ground Based Support Facility for Exoplanet Missions
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OndÅejov Echelle 摄谱仪,系外行星任务的地面支持设施

DOI:
10.1088/1538-3873/ab6752
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发表时间:
2020
影响因子:
3.5
通讯作者:
Subjak J
Subjak J
中科院分区:
物理与天体物理3区
文献类型:
--
作者:
Kabáth P;Skarka M;Sabotta S;Guenther E;Jones D;Klocová T;Subjak J

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如果没有地面光谱跟踪,实现开普勒和TESS等天基系外行星凌日调查的目标是不可能的。特别是,第一步对候选者的审查可能很容易就需要数百小时的望远镜时间,在这个领域,2米级望远镜可以发挥至关重要的作用。在这里,我们描述的结果,从科学验证的Ondjejov Echelle摄谱仪(OES)安装在2米Perek望远镜。我们讨论的仪器的性能,以及它的适用性研究的系外行星候选人从天基过境调查。尽管OES位于一个普通的欧洲观测站,并且最初被设想用于变星的研究,但它可以被证明是TESS和PLATO时代系外行星社区的重要仪器-达到几十ms− 1的精度,具有合理的采样和信噪比,源低至V <$13。通过对标准星星HD 109358的长期监测,证明了OES的稳定性,同时用3颗K2候选星EPIC 210925707、EPIC 206135267和EPIC 211993818验证了OES的有效性,发现它们都是假阳性探测。
Fulfilling the goals of space-based exoplanetary transit surveys, like Kepler and TESS, is impossible without ground-based spectroscopic follow-up. In particular, the first-step vetting of candidates could easily necessitate several hundreds of hours of telescope time—an area where 2 m class telescopes can play a crucial role. Here, we describe the results from the science verification of the Ondřejov Echelle Spectrograph (OES) installed on the 2 m Perek telescope. We discuss the performance of the instrument as well as its suitability for the study of exoplanetary candidates from space-based transit surveys. In spite of being located at an average European observing site, and originally being conceived for the study of variable stars, OES can prove to be an important instrument for the exoplanetary community in the TESS and PLATO era—reaching accuracies of a few tens of ms− 1 with reasonable sampling and signal-to-noise for sources down to V∼ 13. The stability of OES is demonstrated via long-term monitoring of the standard star HD 109358, while its validity for exoplanetary candidate verification is shown using three K2 candidates EPIC 210925707, EPIC 206135267 and EPIC 211993818, to reveal that they are false positive detections.
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