文章基本信息

标题：Radial-velocity Precision of ESPRESSO Through the Analysis of the Solar Twin HIP 11915
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作者：Yuri Netto ; Diego Lorenzo-Oliveira ; Jorge Meléndez 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2021
卷号：162
期号：4
页码：1-5
DOI：10.3847/1538-3881/ac1bb5
语种：English
出版社：American Institute of Physics
摘要：Different stellar phenomena affect radial velocities (RVs), causing variations large enough to make it difficult to identify planet signals from the stellar variability. RV variations caused by stellar oscillations and granulation can be reduced through some methods, but the impact of rotationally modulated magnetic activity on RV, due to stellar active regions, is harder to correct. New instrumentation promises an improvement in precision of one order of magnitude, from about 1 m s−1 to about 10 cm s−1. In this context, we report our first results from 24 spectroscopic Echelle SPectrograph for Rocky Exoplanets and Stable Spectroscopic Observations (ESPRESSO)/Very-Large Telescope observations of the solar twin star HIP 11915, spread over 60 nights. We used a Gaussian Process approach and found for HIP 11915 a RV residual rms scatter of about 20 cm s−1, representing an upper limit for the performance of ESPRESSO.