Minute-cadence Observations of the LAMOST Fields with the TMTS: I. Methodology of Detecting Short-period Variables and Results from the first-year Survey
Minute-cadence Observations of the LAMOST Fields with the TMTS: I. Methodology of Detecting Short-period Variables and Results from the first-year Survey
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TMTS对LAMOST场的分钟节奏观测：一、检测短期变量的方法和第一年的调查结果
DOI：
10.1093/mnras/stab2812
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发表时间：
2021-09
期刊：
影响因子：
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通讯作者：
Hui Gaobo et al.
中科院分区：
文献类型：
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作者：
Lin Jie;Wang Xiaofeng;Mo Jun;Hui Gaobo et al.
位于中国海洋石油总公司兴隆站的清华大学-马化腾望远镜(TMTS)的视场可达18°2。TMTS从2020年开始对LAMOST天空区域进行监测，每个天空区域的不间断观测平均持续约6小时，节奏约为1分钟。在这里，我们介绍了第一年观测的数据分析和初步科学结果，这些观测覆盖了188个LAMOST板块()。这些观测已经产生了超过490万条不间断的光曲线，每条曲线至少有100个历元。这些光曲线对应于426万个GaIA-DR2源，其中28.5万个源具有LAMOST的多历元光谱。通过用Lomb-Scarger周期图分析这些光曲线，我们确定了3,700多个周期在≈7.5h以下的候选周期变星，主要由食双星和δScuti星组成。这些短周期双星将对双星演化理论和未来空间引力波实验的可能来源提供重要约束。此外，我们还通过在光曲线上搜索快速演化的信号来识别42颗耀斑恒星。来自TMT的密集采样的光曲线使我们能够更好地量化这些耀斑的形状和持续时间。
Tsinghua University-Ma Huateng Telescopes for Survey (TMTS), located at Xinglong Station of NAOC, has a field of view up to 18 deg2. The TMTS has started to monitor the LAMOST sky areas since 2020, with the uninterrupted observations lasting for about 6 h on average for each sky area and a cadence of about 1 min. Here, we introduce the data analysis and preliminary scientific results for the first-year observations, which covered 188 LAMOST plates (). These observations have generated over 4.9 million uninterrupted light curves, with at least 100 epochs for each of them. These light curves correspond to 4.26 millionGaia-DR2 sources, among which 285 thousand sources are found to have multi-epoch spectra from the LAMOST. By analysing these light curves with the Lomb–Scargle periodograms, we identify more than 3700 periodic variable star candidates with periods below ≈7.5 h, primarily consisting of eclipsing binaries and δ Scuti stars. Those short-period binaries will provide important constraints on theories of binary evolution and possible sources for space gravitational wave experiments in the future. Moreover, we also identified 42 flare stars by searching rapidly evolving signals in the light curves. The densely sampled light curves from the TMTS allow us to better quantify the shapes and durations for these flares.
DOI：
10.2307/j.ctvrxk1hs
发表时间：
2019-12
期刊：
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影响因子：
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作者：
Ž. Ivezić;A. Connolly;J. Vanderplas;Alexander Gray
通讯作者：
Ž. Ivezić;A. Connolly;J. Vanderplas;Alexander Gray