ROME/REA: Three-year, Tri-color Timeseries Photometry of the Galactic Bulge

IF 3.3 3区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS
R. A. Street, E. Bachelet, Y. Tsapras, M. P. G. Hundertmark, V. Bozza, D. M. Bramich, A. Cassan, M. Dominik, R. Figuera Jaimes, K. Horne, S. Mao, A. Saha, J. Wambsganss, Weicheng Zang
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引用次数: 0

Abstract

The Robotic Observations of Microlensing Events/Reactive Event Assessment Survey was a Key Project at Las Cumbres Observatory (hereafter LCO) which continuously monitored 20 selected fields (3.76 sq.deg) in the Galactic Bulge throughout their seasonal visibility window over a three-year period, between 2017 March and 2020 March. Observations were made in three optical passbands (SDSS g , r , i ), and LCO’s multi-site telescope network enabled the survey to achieve a typical cadence of ∼10 hr in i and ∼15 hr in g and r . In addition, intervals of higher cadence (<1 hr) data were obtained during monitoring of key microlensing events within the fields. This paper describes the Difference Image Analysis data reduction pipeline developed to process these data, and the process for combining the photometry from LCO’s three observing sites in the Southern Hemisphere. The full timeseries photometry for all ∼8 million stars, down to a limiting magnitude of i ∼ 18 mag is provided in the data release accompanying this paper, and samples of the data are presented for exemplar microlensing events, illustrating how the tri-band data are used to derive constraints on the microlensing source star parameters, a necessary step in determining the physical properties of the lensing object. The timeseries data also enables a wealth of additional science, for example in characterizing long-timescale stellar variability, and a few examples of the data for known variables are presented.
ROME/REA:银河隆起的三年三色时间序列光度测量
微透镜事件机器人观测/反应事件评估调查是拉斯坎布雷斯天文台(Las Cumbres Observatory,以下简称LCO)的一个重点项目,在2017年3月至2020年3月的三年期间,对银河凸起的20个选定场(3.76平方度)在其季节性可见窗口内进行连续监测。观测在三个光学通带(SDSS-g′、-r′、-i′)上进行,LCO的多站点望远镜网络使这次巡天观测在i′和g′及r′上的典型观测周期分别为10小时和15小时。此外,在监测星场内的关键微透镜事件时,还获得了间隔时间更长(1小时)的数据。本文介绍了为处理这些数据而开发的差分图像分析数据还原管道,以及将来自南半球 LCO 三个观测站点的光度测量数据进行合并的过程。本文所附的数据发布稿中提供了所有 800 万颗恒星的全部时间序列光度测量数据,直到 i ∼ 18 等的极限星等,并提供了微透镜事件示例的数据样本,说明如何利用三波段数据来推导微透镜源星参数的约束条件,这是确定透镜天体物理特性的必要步骤。时间序列数据还能提供大量额外的科学数据,例如在描述长时间尺度恒星可变性方面的数据。
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来源期刊
Publications of the Astronomical Society of the Pacific
Publications of the Astronomical Society of the Pacific 地学天文-天文与天体物理
CiteScore
6.70
自引率
5.70%
发文量
103
审稿时长
4-8 weeks
期刊介绍: The Publications of the Astronomical Society of the Pacific (PASP), the technical journal of the Astronomical Society of the Pacific (ASP), has been published regularly since 1889, and is an integral part of the ASP''s mission to advance the science of astronomy and disseminate astronomical information. The journal provides an outlet for astronomical results of a scientific nature and serves to keep readers in touch with current astronomical research. It contains refereed research and instrumentation articles, invited and contributed reviews, tutorials, and dissertation summaries.
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