Variability and transient search in the SUDARE-VOICE field: a new method to extract the light curves
Variability and transient search in the SUDARE-VOICE field: a new method to extract the light curves
复制标题
SUDARE-VOICE 场中的变异性和瞬态搜索：一种提取光变曲线的新方法
DOI：
10.1093/mnras/staa558
复制
发表时间：
2020
影响因子：
4.8
通讯作者：
Ragosta Fabio
中科院分区：
文献类型：
--
作者：
Liu Dezi;Deng Wenqiang;Fan Zuhui;Fu Liping;Covone Giovanni;Vaccari Mattia;Radovich Mario;Capaccioli Massimo;De Cicco Demetra;Grado Aniello;Marchetti Lucia;Napolitano Nicola;Paolillo Maurizio;Pignata Giuliano;Ragosta Fabio
VLT巡天望远镜(VST)对CDFS和ES1现场勘测的光学成像，与SUDARE调查相配合，是一种使用VST对CDFS和ES1现场进行深度光学成像的方法。对CDF场的观测包括大约4.38度/∼26 MAG。在这一领域中，总的空中时间跨度超过4年，分布在四个相邻的子领域。在本文中，我们使用多历元波段的成像数据来测量被检测目标的变化性，并搜索瞬变。我们进行仔细的天体测量和光度定标以及点扩展函数建模。提出了一种测量被测物体光曲线的新方法--差动滑动平均测光法。该方法可以减小不同历元之间的点扩散函数的差异，并抑制背景波动。对光线曲线进行了详细的不确定度分析和去趋势化校正。我们通过视觉观察光照曲线来选择可变的对象，并以有趣的光照曲线呈现一些对象。在我们即将发表的论文中，我们将结合多波段数据对这些目标进行进一步的研究。
The VLT Survey Telescope (VST) Optical Imaging of the CDFS and ES1 Fields Survey, in synergy with the SUDARE survey, is a deep opticalugriimaging of the CDFS and ES1 fields using the VST. The observations for the CDFS field comprise about 4.38 deg2down tor∼ 26 mag. The total on-sky time spans over 4 yr in this field, distributed over four adjacent sub-fields. In this paper, we use the multiepochr-band imaging data to measure the variability of the detected objects and search for transients. We perform careful astrometric and photometric calibrations and point spread function modelling. A new method, referring to as differential running-average photometry, is proposed to measure the light curves of the detected objects. With the method, the difference of PSFs between different epochs can be reduced, and the background fluctuations are also suppressed. Detailed uncertainty analysis and detrending corrections on the light curves are performed. We visually inspect the light curves to select variable objects, and present some objects with interesting light curves. Further investigation of these objects in combination with multiband data will be presented in our forthcoming paper.