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PSF photometry for BRITE* nano-satellite mission

机译:PSF光度法用于BRITE *纳米卫星任务

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The BRIght Target Explorer (BRITE) is a space mission consisting of five nano-satellites aimed at the observations of microvariability of the brightest stars. Since the end of 2013, this ongoing mission has provided photometric data for nearly 500 bright stars in the sky. Taking the advantage of currently employed chopping mode of observing, a new PSF-fitting based photometric pipeline was developed for the BRJTE data. The motivation for a new procedure was the expected increase of photometric precision for the dimmest objects. The proposed new method uses the principal component analysis (PCA) decomposition of stellar profile into a set of eigen-PSFs, which allows for adaptive fitting to PSFs modulated either by the blurring or by the variations of the intra-pixel sensitivity. The first results of the new pipeline confirm its good performance: for faint stars the PSF photometry results in a smaller scatter than the current photometry, while for the brightest stars the results from both pipelines are comparable. The superiority of a novel technique is evident for the most degraded sensors which makes the proposed pipeline a promising solution for the next years of the mission.
机译:靶目标探测器(BRITE)是一项由五颗纳米卫星组成的太空任务,旨在观测最亮恒星的微变率。自2013年底以来,这项正在进行的任务为天空中近500个明亮的恒星提供了光度数据。利用当前采用的斩波模式的优势,针对BRJTE数据开发了一种基于PSF拟合的新光度管道。采取新程序的动机是期望增加最暗物体的光度测量精度。提出的新方法将恒星轮廓的主成分分析(PCA)分解为一组特征PSF,从而可以自适应拟合通过模糊或像素内灵敏度变化而调制的PSF。新管道的第一个结果证实了其良好的性能:对于微弱的恒星,PSF光度法产生的散射比当前的光度法小,而对于最亮的恒星,两个管道的结果可比。对于降解最严重的传感器,新技术的优越性显而易见,这使得拟议中的管道成为未来几年任务的有希望的解决方案。

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