文章基本信息

标题：An Information Theory Approach on Deciding Spectroscopic Follow-ups
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作者：Javiera Astudillo ; Pavlos Protopapas ; Karim Pichara 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：159
期号：1
页码：213-226
DOI：10.3847/1538-3881/ab557d
语种：English
出版社：American Institute of Physics
摘要：Classification and characterization of variable phenomena and transient phenomena are critical for astrophysics and cosmology.These objects are commonly studied using photometric time series or spectroscopic data.Given that many ongoing and future surveys are conducted in a time domain, and given that adding spectra provides further insights but requires more observational resources, it would be valuable to know which objects we should prioritize to have a spectrum in addition to a time series.We propose a methodology in a probabilistic setting that determines a priori which objects are worth taking a spectrum of to obtain better insights, where we focus on the insight of the type of the object (classification).Objects for which we query their spectrum are reclassified using their full spectral information.We first train two classifiers, one that uses photometric data and another that uses photometric and spectroscopic data together.Then for each photometric object we estimate the probability of each possible spectrum outcome.We combine these models in various probabilistic frameworks (strategies), which are used to guide the selection of follow-up observations.The best strategy depends on the intended use, whether it is obtaining more confidence or accuracy.For a given number of candidate objects (127, equal to 5% of the data set) for taking spectra, we improve the class prediction accuracy by 37% as opposed to 20% of a non-naive (non-random) best-baseline strategy.Our approach provides a general framework for follow-up strategies and can be extended beyond classification to include other forms of follow-ups beyond spectroscopy.
关键词：Computational methods;Astronomy data analysis;Astrostatistics tools;Variable stars