A novel, fully automated pipeline for period estimation in the eros 2 data set

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Abstract

We present a new method to discriminate periodic from nonperiodic irregularly sampled light curves. We introduce a periodic kernel and maximize a similarity measure derived from information theory to estimate the periods and a discriminator factor. We tested the method on a data set containing 100,000 synthetic periodic and nonperiodic light curves with various periods, amplitudes, and shapes generated using a multivariate generative model. We correctly identified periodic and nonperiodic light curves with a completeness of 90% and a precision of 95%, for light curves with a signal-to-noise ratio (S/N) larger than 0.5. We characterize the efficiency and reliability of the model using these synthetic light curves and apply the method on the EROS-2 data set. A crucial consideration is the speed at which the method can be executed. Using a hierarchical search and some simplification on the parameter search, we were able to analyze 32.8 million light curves in 18 hr on a cluster of GPGPUs. Using the sensitivity analysis on the synthetic data set, we infer that 0.42% of the sources in the LMC and 0.61% of the sources in the SMC show periodic behavior. The training set, catalogs, and source code are all available at http://timemachine.iic.harvard.edu.

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Protopapas, P., Huijse, P., Estévez, P. A., Zegers, P., Príncipe, J. C., & Marquette, J. B. (2015). A novel, fully automated pipeline for period estimation in the eros 2 data set. Astrophysical Journal, Supplement Series, 216(2). https://doi.org/10.1088/0067-0049/216/2/25

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