Automated transient identification in the Dark Energy Survey

Goldstein, D. A.

doi:10.1088/0004-6256/150/3/82

Title: Automated transient identification in the Dark Energy Survey

Journal Article · Thu Aug 20 00:00:00 EDT 2015 · The Astronomical Journal (Online)

DOI:https://doi.org/10.1088/0004-6256/150/3/82· OSTI ID:1212752

Goldstein, D. A. ^[1]

Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). et al.

We describe an algorithm for identifying point-source transients and moving objects on reference-subtracted optical images containing artifacts of processing and instrumentation. The algorithm makes use of the supervised machine learning technique known as Random Forest. We present results from its use in the Dark Energy Survey Supernova program (DES-SN), where it was trained using a sample of 898,963 signal and background events generated by the transient detection pipeline. After reprocessing the data collected during the first DES-SN observing season (2013 September through 2014 February) using the algorithm, the number of transient candidates eligible for human scanning decreased by a factor of 13.4, while only 1.0 percent of the artificial Type Ia supernovae (SNe) injected into search images to monitor survey efficiency were lost, most of which were very faint events. Here we characterize the algorithm's performance in detail, and we discuss how it can inform pipeline design decisions for future time-domain imaging surveys, such as the Large Synoptic Survey Telescope and the Zwicky Transient Facility.

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Research Organization:: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: DES

DOE Contract Number:: AC02-07CH11359

OSTI ID:: 1212752

Report Number(s):: FERMILAB-PUB-15-141-AE; arXiv eprint number arXiv:1504.02936

Journal Information:: The Astronomical Journal (Online), Vol. 150, Issue 3; ISSN 1538-3881

Country of Publication:: United States

Language:: English

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