{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/the-ztf-source-classification-project-ii","title":"The ZTF Source Classification Project: II. Periodicity and variability processing metrics","arxiv_id":"2009.14071","date":"2020-09-29","proceeding":null,"authors":["Michael W. Coughlin","Kevin Burdge","Dmitry A. Duev","Michael L. Katz","Jan van Roestel","Andrew Drake","Matthew J. Graham","Lynne Hillenbrand","Ashish A. Mahabal","Frank J. Masci","Przemek Mróz","Thomas A. Prince","Yuhan Yao","Eric C. Bellm","Rick Burruss","Richard Dekany","Amruta Jaodand","David L. Kaplan","Thomas Kupfer","Russ R. Laher","Reed Riddle","Mickael Rigault","Hector Rodriguez","Ben Rusholme","Jeffry Zolkower"],"abstract":"The current generation of all-sky surveys is rapidly expanding our ability to study variable and transient sources. These surveys, with a variety of sensitivities, cadences, and fields of view, probe many ranges of timescale and magnitude. Data from the Zwicky Transient Facility (ZTF) yields an opportunity to find variables on timescales from minutes to months. In this paper, we present the codebase, ztfperiodic, and the computational metrics employed for the catalogue based on ZTF's Second Data Release. We describe the publicly available, graphical-process-unit optimized period-finding algorithms employed, and highlight the benefit of existing and future graphical-process-unit clusters. We show how generating metrics as input to catalogues of this scale is possible for future ZTF data releases. Further work will be needed for future data from the Vera C. Rubin Observatory's Legacy Survey of Space and Time.","url_abs":"http://arxiv.org/abs/2009.14071v1","url_pdf":"http://arxiv.org/pdf/2009.14071v1.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"the-ztf-source-classification-project-ii","repo_url":"https://github.com/zwickytransientfacility/scope","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":{"status":"ok","spdx":"MIT"}},{"paper_slug":"the-ztf-source-classification-project-ii","repo_url":"https://github.com/zwickytransientfacility/scope-ml","is_official":0,"mentioned_in_paper":0,"mentioned_in_github":1,"framework":"none","reach":{"status":"ok","spdx":"MIT"}}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"atlas_url":"https://app.syntology.ai/?focus=2009.14071","mcp":{"get_harvested_code_for_paper":{"arxiv_id":"2009.14071"}},"developers":"https://syntology.ai/developers","read_at":"2026-09-24T18:15:14+00:00","read_at_is":"when the build read Syntology's graph, not when any sample ran","claim":"Per-sample execution status on synthesized fixtures; not a correctness claim about the paper. 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