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nifty-ls: Fast and Accurate Lomb-Scargle Periodograms Using a Non-Uniform FFT

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arxiv 2409.08090 v1 pith:K6Z7Q6IF submitted 2024-09-12 astro-ph.IM

Lehman H. Garrison , Dan Foreman-Mackey , Yu-hsuan Shih , Alex Barnett This is my paper · ORCID
classification astro-ph.IM
keywords nifty-lslomb-scargleaccuratefastastropyevaluationnon-uniformnufft
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We present nifty-ls, a software package for fast and accurate evaluation of the Lomb-Scargle periodogram. nifty-ls leverages the fact that Lomb-Scargle can be computed using a non-uniform FFT (NUFFT), which we evaluate with the Flatiron Institute NUFFT package (finufft). This approach achieves a many-fold speedup over the Press & Rybicki (1989) method as implemented in Astropy and is simultaneously many orders of magnitude more accurate. nifty-ls also supports fast evaluation on GPUs via CUDA and integrates with the Astropy Lomb-Scargle interface. nifty-ls is publicly available as open-source software.

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