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arXiv · 2509.18544

phrosty: A difference imaging pipeline for Roman

Lauren Aldoroty·Lei Hu·Rob Knop·Cole Meldorf·Daniel Scolnic·Shu Liu·W. Michael Wood-Vasey·Marcus Manos·Lucas Erlandson·Rebekah Hounsell·Ben Rose·Masao Sako·Michael Troxel·The Roman Supernova Cosmology Project Infrastructure Team
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Abstract

NASA's Nancy Grace Roman Space Telescope (Roman) will provide an opportunity to study dark energy with unprecedented precision using several techniques, including measurements of Type Ia Supernovae (SNe Ia). Here, we present `phrosty` (PHotometry for ROman with SFFT for tYpe Ia supernovae): a difference imaging pipeline for measuring the brightness of transient point sources in the sky, primarily SNe Ia, using Roman data. `phrosty` is written in Python. We implement a GPU-accelerated version of the Saccadic Fast Fourier Transform (SFFT) method for difference imaging.

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Lauren Aldoroty, Lei Hu, Rob Knop, Cole Meldorf, Daniel Scolnic, Shu Liu, W. Michael Wood-Vasey, Marcus Manos, Lucas Erlandson, Rebekah Hounsell, Ben Rose, Masao Sako, Michael Troxel, The Roman Supernova Cosmology Project Infrastructure Team. 2025-09-23. phrosty: A difference imaging pipeline for Roman. https://arxiv.org/abs/2509.18544

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