Roman CCS White Paper: Optimizing the HLTDS Cadence at Fixed Depth

Ben Rose; Dan Scolnic; David Rubin; Greg Aldering; Masao Sako; Rebekah Hounsell; Saul Perlmutter

Roman CCS White Paper: Optimizing the HLTDS Cadence at Fixed Depth

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arxiv 2306.17222 v1 pith:FRHGAJEL submitted 2023-06-29 astro-ph.IM astro-ph.CO

David Rubin , Ben Rose , Rebekah Hounsell , Masao Sako , Greg Aldering , Dan Scolnic , Saul Perlmutter This is my paper · ORCID

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The current proposal for the High Latitude Time Domain Survey (HLTDS) is two tiers (wide and deep) of multi-band imaging and prism spectroscopy with a cadence of five days (Rose et al., 2021). The five-day cadence is motivated by the desire to measure mid-redshift SNe where time dilation is modest as well as to better photometrically characterize the transients detected. This white paper does not provide a conclusion as to the best cadence for the HLTDS. Rather, it collects a set of considerations that should be used for a careful study of cadence by a future committee optimizing the Roman survey. This study should optimize the HLTDS for both SN Ia cosmology and other transient science.

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Fishing for the Optimal Roman High Latitude Time Domain Survey: Cosmological Constraints for 1,000 Possible Surveys
astro-ph.CO 2025-06 accept novelty 5.0 of 10

A Fisher-matrix study of 1,000 Roman HLTDS designs finds that roughly 20% prism, 30-40% wide imaging, and the rest deep imaging is the most promising allocation, and releases covariance matrices.

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