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      High-Precision Redshifts for Type Ia Supernovae with the Nancy Grace Roman Space Telescope P127 Prism

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          Abstract

          We present results from simulating slitless spectroscopic observations with the Nancy Grace Roman Space Telescope's (Roman) Wide-Field Instrument (WFI) P127 prism spanning 0.75 \(\mu m\) to 1.8 \(\mu m\). We quantify the efficiency of recovered Type Ia supernovae (SNe Ia) redshifts, as a function of P127 prism exposure time, to guide planning for future observing programs with the Roman prism. Generating the two-dimensional dispersed images and extracting one-dimensional spectra is done with the slitless spectroscopy package pyLINEAR along with custom-written software. From the analysis of 1698 simulated SN Ia P127 prism spectra, we show the efficiency of recovering SN redshifts to \(z\lesssim3.0\), highlighting the exceptional sensitivity of the Roman P127 prism. Redshift recovery is assessed by setting a requirement of \(\sigma_z = (\left|z - z_\mathrm{true} \right|)/(1+z) \leq 0.01\). We find that 3 hr exposures are sufficient for meeting this requirement, for \(\gtrsim 50\%\) of the sample of mock SNe Ia at \(z\approx2\) and within \(\pm5\) days of rest-frame maximum light in the optical. We also show that a 1 hr integration of Roman can achieve the same precision in completeness to a depth of \(24.4 \pm 0.06\) AB mag (or \(z\lesssim 1\)). Implications for cosmological studies with Roman P127 prism spectra of SNe Ia are also discussed.

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          Author and article information

          Journal
          25 May 2022
          Article
          2205.12949
          d500266e-c683-4578-90ff-e5cfc4bf64be

          http://creativecommons.org/licenses/by/4.0/

          Custom metadata
          17 pages, 10 figures. Submitted to AAS journals. Comments welcome
          astro-ph.GA

          Galaxy astrophysics
          Galaxy astrophysics

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