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Type Ia Supernova Cosmology with the first two years of Roman Data
Program ID 19092
Science Category Large Scale Structure of the Universe
Program Type Analysis
Category Large
Principal Investigator Rebekah Hounsell
PI Institution University of Maryland, Baltimore County
Co-Investigators
  • Benjamin Rose (Baylor University )
  • Masao Sako (University of Pennsylvania)
  • Richard Kessler (University of Chicago)
  • Ava Bailey (Baylor University )
  • Jillian Paulin (University of Pennsylvania)
  • David Rubin (University of Hawai'i at Mānoa)
  • Lauren Aldoroty (University of Maryland, Baltimore County)
  • Patrick Kelly (University of Minnesota)
  • Thushara Perera (University of Maryland, Baltimore County)
  • Cole Meldorf (University of Pennsylvania)
  • Russell Ryan (Space Telescope Science Institute / STScI)
  • Nao Suzuki (Florida State University)
  • Rebecca Chen (Stanford University)
  • Ann Isaacs (University of Minnesota)
  • Massimo Griggio (Space Telescope Science Institute / STScI)
  • Michael Wood-Vasey (University of Pittsburgh)
  • James DerKacy (Space Telescope Science Institute / STScI)
  • Maria Acevedo (Duke University)
  • Daniel Scolnic (Duke University)
  • Andrew Fruchter (Space Telescope Science Institute / STScI)
  • Justin Pierel (Space Telescope Science Institute / STScI)
  • Saul Perlmutter (University of California, Berkeley)
Abstract The Nancy Grace Roman Space Telescope’s (Roman) High Latitude Time Domain Survey (HLTDS) will conduct a monumental space-based survey focused on Type Ia Supernovae (SNe Ia). Roman’s combination of its wide field of view, wavelength coverage, and observational depth will produce the most comprehensive and high-quality SN Ia dataset of this generation, with ~10,000 SNe Ia satisfying a rigorous cosmology-analysis selection. This Roman sample will cover a significantly extended redshift range (z ~2.5) that vastly improves wa sensitivity compared to previous SN Ia samples. Our proposal aims to combine the publicly available DES-SN5YR sample, consisting of spectroscopically-confirmed low-redshift and photometrically classified DES events, with the first two years of HLTDS data, to (i) deliver the first Roman SN Ia cosmological results with significantly increased w0-wa sensitivity, and (ii) lay the groundwork for analyzing the full Roman SN Ia sample.