Roman CCS White Paper: Measuring Type Ia Supernovae Discovered in the Roman High Latitude Time Domain Survey

astro-ph.IM

/ Authors

Rebekah Hounsell, Dan Scolnic, Dillon Brout, Benjamin Rose, Ori Fox, Masao Sako, Phillip Macias, Bhavin Joshi, Susana Desutua, David Rubin

and 7 more authors

Stefano Casertano, Saul Perlmutter, Greg Aldering, Kaisey Mandel, Megan Sosey, Nao Suzuki, Russell Ryan

/ Abstract

We motivate the cosmological science case of measuring Type Ia supernovae with the Nancy Grace Roman Space Telescope as part of the High Latitude Time Domain Survey. We discuss previously stated requirements for the science, and a baseline survey strategy. We discuss the various areas that must still be optimized and point to the other white papers that consider these topics in detail. Overall, the baseline case should enable an exquisite measurement of dark energy using SNe Ia from z=0.1 to z>2, and further optimization should only strengthen this once-in-a-generation experiment.