A Synthetic Roman Space Telescope High-Latitude Time-Domain Survey:
  Supernovae in the Deep Field
  NASA will launch the Nancy Grace Roman Space Telescope (Roman) in the second
half of this decade, which will allow for a generation-defining measurement of
dark energy through multiple probes, including Type Ia supernovae (SNe Ia). To
improve decisions on survey strategy, we have created the first simulations of
realistic Roman images that include artificial SNe Ia injected as point sources
in the images. Our analysis combines work done on Roman simulations for weak
gravitational lensing studies as well as catalog-level simulations of SN
samples. We have created a time series of images over two years containing
$\sim$ 1,050 SNe Ia, covering a 1 square degree subarea of a planned 5 square
degree deep survey. We have released these images publicly for community use
along with input catalogs of all injected sources. We create secondary products
from these images by generating coadded images and demonstrating recovery of
transient sources using image subtraction. We perform first-use analyses on
these images in order to measure galaxy-detection efficiency, point
source-detection efficiency, and host-galaxy association biases. The simulated
images can be found here:
https://roman.ipac.caltech.edu/sims/SN_Survey_Image_sim.html.
