Absolute Flux Calibrations for the Nancy Grace Roman Space Telescope Coronagraph Instrument

Lindsey Payne, Robert T. Zellem, Marie Ygouf, Bruce Macintosh

Submitted on 7 July 2022


The Nancy Grace Roman Space Telescope's (Roman) Coronagraph Instrument is a technology demonstration equipped to achieve flux contrast levels of up to 109. This precision depends upon the quality of observations and their resultant on-sky corrections via an absolute flux calibration (AFC). Our plan utilizes 10 dim and 4 bright standard photometric calibrator stars from Hubble Space Telescope's (HST) CALSPEC catalog to yield a final AFC error of 1.94\% and total observation time of 22 minutes. Percent error accounts for systematic uncertainties (filters, upstream optics, quantum efficiency) in Roman component instrumentation along with shot noise for a signal to noise ratio (SNR) of 500.


Comment: Submitted to SPIE Astronomical Telescopes + Instrumentation 2022

Subject: Astrophysics - Instrumentation and Methods for Astrophysics