Nancy Grace Roman Space Telescope Wide Field Instrument: Grism Saturation Response to Bright Sources during Thermal-Vacuum Testing

@misc{chatur2026nancy,
  title = {{Nancy Grace Roman Space Telescope Wide Field Instrument: Grism Saturation Response to Bright Sources during Thermal-Vacuum Testing}},
  author = {Lipika Chatur and Dana R. Louie and Joshua E. Schlieder and Robert F. Wilson and Evan Bray and Scott Rohrbach},
  howpublished = {arXiv},
  year = {2026},
  month = oct,
  doi = {10.48550/arxiv.2610.08666},
  eprint = {2610.08666},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2610.08666},
  note = {CC BY 4.0},
}

TY  - UNPB
TI  - Nancy Grace Roman Space Telescope Wide Field Instrument: Grism Saturation Response to Bright Sources during Thermal-Vacuum Testing
AU  - Lipika Chatur
AU  - Dana R. Louie
AU  - Joshua E. Schlieder
AU  - Robert F. Wilson
AU  - Evan Bray
AU  - Scott Rohrbach
PY  - 2026
DA  - 2026/10/06
PB  - arXiv
DO  - 10.48550/arxiv.2610.08666
UR  - https://arxiv.org/abs/2610.08666
AB  - The Nancy Grace Roman Space Telescope launched on August 30th, 2026 and is expected to begin its science mission in 2027. Although Roman's core science will focus primarily on faint and distant sources, as a survey telescope, it will also observe many bright sources that can saturate the detector pixels. Our goal is to study the behavior caused by bright sources dispersed through the grism and to assess how detector properties may impact scientific analysis. We analyze detector saturation behavior in Roman's Wide Field Instrument (WFI) using Thermal Vacuum Test 2 (TVAC2) bright-source grism data. When bright sources are dispersed through the grism, we find that the faint and diffuse combined orders cause significant structured stray light. We also find that pixels neighboring saturated pixels continue to exhibit linear growth behavior before reaching saturation limits, in contrast to the non-linearity reported for non-dispersed bright point sources.
ER  -