Page History

Giovanna GiardinoStephan Birkman

Stephan

• Had to divide by white light curve to remove brightness variations
• Two main sources of systematic noise
  
  • 1/f noise from detector electronics
  • Flux variations from drift/jitter
• NIRSpec should reach 200 ppm noise floor in <5 min of integration

•  Real CV3 data available (see presentation)
• Typical file size ~ 4 GB
• Max file size ~ 20 GB
• Median of "out-of-trace" pixels per column removes detector 1/f noise

• Jarron is simulating TSO data
• Spectral BG subtraction should be "column-by-column" (cross-dispersion direction), but cannot cross strip boundaries
• Image BG subtraction likely an annulus
• Typical file size ~ 13 GB
• Max file size ~ 173 GB
• Jonathan Fraine will be PoC

• Have simulations for 6 different exoplanet systems
  • Source code
  • working on documentation, adding 1/f noise, etc
• Typical file size ~ 2 GB
• Max file size ~ 24 GB
• Recommend “column-by-column” (in the cross-dispersion direction)
• See slide below for 1/f subtraction

• Slitless LRS integrated into MIRI Simulator, currently testing
• Typical file size ~ 10.4 GB
• Max file size ~ 45 GB
• Ongoing discussion about BG subtraction
  • no subtraction may work
  • off-source BG exposure seems prudent
  • Not sure if "column-by-column" (in the cross-dispersion direction) will work

• What data products would be needed for simulated data? What level?
• What's the schedule for providing simulated data?
• Does the simulated data need to have proper headers? If so, what are the constraints?
• Suggested that 1/f noise subtraction should be separate from the BG subtraction
• Integrating BG subtraction into 1D spectral extraction should be fine