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The next generation exposure time calculator for JWST Recommendations and science concept

The next generation exposure time calculator for JWST Recommendations and science concept. The MESA ETC WG: Elizabeth Barker (coordinator), Klaus Pontoppidan, Mike Regan, Diane Karakla , Christine Chen, Jen Lotz , Massimo Robberto , Andre Martel, Vicki Laidler , Chris Hanley.

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The next generation exposure time calculator for JWST Recommendations and science concept

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  1. The next generation exposure time calculator for JWSTRecommendations and science concept The MESA ETC WG: Elizabeth Barker (coordinator), Klaus Pontoppidan, Mike Regan, Diane Karakla, Christine Chen, Jen Lotz, Massimo Robberto, Andre Martel, Vicki Laidler, Chris Hanley

  2. We are required to support all JWST modes. (S&OC level 3) NIRCAM NIRSPEC MIRI NIRISS FGS • Imaging • Lyotcoronagraphy • 4QPM coronagraphy • Medium resolution IFU • Low-resolution single object • Target Acq • Imaging • Wide-field slitless spectroscopy • Single-object slitless spectroscopy • Aperture masking • Target Acq • Guiding • Calibration • Imaging • Coronagraphy • Target Acq • MOS PRISM • MOS R=1000 • MOS R=2700 • IFU PRISM • IFU R=1000 • IFU R=2700 • Fixed slit • Target Acq

  3. TBD ETC development is a close collaboration between the ETCWG and the SSB. Detailed test implementation “Scamp” Production ETC WIT ETCWG SSB Level 5 Requirements (how) “blue sky” concept ETCWG Recommendation Level 4 Requirements (what)

  4. The ETC should use a three-dimensional (two spatial and one spectral) framework. Recommendation

  5. The ETC should use a grid of reference PSFs, for instance as generated by the WebbPSF tool. Recommendation

  6. A 3D ETC enables support for all JWST observing modes. A few arcsec Y Wavelength X

  7. The noise propagation should include correlated noise. Recommendation

  8. The ETC models correlated detector noise. Total flux rate in measurement Flux rate in pixel i scalar weight of pixel i Variance of measurement covariance matrix of pixels (1,2,...,N)

  9. Example: Aperture photometry A = extraction region/aperture B = sky region Aperture correction Pixel flux rate in aperture Pixel flux rate in background Pixel weights Negative because the background is subtracted

  10. The ETC requires 3 classes of input. Input 1 Input 3 Input 2

  11. The ETC engine may have to support several clients. APT Web applet/form Stand-alone app ETC engine A python library

  12. The ETC engine should have a stable API, capable of supporting different clients, including APT, a user web form and a standalone graphical application. Recommendation

  13. https://confluence.stsci.edu/display/JWST/MESA+ETC

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