New Time-Dependent WFC3/IR Inverse Sensitivities
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866918335393824768 |
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| author | Calamida, Annalisa Marinelli, Mariarosa Bajaj, Varun Pidgeon, Aidan Mack, Jennifer |
| author_facet | Calamida, Annalisa Marinelli, Mariarosa Bajaj, Varun Pidgeon, Aidan Mack, Jennifer |
| contents | We present new time-dependent inverse sensitivities for the WFC3/IR channel. These were calculated using the sensitivity change slopes measured by \citet{2024wfc..rept....6M} and photometry of five CALSPEC standards (the white dwarfs GRW+70~5824, GD~153, GD~71, G191B2B, and the G-type star P330E) collected from 2009 to 2023. The new inverse sensitivities account for losses of 1-2\% over 15 years, depending on wavelength, and provide an internal photometric precision better than 0.5\% for all wide--, medium--, and narrow-band filters. An updated version of \texttt{calwf3} (v3.7.2) has been developed for use with a new time-dependent image photometry table (IMPHTTAB) and will be used to update the image header photometric keywords following MAST reprocessing, expected in late-2024. Alternatively, the new inverse sensitivities may be computed by the user for a specific observation date by running \texttt{stsynphot}. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_12367 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | New Time-Dependent WFC3/IR Inverse Sensitivities Calamida, Annalisa Marinelli, Mariarosa Bajaj, Varun Pidgeon, Aidan Mack, Jennifer Instrumentation and Methods for Astrophysics We present new time-dependent inverse sensitivities for the WFC3/IR channel. These were calculated using the sensitivity change slopes measured by \citet{2024wfc..rept....6M} and photometry of five CALSPEC standards (the white dwarfs GRW+70~5824, GD~153, GD~71, G191B2B, and the G-type star P330E) collected from 2009 to 2023. The new inverse sensitivities account for losses of 1-2\% over 15 years, depending on wavelength, and provide an internal photometric precision better than 0.5\% for all wide--, medium--, and narrow-band filters. An updated version of \texttt{calwf3} (v3.7.2) has been developed for use with a new time-dependent image photometry table (IMPHTTAB) and will be used to update the image header photometric keywords following MAST reprocessing, expected in late-2024. Alternatively, the new inverse sensitivities may be computed by the user for a specific observation date by running \texttt{stsynphot}. |
| title | New Time-Dependent WFC3/IR Inverse Sensitivities |
| topic | Instrumentation and Methods for Astrophysics |
| url | https://arxiv.org/abs/2602.12367 |