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sebastian-zieba / PACMAN

PACMAN is a pipeline to reduce and analyze data collected by Hubble Wide Field Camera 3 (HST/WFC3) using either the G102 or G141 grism.
https://pacmandocs.readthedocs.io
MIT License
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Fixing limb darkening coefficients #19

Open gapp-c opened 1 year ago

gapp-c commented 1 year ago

I see that there are two limb darkening parameters (u1, u2) in the fit_par file and the option _fixld in the pcf. Thus, to fix the LD parameters, one could either fix their values to given numbers in the fit_par file or use model results from exotic-LD for them using the pcf. When I state in both files that I want to fix them, which values have priority?

sebastian-zieba commented 1 year ago

Yeah, fixing the limb-darkening (LD) values in PACMAN based on an exotic-ld run hasn't been tested thoroughly yet. If you want to use a literature value for the LD parameter(s) I would just set it in the fit_par.

I agree that "fix_ld" is a confusing name for a parameter. It should be rather called "use_ld_file" because it should eventually set if the user wants to use the precalculated LD values in the ld_file or not.