Py Dict Structure of JWST Output

The PandExo output is organized into Python Dictionaries. See example notebooks for an explanation of how to manipulate these and plot the most common outputs. Below is a breakdown of everything contained in the PandExo output dictionary.

FinalSpectrum (contains 4 keys)

  • spectrum_w_rand: Planet spectrum with random noise added in units of (Rp/Rs)2 or (Fp/Fs)

  • spectrum: Planet spectrum with no random noise

  • error_w_floor: Error with user defined noise floor. If no floor was specified, there is no floor.

  • wave: wavelength (microns)

print dict['FinalSpectrum']['spectrum_w_rand']

OriginalInput (contains 2 keys)

  • model_wave: original wavelength input by user

  • model_spec: original spectrum input by user

print dict['OriginalInput']['model_wave']

Warning (contains 6 keys)

  • Num Groups Reset?: Before PandExo simulates in and out of transit observations, it computes a single integration with 2 groups in order to figure out how many additional groups it can add before hitting saturation. If it computes a number less than 2, it resets the number of groups to 2.

  • Group Number Too Low?: Prints out warning if number of groups is less than 5 and the saturation level less than 60%.

  • Group Number Too High?: Prints out warning if number of groups per integration exceeds 65536

  • Saturated?: This is an output directly taken from Pandeia’s “hard saturation” flag. If there are any saturated pixels, it will alert you here. You can also see the saturation profile.

  • Non linear?: This is an output directly taken from Pandeia’s “soft saturation” flag.

  • % full well high?: If you’ve set the saturation level over 80%, it will warn you.

print dict['Warning']['Num Groups Reset?']

PandeiaOutTrans (contains 9 keys)

This is the raw output of Pandeia’s simulation of the out of transit observation. For a complete breakdown of these outputs go to STScI’s Pandeia Documentation.

  • sub_reports

  • information

  • warnings

  • transform

  • 2d

  • scalar

  • 1d

  • input

  • 3d

print dict['PandeiaOutTrans']['information']

RawData (contains 6 keys)

  • var_in: The variance of only the in transit data

  • wave: wavelength vector

  • flux_in: Flux of the in transit data in units of e-/s

  • flux_out: Flux of the out of transit data in units of e-/s

  • error_no_floor: Error without any noise floor

  • var_out: The variance of only the out of transit data

print dict['RawData']['var_in']

Timing (contains 10 keys)

  • Seconds per Frame

  • Number of Transits

  • Observing Efficiency (%) = (num groups - 1)/(num groups + 1)

  • Num Integrations Out of Transit

  • On Source Time

  • Exposure Time Per Integration (secs)

  • Reset time Plus TA time (hrs): Target acquisition time is assumed to be 30 minutes

  • Num Integrations In Transit

  • Num Groups per Integration

  • Num Integrations per Occultation

print dict['Timing']['Seconds per Frame']

Input (contains 10 keys)

  • Target Mag

  • Readmode

  • Disperser

  • Filter

  • Instrument

  • Mode

  • Saturation Level (electons)

  • Aperture

  • Subarray

  • Primary/Secondary

print dict['Input']['Target Mag']

Timing, Warning, and Input Divs (all contain html script)

Here are the html scripts for the three tables that are rendered on the website output page.