text: DEFAULT_SYSTEM = {
      "system": {
          "inclination": None,
          "period": None,
          "argument_of_periastron": 0.0,
          "gamma": 0.0,
          "eccentricity": 0.0,
          "primary_minimum_time": 0.0,
          "phase_shift": 0.0,
          "semi_major_axis": None,  # default unit is solRad
          "mass_ratio": None
      },
      "primary": {
          "surface_potential": None,
          "synchronicity": 1.0,
          "t_eff": None,  # parameters can be provided in string representation consistent with astropy unit format
          "metallicity": 0.0
      },
      "secondary": {
          "surface_potential": None,
          "synchronicity": 1.0,
          "t_eff": None,
          "metallicity": 0.0
      }
  }