Phase curve temporal model

This model parametrises a PhaseCurve time model, i.e. with a template phasogram and timing parameters

import astropy.units as u
from astropy.time import Time
from gammapy.modeling.models import (
    Models,
    PowerLawSpectralModel,
    SkyModel,
    TemplatePhaseCurveTemporalModel,
)

path = "$GAMMAPY_DATA/tests/phasecurve_LSI_DC.fits"
t_ref = 43366.275 * u.d
f0 = 1.0 / (26.7 * u.d)

phase_model = TemplatePhaseCurveTemporalModel.read(path, t_ref, 0.0, f0)
time_range = [Time("59100", format="mjd"), Time("59200", format="mjd")]

phase_model.plot(time_range, n_points=400)

<AxesSubplot:xlabel='Time [iso]', ylabel='Norm / A.U.'>

YAML representation

Here is an example YAML file using the model:

model = SkyModel(
    spectral_model=PowerLawSpectralModel(),
    temporal_model=phase_model,
    name="phase_curve_model",
)
models = Models([model])

print(models.to_yaml())

components:
-   name: phase_curve_model
    type: SkyModel
    spectral:
        type: PowerLawSpectralModel
        parameters:
        -   name: index
            value: 2.0
        -   name: amplitude
            value: 1.0e-12
            unit: cm-2 s-1 TeV-1
        -   name: reference
            value: 1.0
            unit: TeV
    temporal:
        type: TemplatePhaseCurveTemporalModel
        parameters:
        -   name: t_ref
            value: 43366.275
            unit: d
        -   name: phi_ref
            value: 0.0
        -   name: f0
            value: 0.03745318352059925
            unit: d-1
        -   name: f1
            value: 0.0
            unit: s-2
        -   name: f2
            value: 0.0
            unit: s-3
        filename: /Users/terrier/Code/gammapy-dev/gammapy-data/tests/phasecurve_LSI_DC.fits