Zodipy is a python tool that simulates the Zodiacal emission.
Project description
Zodipy is a Python tool for simulating the Interplanetary Dust Emission that a Solar System observer sees, either in the form of timestreams or binned HEALPIX maps.
Usage
A full introduction to Zodipy and its use-cases can be found in the documentation.
Interplanetary Dust models: select between built in models.
from zodipy import Zodipy
model = Zodipy(model="DIRBE") # DIRBE
model = Zodipy(model="Planck18") # Planck 2018
Get emission from a point on the sky: choose a frequency/wavelength, an observer, a time of observation, and angular coordinates (co-latitude, longitude).
import astropy.units as u
from astropy.time import Time
model.get_emission(
25*u.micron,
obs="earth",
obs_time=Time.now(),
theta=10*u.deg,
phi=40*u.deg,
)
>> <Quantity [16.65684599] MJy / sr>
Get emission from a sequence of angular coordinates: theta
and phi
can be a sequence of angles that can represent some time-ordered pointing.
theta = [10.1, 10.5, 11.1, 11.5] * u.deg # Longitude
phi = [40.2, 39.9, 39.8, 41.3] * u.deg # Latitude
model.get_emission(
25*u.micron,
obs="earth",
obs_time=Time.now(),
theta=theta,
phi=phi,
lonlat=True,
)
>> <Quantity [29.11106315, 29.33735654, 29.41248579, 28.30858417] MJy / sr>
Get emission from pixel indices on a HEALPIX grid: a sequence of pixel indicies along with an NSIDE parameter can be used.
model.get_emission(
25*u.micron,
obs="earth",
obs_time=Time.now(),
pixels=[24654, 12937, 26135],
nside=128,
)
>> <Quantity [17.77385144, 19.7889428 , 22.44797121] MJy / sr>
Get binned emission component-wise: the emission can be binned to a HEALPIX map, and also returned component-wise.
import healpy as hp
import numpy as np
nside = 128
model.get_emission(
25*u.micron,
obs="earth",
obs_time=Time.now(),
pixels=np.arange(hp.nside2npix(nside)),
nside=nside,
binned=True,
return_comps=True
).shape
>> (6, 196608)
Documentation
A detailed introduction along with a tutorial of how to use Zodipy will shortly be available in the documentation.
Installing
Zodipy is available on PyPI and can be installed with pip install zodipy
(Python >= 3.8 required).
Scientific paper
- San et al. (2022). Zodipy: software for simulating Interplanetary Dust Emission. Manuscript in preparation.
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