zodipy 0.5.6

Zodipy is a python tool that simulates the Zodiacal emission.

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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

See the documentation for a broader introduction to using Zodipy.

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 Zodiacal Emission. Manuscript in preparation.