P-winds

p-winds` is a Python implementation of Parker wind models for planetary atmospheres.

New in the 0.5.3-beta version:

- Fixed a bug that could yield negative integration values using the Simpson's rule of `scipy`.

p-winds` is a Python implementation of Parker wind models for planetary atmospheres.

New in the 0.5-beta version:

Transit simulation
Radiative transfer to calculate the in-transit signal of the Helium triplet in 1.083 microns

New in the 0.5.2-beta version:
Added the necessary configuration to allow `conda-forge` and Travis CI routines

p-winds` is a Python implementation of Parker wind models for planetary atmospheres.

New in the 0.5-beta version:
- Transit simulation
- Radiative transfer to calculate the in-transit signal of the Helium triplet in 1.083 microns

In this new alpha version, the way the helium profile is calculated changed quite a bit. Now, `helium.py` takes as input the structure of the upper atmosphere calculated in prior with `hydrogen.py` or any other atmospheric escape calculation. This is important to make `helium.py` independent of the Parker modeling.

This is the final alpha release, where the steady-state population of helium was implemented. The next release will either be important patches and eventually the beta version.

This patch corrects two major issues with the code:
1) The velocities beyond the sonic point are now consistent with a planetary outflow (previously, it was consistent with an accretion flow beyond the sonic radius).
2) The calculation of the sound speed now allows the user to set an ionization fraction, which in turn changes the mean molecular weight of the atmosphere.