EZPADOVA -- A python package that allows you to download PADOVA isochrones directly from their website

This small package provides a direct interface to the PADOVA/PARSEC isochrone webpage (http://stev.oapd.inaf.it/cgi-bin/cmd). It compiles the URL needed to query the website and retrieves the data into a python variable.

This package has been tested on Python 3.9, 3.10, 3.11, 3.12, and 3.13 through the GitHub actions CI.

ℹ️ If you use this package, please use the citation information. Please do not forget also to cite the PARSEC work listed on their website.

New in version 2.0

• Updated the interface to the new PADOVA website (i.e. >=3.8) [minor changes in the form format from 3.7]
• New function get_isochrone does all the slices directly (combines get_Z_isochrones, get_t_isochrones, and get_one_isochrone which are now deprecated.)
• get_isochrone handles ages, log ages, Z, and [M/H] as inputs (see documentation).
• Most of the code has been rewritten to be more robust and easier to maintain. In particular, the parsing of the online form has been improved.
• Many integration tests to keep checking the package interface.
• The output format is now a pandas.DataFrame instead of the internal format. (though previous aliases of columns are no longer available)
• added resample_evolution_phase function to resample the label into a continuous evolution phase instead of discrete labels.
• added interpolate.QuickInterpolator to quickly interpolate isochrones over (logage, MH, evolution phase)
• Documentation has been updated and (hopefully) improved.

Available photometric systems, parameters, and default values: see internal documentation

Installation

Install with pip

pip install git+https://github.com/mfouesneau/ezpadova (--user if you want to install it in your user profile)

Manual installation

download the repository and pip install from it

python git clone https://github.com/mfouesneau/ezpadova cd ezpadova python -m pip install .

Example Usage

Since v2.0, ezpadova combines all queries through a single function, get_isochrones.

The following example queries the Padova service to retrieve a set of isochrones spanning ages and metallicities python import ezpadova import matplotlib.pyplot as plt r = ezpadova.get_isochrones(photsys_file='gaiaEDR3', logage=(6, 10, 0.2), MH=(-2, 1, 0.4))

The following example queries the Padova service to retrieve log(age/yr)-space isochrones at solar metallicity and the Gaia eDR3 photometry. python import ezpadova import matplotlib.pyplot as plt r = ezpadova.get_isochrones(logage=(6, 7, 0.1), MH=(0, 0, 0), photsys_file='gaiaEDR3') plt.scatter(r['logTe'], r['logL'], c=r['logAge'], edgecolor='None') plt.show()