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Changelog
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*********
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Changes in main
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===============
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Changes in r24.06.1-rc1
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=======================
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.. note:: This describes changes present in the development version of MESA (``main`` branch) relative to the most recent release.
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.. _Backwards-incompatible changes main:
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Backwards-incompatible changes
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------------------------------
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.. _New Features main:
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.. _New Features r24.06.1-rc1:
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New Features
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------------
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**High Temperature Opacity Tables**
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Type 1 Rosseland-mean opacity tables from The Los Alamos
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OPLIB database (`Colgan et al. 2016 <https://ui.adsabs.harvard.edu/abs/2016ApJ...817..116C/abstract>`_) are now available (Farag et al. 2024).
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OPLIB database (`Colgan et al. 2016 <https://ui.adsabs.harvard.edu/abs/2016ApJ...817..116C/abstract>`_) are now available (`Farag et al. 2024<https://doi.org/10.3847/1538-4357/ad4355>`_).
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These tables cover the region :math:`0.0\leq X \leq1-Z` and
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:math:`0.0\leq Z \leq0.2`. Each set of OPLIB
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opacity tables contains 1194 individual tables, a
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:ref:`kap/defaults:kap_file_prefix` for more details on the
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implementation of these tables. For further details on these new OPLIB opacity tables, a direct comparison with
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the Type 1 OPAL/OP tables as well as their effect on solar models can be found in
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in Farag et al. 2024.
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in `Farag et al. 2024<https://doi.org/10.3847/1538-4357/ad4355>`_.
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**Low Temperature Opacity Tables**
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**Opacity interpolation**
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We have updated the opacity interpolation scheme to provide much higher quality derivatives when doing cubic interpolation
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in composition.
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We have updated the opacity interpolation scheme to provide much higher quality derivatives when doing cubic interpolation in composition.
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MESA interpolates across opacity tables in the :math:`X–Z` plane through the use of two consequtive 1D splines.
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MESA interpolates across opacity tables in the :math:`X–Z` plane through the use of two consecutive 1D splines.
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MESA offers users the ability to choose linear or cubic interpolation for these splines,
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while leaving the default as linear interpolation::
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For this MESA release, linear interpolation remains the default method for interpolating in composition between opacity tables
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while we continue to investigate the residual areas where cubic interpolation appears to occasionally produce lower quality derivatives.
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However, adopting cubic interpolation has been shown to consistently increase the overall
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opacity of a model, and can directly effect the structure of solar models, see Appendix B & C in Farag et al. 2024.
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opacity of a model, and can directly effect the structure of solar models, see Appendix B & C in `Farag et al. 2024<https://doi.org/10.3847/1538-4357/ad4355>`_.
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We anticipate making cubic interpolation the default in a future MESA release version.
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We encourage users to experiment with these different opacity interpolation routines and be mindful of the effect they can have on their stellar models.
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Chem
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~~~~~
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~~~~
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New initial metal mass fractions ``initial_zfracs`` taken from photospheric estimates of the solar heavy element abundances in (AAG21, Asplund et al. 2021) and (MB22, Magg et al. 2022)
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are now available. See :ref:`reference/star_job:initial_zfracs` for more details.
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.. _Bug Fixes main:
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.. _Bug Fixes r24.06.1-rc1:
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Bug Fixes
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---------
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There has been a bug present in the rates module due to the incorrect
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phase space factors for reverse reaction rates involving greater than 2 reactants or
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products. This bug resulted in inconsistent equillibrium compositions when the network
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evolves into nuclear statistical equillibrium (NSE), at temperatures exceeding 4 GK.
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products. This bug resulted in inconsistent equilibrium compositions when the network
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evolves into nuclear statistical equilibrium (NSE), at temperatures exceeding 4 GK.
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This bug effects users who evolve models into NSE using large reaction networks. This
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includes evolving massive stars to core-collapse. Smaller networks such as the ``approx21``
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networks are less affected. We strongly recommend that users update to the latest MESA release.
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