[Mesa-users] Problems with mass_semiconv_core

[Isaac Malsky]

Hi,

I was wondering if anyone had experience with the parameter for
"mass_semiconv_core". I'm running Neptune-mass exoplanets, and during an
evolution inlist the mass of the core drops from some significant value
(approximately 5e-5) to 0. There's a corresponding drop in the radius of
the planet, which seems so abrupt that I don't think it could be physical.
I'd appreciate any advice on how to slowly decrease the convective core
mass, so as to make the radius change more gradual, or if this is
suggestive of a different problem that I'm not thinking of.

The only unique processes going on are irradiation from the standard
set_column_depth routine, and chemical abundance changes corresponding to
helium/hydrogen loss that I've specified.

Thanks,
Isaac
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