[Mesa-users] Difficulty producing models using example_make_pre_ccsn inlists

[Jake Nicoll]

Hi all,

I am using the example_make_pre_ccsn and example_ccsn_IIp test suites in the 12778 version of mesa (with the SDK released on March 1, 2020) in order to model SNe light curves. I think I am having more problems than I would expect to have in generating models using the example_make_pre_ccsn test suite inlists.

For example, I ran the example_make_pre_ccsn inlists for a star of 14 solar masses with omega/omega_crit = 0.2, Z=Z_base=0.02, and eta_wind=1.0. The inlist_common where I set these parameters is attached. All other parameters are left as the defaults. I receive the following error while running inlist_to_si_burn:

stopping because of problems dt < min_timestep_limit

I have tried lowering the minimum time step by several orders of magnitude, which does not fix the problem.

However, these input parameters were used by Ricks and Dwarkadas to produce a model for the 1999em SN. They used the 10398 version of the code, so I ran the same input parameters in the 10398 version (using the 10398 SDK released August 22, 2018) and successfully produced a model.

I am not sure what changed in the code that is now causing this dt error. One obvious change is that there was no inlist_to_si_burn in the 10398 version's example_make_pre_ccsn. This inlist saves a model once the core reaches a si28 mass fraction of 0.4. (I think) I should expect this mass fraction to be achieved by a star with the initial mass I am considering, so I am not sure why this inlist fails to produce a model.

Best,
-Jake Nicoll
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