[Mesa-users] Difficulty producing models using example_make_pre_ccsn inlists

[Bill Paxton]

Hi Jake,

The next public release will include a completely new test case for making pre_ccsn_IIp models that should be much more robust than what’s out there now (you are not alone in having problems with it).

Until then, your best bet is to find cases that work and use them.

-b




> On Jun 28, 2020, at 2:43 PM, Jake Nicoll via Mesa-users <mesa-users at lists.mesastar.org> wrote:
> 
> 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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