[Mesa-users] Trying to model a possible progenitor for type Ib Supernova

[Amar Aryan]

Hi, 
Using mesa version-11701, I am trying to model a possible progenitor for a type Ib supernova (SN). For this purpose, I am evolving a 12 solar mass zero-age main-sequence star, considering initial metallicity (Z) of 0.02. After evolving the model until the exhaustion of helium, I am imposing an artificial mass-loss rate of 10^(-4) solar masses per year until the total hydrogen mass of the star goes down to 0.01 solar masses. After the hydrogen mass reaches the specified limit, I switch off the artificial mass loss and evolve the model until the onset of core-collapse. For this purpose, I have used example_make_pre_ccsn directory of test_suit with some changes in the inlist files and in rn executable. I am attaching here my entire working directory. The evolution starts smoothly but terminates by giving the following errors : 

dt 3.1322685072350174D-13 
min_timestep_limit 9.9999999999999998D-13 

stopping because of problems dt < min_timestep_limit 


I have tried a few solutions myself : 

a) Varied min_timestep_limit in inlist_massive_default in the range (10^-6 to 10^-14), but these did not work, still got same error. 
b) Then tried with changing varcontrol_target in the range (10^-2 to 10^-5) with different min_timestep_limit, but still, we get the same error. 

I am looking for your guidance and suggestions. 
Thank you in advance for any suggestions. 

Regards, 
Amar. 



















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