[Mesa-users] PPISN module timestep issues

[Vaishnav Rao]

Hello all,

We have been trying to run the PPISN module to get the final BH masses, and He depletion mass for initial masses 40-90M in steps of 2M. We have not made any changes to the default run_star_extras.f file in the test suite, but have made a few changes to the inlist_ppisn file. We changed most of the settings to recommended values (except mesh_delta_coeff which we set as 0.5), and added a few lines from the inlist_ppisn module from the source code of the “Mind the Gap” paper, which were compatible with the r12778 version. 40-64M ran until Fe core collapse. But, 66-90M were very slow to converge and hadn’t even reached He burning (as was apparent from the star age and negligible drop in star mass) even after >100,000 models. 

We then tried implementing some fixes as suggested by some previous mail threads. Specifically, we changed the convective overshoot controls and max_dq. We also added and removed pre_ms_T_c but to no avail. We are attaching the inlist_ppisn file and the run_star_extras.f files. 

MESA version: r12778
SDK version: March 25, 2020
OS: Cluster, 64-bit Linux 

Any help with resolving this issue will be greatly appreciated.

Thank you,
Vaishnav V. Rao, Harshda Saxena
3rd Year Physics Undergraduates,
IIT Bombay, India



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