[Mesa-users] The evolution after log T_c > 9.85 for presupernova

[辛文宇]

Hi,




Thanks for your suggestions. I will try the newer version as you mentioned.




Wenyu



-----原始邮件-----
发件人:"Rob Farmer" <robert.j.farmer37 at gmail.com>
发送时间:2022-10-04 19:52:01 (星期二)
收件人: "辛文宇" <wyxin at nao.cas.cn>
抄送: mesa-users at lists.mesastar.org, "xinwenyu16 at mails.ucas.ac.cn" <xinwenyu16 at mails.ucas.ac.cn>
主题: Re: [Mesa-users] The evolution after log T_c > 9.85 for presupernova


Hi,


>  With nuclear burning, why "inlist_finish" and "inlist_to_lgT_9.9" show such large differences?



Look for the other differences between the inlists. These are not solving the same structure equations


>How the following evolution is treated differently in "inlist_finish"?


inlist_finish is preparing the model to be exploded. By turning off the nuclear burning the star will more easily collapse, making it computational quicker.



 >  All these three lines seems strange, so how we treat the evolution before pre-SN in MESA.


These are test cases, we use them to make sure MESA is working and to demonstrate what MESA can do. However it is up to the user to determine whether the model matches reality and to do tests like you have done to see what happens when inlist options are altered. The test suite options are not optimally chosen for any model and need modification by the user before use.



You could just use a newer version of MESA that can better handle pre-supernovae evolution. MESA r22.05.1 test case 20MS_pre_ms_to_core_collapse gets to core collapse without needing to turn off the nuclear burning.


Rob

 



On Tue, 4 Oct 2022 at 12:49, 辛文宇 via Mesa-users <mesa-users at lists.mesastar.org> wrote:


Hi,




I've calculated the evolution of presupernova from ZAMS with mesa-r12778.

The calculation with  "inlist_to_lgT_9.9" stop at log T_c = 9.85, then "inlist_finish"

is used for the folowing evolution. The evolution in T-Rho diagram (final_trho.pdf)

is the black line.

I noticed that these two:

eps_nuc_factor = 0d0

dxdt_nuc_factor = 0d0

are used in inlist_finish. The nuclear burning is turn off artificially. Thus I uncomment

those and trun on the nuclear burning. The evolution becomes the green line in final_trho.pdf.

It seems strange. I also try to remove the "inlist_finish" and continue the following evolution 

with "inlist_to_lgT_9.9", which is red line in the final_trho.pdf.

The Kippenhahn diagram of green and  red line are also attached.

Here are questions. 

With nuclear burning, why "inlist_finish" and "inlist_to_lgT_9.9" show such large differences?

How the following evolution is treated differently in "inlist_finish"?

All these three lines seems strange, so how we treat the evolution before pre-SN in MESA.




Thanks,

Wenyu










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