[Mesa-users] WD + WD merger simulation

[Ebraheem Farag]

Hello Amar, Happy New Year!

Can you share a little more of your terminal output preceding "terminated
evolution: cannot find acceptable model"?

-EbF

On Mon, Jan 8, 2024 at 12:15 AM Amar Aryan via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> Dear MESA users,
>
> I wish you all a very happy, prosperous, and productive new year! On that
> note, I am trying to perform the simulation of a binary white dwarf merger
> event (WD1 + WD2). I followed the below-mentioned steps to start with:
>
> 1) I build two WDs using the *make_he_wd *directory with the desired
> final radii and temperatures. The final_wd1.mod and final_wd2.mod files
> were produced for WD1 and WD2, respectively.
>
> 2) I utilized the *final_wd1.mod *and *final_wd2.mod *models as input to
> the *evolve_both_stars *directory in the binary module of MESA.
>
> 3) In evolve_both_star directory, I modified the *inlist_project *to
> provide the desired orbital period.
>
> 4) The evolution starts; however, after an evolution of ~ 4.33d5 years,
> the simulation terminated, showing:
>
> terminated evolution: cannot find acceptable model
> termination code: min_timestep_limit
> terminated evolution: cannot find acceptable model
> termination code: min_timestep_limit
> DATE: 2024-01-08
> TIME: 11:06:22
> finished
>
> 5) At the time of termination, the mass transfer rate is too minute (10^-8
> M_sun/yr) to be called a merger (please see the attached PNG file for
> details)!
>
>
> I shall be highly thankful for any suggestion to simulate the merger
> event. I am using MESA-r23.05.1 version with the corresponding MESASDK.
>
> With best regards,
> Amar
> _______________________________________________
> mesa-users at lists.mesastar.org
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