[Mesa-users] Any tips on making a brown dwarf?

[Earl Bellinger]

Hi Josiah, thanks for the tips.

Since this was "just for fun", and in the spirit of giving back to MESA,
here are the results of the calculations.

Attached are diagrams showing the minimum mass at which a star is able to
obtain at least 90% of its luminosity from nuclear reactions.

In case this is ever useful for anyone, the calculations are online here:
https://github.com/earlbellinger/min-mass

Best regards,
Earl


On Mon, Nov 19, 2018 at 5:00 PM Josiah Schwab <jwschwab at ucsc.edu> wrote:

> Hi Earl,
>
> I've definitely seen some difficulties with low mass models in very early
> stages.  I think this usually reflects being a weird part of the
> EOS/opacity parameter space.
>
> Giving the solver more room to thrash about before giving up seems to let
> things run.  Having the the options
>
>    max_resid_jump_limit = 1d12
>    max_corr_jump_limit = 1d12
>
> in my inlist seems to help things.  You shouldn't need them any more after
> ~Myr.  It just helps getting things started.
>
> The defaults for those values have gotten tighter over the years, which is
> why BDs were often slightly "easier" out of the box in the past.
>
> I think Bill was just taking a look at this scenario recently in hopes of
> make things run more smoothly and adding a little more guidance to the test
> suite for BDs.
>
> Josiah
>
>
>
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20181120/f897a1f0/attachment.html>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: T_c.pdf
Type: application/pdf
Size: 281538 bytes
Desc: not available
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20181120/f897a1f0/attachment.pdf>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: rho_c.pdf
Type: application/pdf
Size: 278882 bytes
Desc: not available
URL: <https://lists.mesastar.org/pipermail/mesa-users/attachments/20181120/f897a1f0/attachment-0001.pdf>