[Mesa-users] ppisn: neutrino luminosity as a threshold for turning on Riemann solver

[Pablo Marchant]

And just as a quick comment, many of those options that regulate the
turning on/off of hydro in the ppisn test case have evolved to attempt to
make the test as reliable as possible. In my experience at least, shifting
the threshold for neutrino luminosity too high can cause problems in pulses
after the first one, where the star can be very bloated owing to the energy
injection in the first pulse. Without hydro, the envelope of the model can
struggle and drive timesteps down.

Still, would be pretty interesting for someone to study more in detail how
much these numerical options affect the outcome. I did a few tests and did
not find significant differences, other than a varying reliability of the
models. But still, I never studied it systematically.

Cheers

On Thu, May 6, 2021 at 6:58 PM Francis Timmes via Mesa-users <
mesa-users at lists.mesastar.org> wrote:

> dear jing-ze,
>
> this is an excellent experiment for you to run!
> then you'll be able to quantify the differences.
>
> fxt
>
>
>
>
>
> > On May 5, 2021, at 10:38 PM, Jing-Ze Ma via Mesa-users <
> mesa-users at lists.mesastar.org> wrote:
> >
> > Hi everyone,
> >
> > I've been experimenting with the ppisn test_suite. I noticed that the
> Riemann solver will be turned on when neutrino luminosity reaches a certain
> value before dynamical instability. In Merchant 2019 paper it's set to be
> 10d0 (10^10 solar luminosity), whereas in the test_suite it's 9d0. If I
> want to delay the turning on of Riemann solver and set this value to be
> 12d0, will the results be much different (e.g., give very different BH
> masses or make a PPISN event become a direct iron core collapse)?
> >
> > Thank you in advance.
> >
> > Cheers,
> > Jing-Ze
> >
> >
> > --
> > Jing-Ze Ma
> > Undergraduate Student,
> > Tsinghua University
> >
> > _______________________________________________
> > mesa-users at lists.mesastar.org
> > https://lists.mesastar.org/mailman/listinfo/mesa-users
> >
>
> _______________________________________________
> mesa-users at lists.mesastar.org
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>

-- 
Pablo Marchant Campos
M.Sc on Astrophysics, Universidad Católica de Chile
PhD on Astrophysics, Argelander-Institut für Astronomie, Universität Bonn
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