[mesa-users] nova outburst

[Bill Wolf]

Hi Haliang,

I didn't run your model, but I suspect the first problem you're running
into is shocking the WD with a relatively rapid mass change (0 -> 1e-8
Msun/yr). Additionally, if you truly have a naked WD, transitioning
instantaneously from a C/O composition at the surface to a solar
composition material dramatically changes the structure and opacity near
the surface.

Try first accreting at a low (say, 1e-10) rate for ~100 years, then use the
relax_mass_change controls to ramp things up to your desired rate. Other
possibly useful suggestions for geting multi-cycle novae related to my nova
paper are found here:
http://mesastar.org/results/hydrogen-burning-on-accreting-white-dwarfs-stability-recurrent-novae-and-the-post-nova-supersoft-phase/technical-details.
Getting novae to work in MESA has changed a bit since I wrote that, so you
are likely to run into more challenges during mass loss.

Good luck!

Regards,

Bill

On Wed, Oct 19, 2016 at 7:28 AM, chenhl <chlcrazyboy at gmail.com> wrote:

> Dear all,
>
> I am trying to use MESA to construct multicycle nova outburst.
>
> First, I made a naked CO WD without H/He shell on its
> surface. Then I used wd2 test suite case and the naked WD model to simulate
> the nova outburst. But the code stop running after several hundred models.
> Because the timestep in the calculation is becoming smaller and smaller. At this
> point, the WD does not accrete enough mass to ignite the H shell.
> I have tried to use different naked WD models and some control parameters,
> but it still doesn't work.
>
> In the mailing list archives, there is a similar question but without answers.
>  https://sourceforge.net/p/mesa/mailman/message/25662136/
>
> If anyone has experience with this, I would appreciate it if you can give me
> some suggestion. Thanks in advance.
>
> Attached are the inlist file, WD model and output information of the
> calculation. The MESA version is 4906.
>
> Best wishes,
>
> Hailiang Chen
>
>
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