[Mesa-users] Creating a Highly Irradiated Super-Earth

[Falk Herwig]

Brian, 
a convenient way to run previous versions of MESA (back to v4942) is NuDocker, a docker environment for MESA. 

https://github.com/NuGrid/NuDocker

Falk

> On Jan 24, 2020, at 4:09 PM, Brian Jackson <bjackson at boisestate.edu> wrote:
> 
> Is it possible to revert to a version of MESA that could successfully
> navigate these calculations? I see that Chen & Rogers (2016) used
> version 7623 to model highly irradiated super-Earths. I was also able
> to use an earlier version to do similar calculations.
> 
> I know that I can download earlier MESA versions, but the earlier
> versions of the SDKs do not appear to be available. Any suggestions?
> 
> Thanks,
> Brian
> 
> On Fri, Jan 24, 2020 at 2:41 PM Brian Jackson <bjackson at boisestate.edu> wrote:
>> 
>> It's actually reassuring. At least I wasn't goofing something up. I'll
>> figure out some science workaround.
>> 
>> Thanks very much for the quick response,
>> Brian
>> 
>> On Fri, Jan 24, 2020 at 2:37 PM Bill Paxton <paxton at kitp.ucsb.edu> wrote:
>>> 
>>> this is definitely running into EOS problems.  (negative gamma1 -> imaginary sound speed)
>>> 
>>> it may well be related to a blending glitch combining OPAL eos and PC eos.
>>> 
>>> the solution is not likely to be trivial, so don’t hold your breath.
>>> 
>>> we’ll work on it, but it may take some significant time to fix.
>>> 
>>> sorry for the disappointing news.
>>> 
>>> b
>>> 
>>> 
>>> 
>>> 
>>> 
>>>> On Jan 24, 2020, at 11:53 AM, Brian Jackson <bjackson at boisestate.edu> wrote:
>>>> 
>>>> I've conducted additional experiments, and I think I'm starting to see
>>>> what the issues might be.
>>>> 
>>>> I've attached inlists and a model for a slightly different approach.
>>>> The model calculation behaves fine until about 4 Gyrs out, when the
>>>> timestep suddenly plunges and the code fails to complete the run. For
>>>> some reason, the central degeneracy parameter goes haywire shortly
>>>> before the run ends -- see attached History_Plot.png.
>>>> 
>>>> Looking at the 2011 MESA instrument
>>>> (https://ui.adsabs.harvard.edu/abs/2011ApJS..192....3P/abstract), it
>>>> seems the model core may be nearing a transition in the equation of
>>>> state (log(density) = -0.19, log(temp) = 3.79 -- see attached Figure
>>>> 1). Is there a reason why that transition would severely and abruptly
>>>> modify the degeneracy parameter? Is there a way to smooth this
>>>> evolutionary phase?
>>>> 
>>>> Or have I completely misunderstood what's going on?
>>>> 
>>>> Thanks,
>>>> Brian
>>>> 
>>>> On Wed, Jan 22, 2020 at 5:58 PM Brian Jackson <bjackson at boisestate.edu> wrote:
>>>>> 
>>>>> Dear MESA Users,
>>>>> I am still struggling to create highly-irradiated super-Earths using MESA.
>>>>> 
>>>>> I have attached the inlists and saved models I'm using to create a
>>>>> 20-Earth mass planet with an envelope mass fraction of 20% (i.e., a
>>>>> core mass of 16 Earth masses) and an irradiation 20 times Earth's
>>>>> (i.e., 2.72e7 ergs/s/cm^2).
>>>>> 
>>>>> I attempt to create the planet by irradiating a gas giant planet and
>>>>> then relaxing the mass down to my desired mass. (I've found doing it
>>>>> the other way around leads to badness.) I've tried tweaking lots of
>>>>> settings, but nothing seems to work. In the end, I wind up with a
>>>>> timestep below the suggested minimum of 9.9999999999999995D-07.
>>>>> 
>>>>> I am using Mac OS 10.13.1, MESA 11701, and the most recent version of
>>>>> the SDK (August 30 2019).
>>>>> 
>>>>> Please forgive me if I forgot any required information.
>>>>> 
>>>>> Thanks,
>>>>> Brian
>>>> <inlist><inlist_pgstar><history_columns.list><LF14_planet_relaxedM_20_ME_10-percent.mod><Paxton2011_Fig1.png><History_Plot.png>_______________________________________________
>>>> mesa-users at lists.mesastar.org
>>>> https://lists.mesastar.org/mailman/listinfo/mesa-users
>>>> 
>>> 
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> 

--
Falk Herwig
Dept of Physics & Astronomy, U of Victoria
fherwig at uvic.ca, tel: +1 (250) 721-7743